A magnet shipment rarely gets held at customs because of the magnets themselves. It gets held because one document in the package doesn’t match another, or because a required certificate was never issued in the first place. As magnet suppliers, we see this from the export side more often than buyers see it from the import side — so this article sets out, plainly, what a complete document package should contain and why.
Why NdFeB Shipments Require More Than a Standard Component Package
Sintered NdFeB magnets fall under four overlapping documentation categories, and a shipment package needs to satisfy all four simultaneously:
- Industrial component — standard commercial and customs paperwork applies.
- Coated metal product — triggers safety data sheet and chemical compliance requirements.
- Strategic raw material — neodymium, praseodymium, and in higher grades, dysprosium and terbium, are subject to export licensing controls in China.
- Magnetized cargo — regulated separately under IATA rules for air transport due to interference risk with aircraft instrumentation.
A package built only around the first category — invoice and packing list — is the one that stalls in customs.
Commercial Documents
These form the transactional baseline. Errors here are administrative, but they propagate into customs and banking issues downstream.
Commercial Invoice — HS code, unit price, total value, Incoterms, and a product description specific enough to match the customs declaration: grade designation, dimensions, coating type. “Magnets” alone is not sufficient.
Packing List — Must reconcile exactly with the invoice: piece count, gross/net weight per carton, carton dimensions, total shipment weight. Weight discrepancies against actual cargo are a common inspection trigger.
Certificate of Origin — Supports preferential tariff treatment where applicable, and is often requested independently by the buyer’s customs broker regardless.
Bill of Lading / Air Waybill — The goods description here must be consistent with the dangerous goods declaration below. Inconsistencies between the two are a frequent cause of carrier-side holds.
Compliance and Safety Documentation
This is where magnet shipments diverge from generic industrial cargo, and where engineering-level accuracy matters.
Safety Data Sheet (SDS/MSDS) — Coating type (Ni-Cu-Ni, Zn, epoxy, or other) and base alloy composition both factor into GHS hazard classification. The SDS should be product-specific and current, not a generic template, and should be in the buyer’s EHS team’s hands before goods arrive.
REACH / RoHS Compliance Statements — Standard requirement for EU-bound shipments: a REACH declaration addressing substances of very high concern, and a RoHS statement where the magnets are destined for electrical or electronic equipment. Issued as standalone letters, not folded into the SDS.
Magnetized Material / Dangerous Goods Declaration — Magnets exceeding IATA’s defined field-strength threshold, measured at a specified distance from the package surface, are classified as Class 9 hazardous material for air freight. Packaging and shielding can qualify a shipment for exemption from this classification — but that determination needs to be documented, not confirmed verbally by the forwarder.
Mill Test Certificate / Certificate of Analysis — Batch-specific confirmation of magnetic properties (Br, Hcj, Hcb, BHmax) and dimensional tolerances against the purchase order spec. For automotive, medical, or aerospace end-use, buyers may also require a certificate of conformity referencing the applicable standar.
Export Control and Dual-Use Documentation
This category is the least familiar to buyers outside China and the one most worth understanding at the engineering level, since it’s tied directly to grade selection.
Under China’s April 2025 dual-use export control update (MOFCOM Announcement No. 18), rare earth elements and compounds — dysprosium and terbium in particular — trigger export licensing requirements above defined thresholds, or when end-use falls into controlled categories.
To move a shipment without a dual-use permit, the exporter documents that the product sits outside the controlled scope:
- A composition declaration confirming the magnets are manufactured without dysprosium or terbium, or below the relevant threshold.
- Export documentation from the manufacturer confirming HS code classification and the basis for exemption from licensing.
The engineering point worth raising during grade selection: a Dy/Tb-free grade that meets the required thermal stability (Hcj) and coercivity for the application clears customs without MOFCOM licensing. An equivalent-performance grade containing heavy rare earths can add weeks of lead time for permit approval. This is a specification decision, not a shipping-desk problem, and it’s most efficient to resolve it during quotation.
Insurance and Banking Documents
Depending on payment terms and Incoterms:
- Insurance Certificate — required under CIF/CIP terms.
- L/C-required documents — where payment is via letter of credit, every document in the package must match the L/C wording exactly, including consignee name spelling and port of loading.
Pre-Shipment Document Checklist
| Document | Purpose | Common Failure Point |
|---|---|---|
| Commercial Invoice | Customs valuation | Vague product description |
| Packing List | Customs, warehousing | Weight mismatch vs. actual cargo |
| Certificate of Origin | Tariff preference | Missing or expired |
| Bill of Lading / AWB | Transport contract | Inconsistent with DG declaration |
| SDS | Handling and workplace safety | Generic, non-product-specific |
| REACH/RoHS Declaration | EU regulatory compliance | Requested late, after goods arrive |
| DG / Magnetized Material Declaration | Air transport safety | Field-strength exemption undocumented |
| Mill Test Certificate | Spec verification | Properties not tested per batch |
| Composition / Dual-Use Declaration | MOFCOM export control | Missing for Dy/Tb-free claims |
| Insurance Certificate | Risk coverage under CIF/CIP | Absent under relevant Incoterms |
Summary
Individually, none of these documents are unusual. What sets NdFeB magnet shipments apart is that all four categories — commercial, safety, export control, and transport — apply at once, and a gap in any one of them is enough to stop a shipment. Specifying the full package at quotation stage, rather than assembling it after a customs hold, is what keeps lead times predictable.
For questions on documentation requirements for a specific grade, coating, or destination market, our engineering team can confirm what applies before the order is placed.
Contact XHMAG’s engineering team at tony@xh-magnet.com to review the document requirements for your shipment before you place an order — a short conversation at the quotation stage is enough to confirm grade selection, compliance paperwork, and export classification in advance.
