Large neodymium magnets: screen duty, then validate the design.
Run a rule-based duty screen, then use the RFQ guide to validate geometry, holding force, handling, coating, and shipment. This screen does not size magnets.
Published 2026/03/07 · Updated 2026/10/17
1) Large neodymium magnets duty-fit screen
Enter duty and sourcing assumptions to get a rule-based route screen and RFQ actions. This tool does not use part dimensions, calculate magnetic-circuit performance or pull force, or qualify a lifting assembly or air shipment.
No result yet
Run the duty screen to generate a preliminary rule-based duty category, boundary notes, and the next RFQ evidence checklist.
The output includes suitability boundaries and a fallback route when NdFeB is not a safe primary lane.
Hypothetical inputs and editorial guidance only—not a customer case, physical test, supplier result, or output from the live tool. No magnet was measured for this example.
Reference run for large neodymium magnets: lifting-assist fixture module using 100 x 40 x 20 mm blocks with humid washdown exposure and mixed air/surface launch shipments.
- Target flux density: 900 mT
- Max operating temp: 98C
- Peak temp: 126C
- Corrosion exposure: Humid with periodic alkaline cleaning
- Shape complexity: Standard large block with edge-contact surfaces
- Compliance lane: Industrial-only with export shipments
- Shipment lane: Mixed air + surface lanes
- Channel scope: Industrial-only distribution plan
Illustrative interpretation: The illustrative rule-screen interpretation is "Conditional fit": large sintered NdFeB remains a candidate, while handling, edge protection, package-field checks, and temperature validation remain open. This category does not estimate size or holding force and does not qualify a lifting assembly or shipment.
Why this matters: Large-magnet programs can satisfy nominal force targets yet still fail on handling, coating, or shipment controls. This run keeps those release gates explicit before PO approval.
2) Report summary (decision-ready conclusions)
These cards summarize the key decisions, core numbers, and applicability boundaries so teams can align quickly.
Run tool
Deterministic 0-100 duty-screen score from fixed rule penalties; not a probability, magnetic or lifting qualification, pull-force estimate, or release approval.
Pending result
Adjusted value includes environment, geometry, and compliance penalties before class mapping.
Pending result
Uses max(adjusted peak, adjusted operating + 8C) so sustained-duty risk is not hidden by transient-only checks.
28-54 MGOe (Arnold grade reference)
Source: [S116]. This supplier catalog range is not a universal working limit; usable output depends on grade, load line, geometry, and temperature.
35%-40% N-1 coverage
Source: [S4], 2035 shock scenario for graphite + rare earth elements. Use contingency lanes before RFQ freeze.
100% U.S. net reliance (2025)
Source: [S2] heavy rare earth chapter. High-temperature programs should disclose Dy/Tb exposure assumptions.
Device-specific safeguards above 20 kg SWL
Source: [S75]. Confirm power-supply type, device standard, and applicable HSE safeguards with the supplier; do not apply one warning/hold rule to every lifting magnet.
0.5 mT implant risk / 3 mT projectile risk
Source: [S76]. Shipment compliance and workplace zoning are separate gates for large-magnet programs.
Legacy KIC about 2.5-5.5 MPa m^1/2
Source: [S77]. Treat this as a conservative risk anchor; production handling still needs project-level impact validation.
- Engineering teams defining first-pass material lanes before RFQ.
- Procurement teams that need explicit evidence gates before supplier ranking.
- Programs balancing compact size requirements with thermal and corrosion boundaries.
- Teams expecting universal grade answers without duty-cycle evidence.
- Projects that cannot execute minimum thermal/corrosion validation.
- Cost-only sourcing workflows with no fallback lane definition.
3) Key numbers and scope boundaries
Numeric claims are disclosed with date markers. Unknown or uncertain items are explicitly labeled to avoid false certainty.
| Metric | Value | Date marker | Decision implication | Source ref |
|---|---|---|---|---|
| U.S. rare-earth concentrate output (REO) | 51,000 t and USD 240M | USGS MCS 2026 chapter, published 2026-02 | Shows domestic output scale but not full self-sufficiency for downstream NdFeB supply chains. | [S1] |
| U.S. imports of RE compounds/metals | +169% volume in 2025; value USD 165M vs USD 168M in 2024 | USGS MCS 2026 chapter, published 2026-02 | Procurement risk is driven by product mix and category shifts, not only by headline import value. | [S1] |
| World rare-earth production estimate | 390,000 t in 2025 | USGS MCS 2026 foreword (published 2026-02) | Global supply expanded, but growth does not remove concentration and policy-shock exposure. | [S3] |
| Heavy rare-earth net import reliance (U.S.) | 100% in 2025 (compounds and metals) | USGS MCS 2026 heavy rare earths chapter, published 2026-02 | High-temperature NdFeB lanes can inherit geopolitical and licensing risks through Dy/Tb exposure. | [S2] |
| Rare-earth demand change in STEPS | +50% to +60% by 2040 | IEA Global Critical Minerals Outlook 2025 | Even moderate scenario growth keeps pressure on magnet-material qualification and sourcing plans. | [S4] |
| China projected refining share (battery-grade graphite + rare earths) | Around 80% in 2035 | IEA Global Critical Minerals Outlook 2025 | Dual-lane sourcing should start before RFQ freeze for high-risk temperature classes. | [S4] |
| N-1 supply coverage for graphite + rare earths | Only 35% to 40% of N-1 demand in 2035 | IEA Global Critical Minerals Outlook 2025 | Single-country disruption can invalidate otherwise "balanced" supply assumptions. | [S4] |
