Magnetic material

Buyers must prioritize Magnetic Grade (e.g., N35, N52 for Neodymium) and Remanence (Br), which indicates the magnetic field strength. Additionally, Coercivity (Hcb/Hcj) is critical to ensure the material resists demagnetization. For high-temperature applications, verify the Maximum Operating Temperature and Curie Temperature to prevent permanent loss of magnetism.

Since many high-performance magnets (like NdFeB) are prone to corrosion, specify the Coating Type such as Ni-Cu-Ni (Nickel), Zinc, or Epoxy. For outdoor or harsh environments, Salt Spray Testing (SST) results should be requested, typically aiming for 24 to 96 hours of resistance depending on the application.

Suppliers must provide RoHS and REACH certifications to ensure the absence of hazardous substances. If the magnets are used in electronics or medical devices, look for ISO 9001 for quality management and IATF 16949 if sourcing for the automotive industry. For US-bound shipments, ensure compliance with TSCA regulations.

Request a Demagnetization Curve (B-H Curve) report from the supplier's laboratory. You should also ask for Gaussian Meter readings on samples and consider Third-Party Inspection (such as SGS or Intertek) to verify that the Magnetic Flux meets your specific engineering requirements.

Magnets are classified as Class 9 Dangerous Goods in air transport if their magnetic field strength exceeds specific limits. You must ensure the supplier provides Magnetic Shielding Packaging (using iron sheets) and obtains a Magnetic Inspection Report (DGM) to certify the shipment is safe for flight. Failure to do so can lead to shipment rejection or heavy fines.

Prices for rare-earth magnets are highly sensitive to Raw Material Market Fluctuations (e.g., PrNd oxide prices). It is wise to negotiate a Price Adjustment Mechanism based on market indices. For custom shapes, expect a Tooling Fee, but you can often negotiate a refund of this fee once cumulative order volumes reach a certain threshold.

Always use Secure Payment Terms such as Letters of Credit (L/C) or escrow services provided by reputable platforms like Made-in-China.com. Avoid paying 100% upfront; a standard 30% deposit and 70% balance against the Bill of Lading (B/L) after a successful pre-shipment inspection is the industry norm for mitigating risk.

Be aware of Export Licenses required by the exporting country for high-grade rare-earth materials. Additionally, check your local Customs Tariff Schedule for any Anti-Dumping Duties or specific trade barriers related to permanent magnets to accurately calculate your Total Landed Cost.