| Salt spray as field-life predictor | Seldom correlates when used as stand-alone data | ASTM B117-26, last updated 2026-01-19 | Do not convert fog-test hours directly into service-life commitments without corroborating evidence. | [S10] |
| U.S. net import reliance (RE compounds/metals) | About 67% in 2025 (down from >90% in 2024) | USGS MCS 2026 Rare Earths chapter, published 2026-02 | Dependence improved versus 2024, but import exposure remains high enough to require dual-lane planning. | [S14] |
| U.S. apparent consumption (RE compounds/metals) | 27,000 t REO in 2025 vs 9,010 t in 2024 | USGS MCS 2026 Rare Earths chapter, published 2026-02 | Demand rebound can compress lead-time buffers if RFQ and validation gating are delayed. | [S14] |
| China share of U.S. RE imports by value | Average 71% (2021-2024) | USGS MCS 2026 Rare Earths chapter, published 2026-02 | Country concentration remains material for NdFeB programs even when domestic mine output increases. | [S14] |
| Rare-earth oxide price dispersion (2025, China market) | NdPr +25% ($55->69/kg), Tb +24% ($812->1,010/kg), Dy -7% ($257->239/kg) | USGS MCS 2026 Rare Earths + Heavy Rare Earths chapters | Do not treat heavy-RE exposure as one blended surcharge; element-specific terms are safer for contracts. | [S14][S15] |
| Chinese permanent-magnet exports | About 58,000 t in 2024 | IEA commentary on export controls, published 2025-12-04 | Short approval delays can rapidly affect downstream inventories when market dependence is high. | [S16] |
| EU strategic benchmark package (CRMA) | 2030 targets: 10% extraction, 40% processing, 25% recycling, <=65% single-country dependency | Regulation (EU) 2024/1252, effective 2024-05-23 | EU-facing RFQs should include origin traceability and recycling disclosure gates before final award. | [S12] |
| Air carriage magnetic-field limit (U.S.) | >0.00525 gauss at 4.5 m from any package surface is forbidden | FAA PackSafe page last updated 2023-03-15; eCFR current to 2026-03-19 | Technical fit alone does not guarantee ship readiness; package-field checks must be part of launch gating. | [S19] |
| U.S. consumer magnet hazard threshold | Hazard criteria include small-part fit plus flux index >=50 kG2 mm2; subject products must stay below 50 | 16 CFR part 1262 current text, accessed 2026-02-19 | Consumer-facing loose-magnet products need compliance screening before using catalog strength claims in go-to-market plans. | [S20] |
| U.S. high-powered magnet injury baseline | Estimated 26,600 emergency-department visits (2010-2021) and 7 reported deaths | 16 CFR part 1262 findings and CPSC final-rule release (2022) | If magnets can become loose parts, safety risk can dominate material-choice logic even when force targets are met. | [S20][S21] |
| Rare-earth demand vs secondary supply (2024, STEPS) | 91 kt demand vs 27 kt secondary supply (~30%, inferred) | IEA rare-earth data page, updated 2025-05-21 | Secondary supply helps but does not replace primary extraction and refining resilience planning. | [S22] |
| Top-three concentration (2024, STEPS) | Mining 86%; refining 97% | IEA rare-earth data page, updated 2025-05-21 | Supplier-count diversification can still mask concentration risk if upstream refining remains highly clustered. | [S22] |
| HSE magnetic-lifting safeguards for devices above 20 kg SWL | For battery-fed devices (excluding permanent/electro-permanent types), warn at least 10 min before release-level and prevent restart until recharged. For externally powered devices, warn on supply failure and provide standby power to hold the SWL for at least 10 min. HSE frames these safeguards for equipment not to the current BS EN 13155 standard, where reasonably practicable. | UK HSE magnetic lifting devices guidance, accessed 2026-10-17 | Confirm device type, applicable standard, and local requirements with the lifting-equipment supplier; record the safeguards and risk assessment that apply to the actual setup. | [S75] |
| Static-field action levels for workers at particular risk | 0.5 mT for active implanted-device interference risk and 3 mT for ferromagnetic projectile risk | Directive 2013/35/EU Annex II consolidated text, accessed 2026-10-17 | A package can pass shipment checks but still require workplace zoning and access controls near large magnets. | [S76] |
| Static-field exposure limit values (EU Directive Annex II) | 2 T sensory-effects ELV for normal work; 8 T for localized limb exposure. The controlled health-effects ELV is 8 T. | Directive 2013/35/EU Annex II consolidated text, accessed 2026-10-17 | These are exposure limit values, not device-specific clearance distances; apply the relevant national rules and site risk assessment to measured field maps. | [S76] |
| Nd2Fe14B fracture-toughness signal (legacy lab dataset) | KIC about 2.5-5.5 MPa m^1/2 | Materials Transactions 37(4):860-863, published 1996 | Large blocks can chip under impact; edge protection and drop-control gates should be release prerequisites. | [S77] |
| Ferrous-load temperature boundary for magnetic lifting | Guidance notes ferrous materials cease being magnetic at about 700C | UK HSE magnetic lifting devices guidance, accessed 2026-10-17 | Hot-work transfer routes need explicit temperature checks and non-magnetic fallback handling plans. | [S75] |
Note: Grade suffix windows shown here are supplier planning conventions. Final qualification always depends on measured magnetic curves, thermal reserve checks, and application-specific validation.
Evidence snapshot checked on Foundational refs [S12]-[S22] refreshed on 2026-03-07; large-format safety refs [S75]-[S78] checked on 2026-10-17..
Share your duty profile, shipment lane, and channel assumptions. We will return an RFQ-ready action list with fallback triggers.
3.5) Policy and compliance trigger matrix (neodymium route)
This section adds time-bound regulatory and market triggers that materially change NdFeB procurement decisions for EU-facing and globally exposed programs.
| Trigger | What changed | Timing | Sourcing impact | Minimum action | Source ref |
|---|---|---|---|---|---|
| EU strategic benchmark gate (CRMA Article 5) | EU defines 2030 targets: >=10% extraction, >=40% processing, >=25% recycling, and <=65% single-country dependency. | Regulation in force since 2024-05-23; benchmark horizon is 2030. | EU-bound programs need upstream origin transparency and backup processing lanes earlier in the RFQ cycle. | Request country-of-processing disclosure and contingency sources before price-only negotiations. | [S12] |
| Permanent-magnet label and digital data carrier (CRMA Article 28) | EUR-Lex Corrigendum (EU) 2024/90330 corrected the Article 28(2) implementing-act deadline from 2026-11-24 to 2025-11-24. | The corrected deadline has passed. Article 28 label/data-carrier duties apply two years after the implementing act enters into force; confirm its current status in the Official Journal. | A missed act deadline and unknown publication status make label-format and go-live assumptions unreliable for EU programs. | Check the current Article 28 implementing act and its entry-into-force date before setting packaging, data-carrier, or compliance milestones. | [S13][S119] |
| Recycled-content statement for magnets (CRMA Article 29) | The CRMA covers products with more than 0.2 kg of specified permanent magnets. The original deadline for the calculation/verification method has passed; proposed Article 29 amendments are not enacted law. | The original delegated-method deadline was 2026-05-24. The disclosure date in the original text is 2027-05-24 or two years after the delegated act enters into force, whichever is later; verify current enacted text before relying on either date. | Supplier recycled-content declarations may use non-comparable methods while the enacted calculation and verification method remains to be confirmed. | Keep declarations provisional and check the current delegated act and Official Journal before using an EU compliance timeline. | [S13][S118] |
| 2025 export-control disruption window | IEA reports licensing restrictions and approval bottlenecks after China export-control tightening in 2025. | Controls announced 2025-04 and extended by 2025-10; approvals remained constrained through 2025-11. | Single-lane NdFeB sourcing can face abrupt lead-time shocks even when nominal capacity exists. | Define trigger-based switch rules (lead time, surcharge, and element exposure) before final supplier award. | [S15][S16] |
| Corrosion test comparability gate | ISO 9227 and IEC 60068-2-11 define controlled salt-mist methods, but they remain comparative screening tools rather than direct field-life predictors. | ISO 9227 published 2022-08; IEC 60068-2-11 updated 2021-06-17; ASTM B117 current revision 2026-01-19. | Quote claims based only on fog-test hours can overstate lifecycle confidence across real media and duty cycles. | Require combined corrosion + thermal-cycle validation criteria in RFQ instead of accepting stand-alone salt-spray hours. | [S10][S17][S18] |
| U.S. air-carriage magnetized-material gate | FAA PackSafe and 49 CFR 173.21(d) align on the aircraft carriage limit of >0.00525 gauss at 4.5 m from any package surface. | FAA page last updated 2023-03-15; eCFR current to 2026-03-19. | High-strength packages can require shielding redesign or route changes even after technical material fit is approved. | Add package-field measurement records to logistics release checklists before air-freight booking. | [S19] |
| U.S. consumer loose-magnet safety gate | 16 CFR part 1262 defines hazardous consumer magnet products by small-part fit and flux index threshold; CPSC attributes major injury burden to this category. | Effective since 2022-10-21; current text accessed 2026-02-19. | Consumer-facing SKUs can fail compliance even when engineering pull-force targets are met. | Screen product scope and flux-index risk before tooling and packaging lock for consumer channels. | [S20][S21] |
| Power-failure safeguards for magnetic lifting devices | For devices above 20 kg SWL, HSE describes different safeguards by supply type: battery-fed devices need a pre-release warning and restart lockout; externally powered devices need a supply-failure warning and standby power. These safeguards should be considered for equipment not to the current BS EN 13155 standard where reasonably practicable. | HSE magnetic lifting devices guidance accessed 2026-10-17. | Large-fixture launches can slip if fail-safe behavior is not engineered and validated before pilot release. | Ask the supplier to identify device type and applicable standard, document the safeguards that apply, and include the setup-specific risk assessment and emergency-response SOP in acceptance records. | [S75] |
| Workplace static-field zoning gate for at-risk workers | EU Annex II sets static-field action levels for workers at particular risk (0.5 mT for active implants and 3 mT for ferromagnetic projectile risk). | Directive 2013/35/EU consolidated text accessed 2026-10-17. | Large-magnet programs can pass shipment checks but still fail workplace safety readiness without field-zoning controls. | Add measured field maps, implant-risk zones, and ferromagnetic-tool control rules before SOP lock. | [S76] |
| Implanted-device interference communication baseline | FDA recommends a 6-inch (15 cm) separation for the consumer electronics discussed on its page; this is not a validated safe distance for industrial large-magnet assemblies. | FDA page published 2021-05-13; accessed 2026-10-17. | Service manuals and operator training for large magnets need explicit standoff messaging where people may be exposed. | Use measured field maps, applicable workplace rules, and implant-specific guidance to set controls; do not reuse the 15 cm consumer-electronics distance as an industrial clearance value. | [S78] |
| Pending item | Current status | Impact | Minimum action | Source ref |
|---|---|---|---|---|
| CRMA Article 28 magnet-label implementation template | EUR-Lex Corrigendum (EU) 2024/90330 corrected the Article 28(2) implementing-act deadline to 2025-11-24; that date has passed. This review has not confirmed whether a final implementing act has since been adopted, so verify its current status and entry-into-force date in the Official Journal before using a go-live timeline. | Packaging, label, and data-carrier timing cannot be planned from the original uncorrected date or from a proposal that has not become law. | Confirm the current Article 28 implementing act and its entry-into-force date; label and data-carrier duties start on the applicable two-year trigger. | [S119][S118] |
| CRMA Article 29 recycled-content calculation method | Regulation (EU) 2024/1252 set 2026-05-24 as the deadline for a delegated method; that date has passed. The Commission proposal to amend Article 29 remains an ongoing legislative procedure (checked 2026-10-17), so the proposal is not enacted law and the final method/timing must be rechecked in the delegated-act register and Official Journal. | An overdue method and a pending amendment can change the evidence and timing expected for EU recycled-content claims. | Before using a compliance timeline, verify the latest delegated act and enacted CRMA text; keep recycled-content calculations provisional until the method and applicable date are confirmed. | [S13][S118] |
| Part-level Dy/Tb intensity for specific commercial grades | No reliable public open dataset; supplier formulas are typically confidential and program-specific. | Element-specific price and export-license exposure can remain hidden until late quote revisions. | Use NDA-backed composition range disclosure and element-indexed surcharge clauses before committing long-horizon POs. | [S15] |
| Carrier-specific acceptance workflow for magnetized packages | No single reliable public cross-carrier template; regulatory thresholds are clear but acceptance workflows vary by route and operator. | Programs can hit late booking friction even after in-house technical and compliance reviews pass. | Collect route-specific carrier checklists and sample package-field evidence before ramp milestones. | [S19] |
| Cross-site conversion from static-field limits to safe standoff maps | No reliable public universal calculator maps every large-magnet geometry and orientation to guaranteed 0.5 mT or 3 mT workplace zones. The FDA consumer-electronics 15 cm advice is not such a calculator. | Global programs can over-assume zone portability and miss site-specific implant-risk or projectile-risk controls. | Keep site-level EMF risk assessments and measured field-map approvals as mandatory transfer gates for each plant. | [S76][S78] |
| Public pass/fail benchmark for chip risk under real handling routes | No reliable public cross-supplier benchmark links NdFeB toughness ranges to production-scale chip/crack incidence for large blocks. | Incoming-QC and handling plans can look complete but still miss hidden scrap/safety risk during ramp-up. | Capture pilot handling defect rates and convert them into explicit edge-protection and packaging acceptance limits. | [S77] |
Article 28 and Article 29 status checked 2026-10-17. Verify the current enacted text and Official Journal before relying on an implementation date.
4) Methodology
The method combines technical feasibility and sourcing execution in one path so output can directly drive next actions.
Step 1 - Convert max and peak temperatures into planning duty
For this neodymium magnets route, the tool adjusts both max operating and peak temperatures, then applies an 8C planning guard band on sustained duty.
Step 2 - Gate against thermal class and flux demand
Planning duty maps to N/AH planning windows while requested flux density screens for sintered, bonded, or fallback routes.
Step 3 - Add coating and validation burden
Corrosion exposure determines coating stack and required validation evidence before RFQ lock.
Step 4 - Produce action path with confidence
The output reports confidence, risk rows, and next actions so teams can move directly into RFQ or fallback planning.
Step 5 - Add large-format handling, zoning, and fail-safe gates
For large neodymium routes, the method appends lifting-device fail-safe checks, workplace field-zoning controls, and edge-impact handling validation before RFQ lock.
5) Data sources and evidence trail
Every key conclusion maps to a source and date marker so reviewers can validate or challenge assumptions quickly.
| Ref | Source | Signal used on this page | Date marker |
|---|---|---|---|
| S1 | USGS MCS 2026 - Rare Earths chapter | Reports U.S. REO concentrate output (51,000 t, USD 240M) and import shift (+169% volume; value USD 165M vs USD 168M in 2024). | Published 2026-02 |
| S2 | USGS MCS 2026 - Heavy Rare Earths chapter | Shows U.S. net import reliance at 100% in 2025 and documents 2025 export-control timeline affecting heavy rare earths. | Published 2026-02 |
| S3 | USGS Mineral Commodity Summaries 2026 (foreword) | States world rare-earth production estimate reached 390,000 tons in 2025. | Manuscript approved 2026-02-06 |
| S4 | IEA Global Critical Minerals Outlook 2025 | Rare-earth demand rises 50%-60% by 2040 in STEPS; China around 80% refining share in 2035; N-1 coverage for graphite + rare earths only 35%-40%. | Published 2025 |
| S5 | DOE Critical Materials Assessment 2023 | Executive summary states Nd, Pr, Dy, Tb used in EV motor and wind generator magnets continue to be critical. | Published 2023-07-31 |
| S6 | IEC 60404-5:2015 | Defines measurement methods for magnetic flux density, polarization, field strength, demagnetization curve, and recoil line for permanent magnets. | Publication date 2015-04-16 |
| S7 | IEC 60404-8-1:2023 | Specifies minimum magnetic-property values and dimensional tolerances for magnetically hard materials, including updated REFeB grades. | Publication date 2023-09-20 |
| S8 | IEC 60404-18:2025 | Defines open-circuit superconducting-magnet methods (SCM-VSM and SCM-extraction) and self-demagnetizing-field corrections. | Publication date 2025-02-20 |
| S9 | IEC TR 62518:2009 | Details flux-loss behavior of Nd-Fe-B and SmCo sintered magnets from 50C to 200C for up to 1000 h; explicitly excludes corrosion-coupled stability modeling. | Publication date 2009-03-17 |
| S10 | ASTM B117-26 | Defines salt-spray apparatus as a controlled comparative test and warns that stand-alone correlation to natural environment is seldom reliable. | Last updated 2026-01-19 |
| S11 | Review paper on bonded NdFeB (Journal of Alloys and Compounds 2025) | Notes isotropic bonded NdFeB is often <=16 MGOe while anisotropic bonded routes can approach ~25 MGOe. | Published 2025-07-15 |
| S116 | Arnold Magnetic Technologies - NdFeB grade property table | Lists typical BHmax values from 28 MGOe for N28AH through 54 MGOe for N55; these are supplier grade data, not universal usable-energy limits. | Product page accessed 2026-10-15 |
| S117 | Arnold Magnetic Technologies - RECOMA SmCo grades and properties | Lists standard RECOMA grades from 18 to 35E and typical BHmax values from 18 to 33.3 MGOe; actual grade properties and operating limits vary. | Product page accessed 2026-10-15 |
| S12 | Regulation (EU) 2024/1252 (CRMA), Article 5 | Sets 2030 EU benchmarks: >=10% extraction, >=40% processing, >=25% recycling, and <=65% single-country dependency at each strategic stage. | Entered into force 2024-05-23 |
| S13 | Regulation (EU) 2024/1252 (CRMA), Articles 28-29 | Defines permanent-magnet labeling/data-carrier obligations and recycled-content statement requirements for Nd, Dy, Pr, Tb and related elements. | Entered into force 2024-05-23 |
| S14 | USGS MCS 2026 - Rare Earths chapter | Reports U.S. 2025 net import reliance at about 67%, consumption at 27,000 t REO, China import share averaging 71% (2021-2024), and NdPr oxide rising from $55/kg to $69/kg in 2025. | Published 2026-02 |
| S15 | USGS MCS 2026 - Heavy Rare Earths chapter | Documents 2025 export-control timeline for seven medium/heavy rare-earth items; terbium oxide increased from $812/kg to $1,010/kg while dysprosium oxide declined from $257/kg to $239/kg. | Published 2026-02 |
| S16 | IEA commentary: China’s export restrictions and strategic responses | Notes roughly 58,000 t Chinese permanent-magnet exports in 2024 and reports 2025 licensing disruptions affecting downstream inventories. | Published 2025-12-04 |
| S17 | ISO 9227:2022 Corrosion tests in artificial atmospheres | Defines NSS/AASS/CASS test methods and warns that salt-spray performance does not translate directly into corrosion behavior in other environments. | Published 2022-08 |
| S18 | IEC 60068-2-11:2021 Environmental testing - Test Ka | Provides an electrotechnical salt-mist test protocol used for comparative corrosion qualification and test reproducibility. | Published 2021-06-17 |
| S19 | FAA PackSafe magnets page + 49 CFR 173.21(d) | States that any package or magnet above 0.00525 gauss at 4.5 m (15 feet) from any package surface cannot fly and points to the codified DOT rule. | FAA page last updated 2023-03-15; accessed 2026-03-22 |
| S20 | eCFR 16 CFR part 1262 - Safety standard for magnets | Defines hazard criteria using small-part fit and flux index >=50 kG2 mm2, with an effective date of 2022-10-21. | Current text (last amended 2023-09-20), accessed 2026-02-19 |
| S21 | CPSC final-rule release for magnet safety | Reports estimated 26,600 emergency-department visits (2010-2021) and seven deaths linked to high-powered magnet ingestion incidents. | Published 2022-09-22 |
| S22 | IEA data: Rare earth elements supply, demand, diversification and policy support | Shows 2024 STEPS values of 91 kt demand, 27 kt secondary supply, and top-three concentration of 86% (mining) and 97% (refining). | Updated 2025-05-21 |
| S118 | European Parliament Legislative Observatory - procedure 2025/0385(COD) | As of 2026-10-16, the Commission proposal to amend Regulation (EU) 2024/1252 remained ongoing and was awaiting Parliament’s first-reading position. A committee report was tabled on 2026-10-09; the proposed changes were not enacted law. | Procedure status checked 2026-10-17 |
| S119 | EUR-Lex Corrigendum (EU) 2024/90330 to Regulation (EU) 2024/1252 | Corrects the CRMA Article 28(2) implementing-act deadline from 24 November 2026 to 24 November 2025. | Published 2024-06-03; checked 2026-10-17 |
| S75 | UK HSE: Magnetic lifting devices safety guidance | Explains task-specific selection and risk assessment. For devices above 20 kg SWL, it describes different battery-fed and externally powered safeguards, to be considered for equipment not to the current BS EN 13155 standard where reasonably practicable. | Guidance page accessed 2026-10-17 |
| S76 | Directive 2013/35/EU Annex II (electromagnetic field action levels and ELVs) | Lists static-field action levels for workers at particular risk (0.5 mT for active implant interference and 3 mT for projectile risk), plus sensory-effects ELVs of 2 T for normal work and 8 T for localized limb exposure; controlled health-effects ELV is 8 T. | Consolidated EUR-Lex text accessed 2026-10-17 |
| S77 | Horton et al., Materials Transactions 37(4): Fracture Toughness of Nd2Fe14B Magnets | Reports legacy laboratory fracture-toughness ranges for Nd2Fe14B (KIC about 2.5-5.5 MPa m^1/2), supporting conservative handling assumptions for large blocks. | Published 1996 |
| S78 | FDA communication on consumer electronics with magnets and implanted medical devices | For the consumer electronics discussed on the page, FDA recommends keeping devices with strong magnets at least 6 inches (15 cm) from implanted medical devices. This is not a validated clearance distance for industrial magnet assemblies. | Published 2021-05-13; page accessed 2026-10-17 |
Large neodymium magnets foundational refs [S12]-[S22] refreshed on 2026-03-07; large-format safety refs [S75]-[S78] checked on 2026-10-17.
6) Concept boundaries and applicability rules
These boundaries are used to prevent over-interpretation of catalog labels and to define where additional evidence is mandatory.
| Boundary | Meaning | Use when | Do not use when | Source ref |
|---|---|---|---|---|
| BHmax headline is not assembly force | Energy-product labels compare material potential, not guaranteed pull force in your magnetic circuit. | Use BHmax as first-pass screening with geometry and load-line assumptions declared. | Do not rank suppliers by BHmax alone when measurement method or working point is undisclosed. | [S6][S7][S8] |
| Grade suffix is a planning shortcut | N/M/H/SH/UH/EH/AH ranges are commonly used in commerce but are not a standalone release criterion. | Use suffix classes for early lane gating before detailed BH-curve and demag checks. | Do not treat suffix labels as universal guarantees across vendors without material test disclosure. | [S6][S7] |
| Salt spray is comparative, not life prediction | Salt-fog testing helps compare coating options in controlled chambers. | Use as a screening gate with replication and clear acceptance criteria. | Do not map salt-spray hours directly to field-life commitments without corroborating long-term exposure data. | [S10] |
| High-temperature NdFeB can raise heavy-RE exposure | Programs near EH/AH lanes can become more sensitive to Dy/Tb availability and export controls. | Trigger dual-lane sourcing and fallback windows before RFQ lock when adjusted peak duty is high. | Do not assume global supply expansion alone removes element-specific licensing or concentration risks. | [S2][S4][S5] |
| Thermal stability data has defined scope | Published stability studies include specific time/temperature windows and may exclude corrosion-coupled behavior. | Use the tested windows (for example 50C to 200C, up to 1000 h) as boundary references only. | Do not extrapolate beyond reported conditions without additional testing for corrosion, duty cycling, and geometry effects. | [S9] |
| Air-shipment eligibility is package-level | Air transport screening uses measured package field at distance, not grade labels or nominal BHmax claims. | Apply before booking aircraft lanes for strong assemblies, kits, or mixed shipments. | Do not assume a magnet is flyable because the material passes engineering performance targets. | [S19] |
| Consumer magnet safety scope is conditional | U.S. 16 CFR part 1262 addresses consumer products containing hazardous loose magnets defined by size and flux index. | Use when end products can release accessible loose magnets in consumer channels. | Do not overgeneralize as a universal industrial exemption; verify product scope and exemptions first. | [S20][S21] |
| Shipment-safe field and worker-safe field are different gates | Air-carriage package thresholds and workplace static-field action levels are measured for different risks and cannot replace each other. | Use when large-magnet programs move from transport qualification into assembly, maintenance, or service areas. | Do not treat package-level transport pass evidence as proof that implant-risk or projectile-risk workplace zoning is complete. | [S19][S76] |
| Large magnetic lifting setups are task-specific, not universal | HSE guidance warns permanent magnetic lifting devices are not general-purpose lifting equipment; air gaps, profile changes, and temperature can rapidly reduce hold reliability. | Use when load profile, surface condition, or operating temperature can vary by product family or shift. | Do not copy one validated lifting setup into different steel profiles or hot-work lanes without revalidation and operator controls. | [S75] |
| Legacy fracture numbers are risk anchors, not failure predictors | Published Nd2Fe14B toughness ranges provide brittleness context but do not directly predict chip/crack rates for every geometry and handling route. | Use to justify conservative edge protection, drop prevention, and lot-level handling controls for large blocks. | Do not convert one laboratory toughness range into guaranteed field reliability without project-specific handling validation. | [S77] |
| FDA consumer-electronics standoff advice is not an industrial clearance distance | The cited FDA 6-inch (15 cm) advice addresses consumer electronics with strong magnets. It does not establish a safe workplace distance for large industrial magnet assemblies. | Use the FDA note only as a reminder that magnetic fields can interfere with some implanted devices. | Do not use 15 cm as the exclusion-zone distance for an industrial assembly; use applicable workplace rules, device guidance, and measured site field maps. | [S76][S78] |
7) Material comparison and tradeoffs
Compare material routes using reproducible dimensions instead of marketing-only descriptors.
| Decision dimension | Sintered NdFeB | Bonded NdFeB | SmCo | Comment | Source ref |
|---|---|---|---|---|---|
| Typical magnetic energy density window | 28-54 MGOe in Arnold grade data | <=16 MGOe (isotropic), up to ~25 MGOe (anisotropic) | 18-35 MGOe across Arnold RECOMA grades | Supplier catalog values are grade-specific references; geometry and working point still shift usable output. | [S116][S11][S117] |
| Planning temperature ceiling | Commercial planning classes often run through AH around 220C (verify by curve and load-line) | Typically lower than sintered due to polymer binder constraints | Used as high-temperature fallback; IEC TR 62518 discusses elevated-temperature stability behavior | Use adjusted peak temperature, not ambient. Final limit must come from vendor curves under your duty profile. | [S9] |
| Shape freedom and manufacturing | Strong but brittle; machining tolerance management is critical | Higher shape freedom for complex and thin-wall geometries | Brittle ceramic-like behavior; machining control required | Shape complexity can justify bonded routes even when peak BHmax is lower. | [S11] |
| Corrosion baseline | Coating usually required (Ni-Cu-Ni, epoxy, or equivalent) | Binder contributes baseline protection but media compatibility must still be verified | Better inherent corrosion behavior in many environments | ASTM B117 / IEC 60068-2-11 are gate checks, not direct life models. | [S10] |
| Supply concentration exposure (2035 view) | High for Nd/Pr, and potentially Dy/Tb in high-temperature coercivity lanes | Still tied to rare-earth feedstock plus binder/process dependencies | Different critical-material exposure profile (includes cobalt) | IEA N-1 analysis shows concentration shock can leave only 35%-40% coverage for rare-earth linked chains. | [S4] |
| Measurement comparability baseline | Require demag curve + recoil line under disclosed method | Request the same measurement family and working-point disclosure | Normalize by same method before ranking across vendors | IEC 60404-5 and IEC 60404-18 describe measurement methods; IEC 60404-8-1 defines minimum property specifications. | [S6][S7][S8] |
| Best-fit program conditions | General high-flux motors, sensors, compact electromechanics | Complex geometry, high-volume molding, lower peak flux density demands | Very high-temperature or severe thermal-cycle duty | Always close loop with demag, corrosion, and thermal evidence before release. | [S5][S9] |
| Logistics and consumer-compliance friction | High-field packages can breach air-carriage thresholds; loose consumer magnet formats need explicit safety screening. | Lower energy density can reduce some package-field pressure, but product-level safety checks still apply. | No automatic exemption; package-field and end-use safety scope must still be verified. | Inference from [S11][S19][S20]: compliance is tested at package/product level, not guaranteed by material family alone. | [S11][S19][S20] |
| Large-format handling and release burden | High force density supports compact large fixtures, but brittle behavior and strong attraction demand engineered lifting, spacing, and edge controls. | Lower energy density can reduce single-piece attraction force, but programs often need larger volume or segmentation to hit force targets. | Can help thermal margins, yet handling controls and field-zoning checks remain mandatory for large assemblies. | Use this row as a tradeoff checkpoint: force-only ranking can hide schedule-critical safety tasks and fail-safe validation work. | [S11][S75][S77] |
8) Risk matrix and mitigation
Misuse risk, cost risk, and scenario mismatch risk are shown together so the team can sequence mitigation actions.
| Risk | Probability | Impact | Mitigation |
|---|---|---|---|
| Thermal misclassification versus real hotspot duty | Low | Medium | Recalculate adjusted operating + peak duty with measured cycle data and confirm class with demag-curve checks before PO. |
| Coating-lifecycle mismatch under real media exposure | Medium | Medium | Map media profile to explicit corrosion + thermal-cycle tests and define pass/fail criteria up front. |
| Supplier data non-comparability (test method mismatch) | Medium | High | Require method disclosure (IEC 60404 family) and normalize working points before ranking quotes. |
| High-temperature lane heavy-rare-earth exposure | Medium | Medium | When adjusted duty approaches EH/AH lanes, request Dy/Tb exposure disclosure and define export-control fallback triggers before award. |
| Supply concentration shock during launch window | High | Medium | Maintain contingency lane and pre-define switch triggers for temperature, lead time, and cost tolerance. |
| Air-lane rejection despite technical material fit | High | Medium | Measure shipment-ready package fields before booking, prepare shielding iterations, and pre-authorize a surface-transport fallback workflow. |
| Consumer-channel compliance mismatch | Low | Medium | Before release, confirm whether the SKU enters consumer magnet scope, then align flux-index testing, warnings, and channel restrictions. |
9) Open evidence gaps and minimum closure path
Where public evidence is incomplete, this page does not force a hard conclusion. Each gap includes a minimal executable closure action.
| Evidence gap | Current status | Decision impact | Minimum closure action | Source ref |
|---|---|---|---|---|
| Cross-supplier suffix mapping to guaranteed demag margin | No single public standard mapping N/M/H/SH/UH/EH/AH suffix labels to guaranteed in-application demag reserve. | Quote comparisons can look equivalent while actual thermal headroom differs by method and working point. | Request vendor-specific BH curves, recoil data, and temperature conditions before release decisions. | [S6][S7] |
| Salt-spray hours to field-life conversion | No reliable universal conversion model in open standards; ASTM B117 warns stand-alone correlation is seldom robust. | Warranty and lifecycle assumptions can be overstated if fog-hour data is treated as direct service-life evidence. | Pair chamber tests with application-specific thermal/media cycling and clearly documented acceptance criteria. | [S10] |
| Corrosion-coupled high-temperature flux-loss dataset for each coating stack | Public IEC thermal-stability report excludes corrosion-coupled behavior modeling for full lifecycle prediction. | High-temperature and aggressive-media programs may underestimate long-term drift and reserve loss. | Run combined thermal + corrosion + load-line validation for each candidate stack before final PO. | [S9] |
| Program-specific heavy-rare-earth exposure breakdown | Public macro data confirms concentration risk, but part-level Dy/Tb intensity is typically supplier-confidential. | Lead-time and export-license risk can remain hidden until late sourcing stages. | Add material disclosure checkpoints and contingency triggers in RFQ templates. | [S2][S4] |
| Package-field prediction from CAD/BHmax alone | No reliable universal public model converts part-level grade and geometry into certified package-field outcomes at transport distance. | Teams can discover non-compliant shipping configurations late, after packaging design and launch schedules are locked. | Run measured package-field checks on shipment-ready units and reserve shielding iteration time before booking. | [S19] |
| Universal workplace-zone model for large magnet assemblies | No reliable public model converts all large-assembly geometries into guaranteed 0.5 mT and 3 mT zone distances across layouts, shielding, and orientations. FDA’s 15 cm advice is specific to consumer electronics and does not fill this gap. | Teams can over- or under-size exclusion zones when they rely on simple distance assumptions instead of measured field maps. | Measure field maps on installed assemblies, apply the local exposure rules and implant-specific guidance, then maintain site-specific zone controls with revision tracking. | [S76][S78] |
| Drop-impact to chipping-rate benchmark for large NdFeB blocks | No reliable public cross-supplier dataset links published Nd2Fe14B toughness ranges to real handling-route chip rates by chamfer/coating configuration. | Programs can underestimate scrap and safety risk if they reuse generic brittleness assumptions without pilot handling evidence. | Run pilot handling/drop abuse trials with defect logging and tie findings to packaging/tooling updates before mass release. | [S77] |
Labeling policy: when reliable public data is insufficient, status is marked as "no reliable public data" and converted into a validation task instead of a forced conclusion.
10) Scenario examples
These illustrative planning cases use hypothetical inputs. They are not customer projects, supplier quotes, physical tests, or results from the live tool.
Assumptions
Peak 145C, humid but sealed enclosure, target flux 820 mT, annual volume 120k.
Outcome
Fit: SH/UH sintered NdFeB lane with epoxy-over-Ni coating and standard validation depth.
Next step
Proceed with NdFeB primary lane and run salt-mist + thermal cycle validation before pilot freeze.
Assumptions
Peak 198C, coolant splash exposure, target flux 960 mT, annual volume 45k, automotive compliance.
Outcome
Conditional: EH/AH planning window with tighter demag reserve checks and contingency lane recommendation.
Next step
Open parallel SmCo contingency lane until demag and corrosion evidence both pass program criteria.
Assumptions
Peak 238C, high corrosion medium, target flux 680 mT, low annual volume, medical-grade audit controls.
Outcome
Not fit: adjusted thermal duty exceeds AH planning envelope for NdFeB.
Next step
Prioritize SmCo fallback or architecture redesign before spending cycle budget on high-risk NdFeB trials.
Assumptions
Peak 172C, humid industrial floor, target flux 910 mT, annual volume 80k, products destined for EU compliance lanes.
Outcome
Conditional: NdFeB is technically feasible but procurement path is gated by CRMA traceability and recycled-content disclosure readiness.
Next step
Hold dual-source lane and lock supplier traceability payload (origin + recycled content assumptions) before line-freeze milestone.
Assumptions
Four large NdFeB blocks in one lifting-assist fixture, mixed-shift operation, ferromagnetic tool traffic, and one worker group that includes implanted-device users.
Outcome
Conditional: force target is feasible, but release confidence remains low until fail-safe lifting behavior and workplace-field zoning are validated.
Next step
Complete measured package/workplace field maps, verify lifting-device warning/hold-time evidence, and freeze edge-protection SOPs before SOP lock.
11) FAQ (decision-focused)
Questions are grouped by decision intent so teams can move from explanation to execution.
12) Next action
Share your duty profile and we will return a material-lane recommendation with grade window, coating strategy, validation checklist, and RFQ normalization notes.
Product Gallery
Example of a large rectangular NdFeB block
Specifications
| Primary geometry lane | Large sintered NdFeB blocks/rings for fixture, motor, and holding-force assemblies |
| Planning grade window | N35-N52 baseline with H/SH fallback when adjusted duty temperature and demag risk rise |
| Handling and safety boundary | Large parts require edge protection, controlled separation tools, and packaging controls before pilot and shipment |
| Shipment boundary | Air-lane commitments require package-field checks; mixed lanes should stay open until transport evidence closes |
| Tool output payload | Preliminary rule-based duty band, qualitative flags, boundary notes, and the geometry/test data to provide for engineering review |
Need a quote-ready specification review?
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Reference Guides
Procurement-ready guides covering grades, coatings, QC, and RFQ prep.
Coatings & Corrosion
Corrosion protection for rare earth magnets
Environment-based guidance for selecting coatings and corrosion controls.
Manufacturing & Quality
Inspection and testing for NdFeB magnets
How to define inspection scope, measurement methods, and acceptable criteria.
Sourcing & Logistics
Magnet storage and handling safety
Storage, handling, and packaging guidance to avoid chipping, demagnetization, and injury.
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RFQ checklist
- Dimensions and shape (include drawing if possible).
- Grade and operating temperature range.
- Coating or surface treatment requirements.
- Quantity, target price, and delivery schedule.
- Tolerance, magnetization direction, and application notes.
Spec sheet downloads
Reference assets to speed up RFQ prep. Confirm specs before ordering.
NdFeB spec sheet (reference)
Grades, coatings, and RFQ checklist for NdFeB magnets.
SmCo spec sheet (reference)
High-temperature SmCo summary and RFQ checklist.
Ferrite spec sheet (reference)
Cost-optimized ferrite basics and RFQ checklist.
Alnico spec sheet (reference)
High-temperature Alnico grades and RFQ checklist.
Bonded NdFeB spec sheet (reference)
Bonded NdFeB process notes and RFQ checklist.
Flexible rubber magnet spec sheet (reference)
Flexible magnet tape basics and RFQ checklist.
Magnetic assembly spec sheet (reference)
Pot magnet assembly fundamentals and RFQ checklist.
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Product data is sourced from partner suppliers and confirmed per order.
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