Strong arc magnet

When purchasing arc magnets, the most critical factor is the Grade of the material (e.g., N35, N52, 42SH), which determines the magnetic energy product (BHmax) and temperature resistance. You must also specify the Coating/Plating (Ni-Cu-Ni, Zinc, or Epoxy) to prevent oxidation, especially for Neodymium magnets. Ensure the Dimensional Tolerances are within ±0.05mm, as arc magnets are often used in precision motors where fit is crucial.

Standard Neodymium magnets lose magnetism above 80°C. For industrial motors, you must select grades with High Coercivity (Hci), such as M, H, SH, UH, or EH series, which can withstand temperatures up to 200°C. Always request a Demagnetization Curve (Hysteresis Loop) report from the supplier to verify performance at your specific operating temperature.

Suppliers must provide RoHS (Restriction of Hazardous Substances) and REACH certifications to ensure the magnets do not contain banned environmental toxins. For automotive or high-end industrial use, look for suppliers certified under IATF 16949 or ISO 9001:2015 to guarantee process consistency and quality control.

Request the supplier to perform a Flux Density test using a Gaussmeter or a Total Flux test using a Helmholtz Coil. It is vital to confirm the Magnetization Direction (Diametrically or Axially), as incorrect orientation renders arc magnets useless for motor rotors or stators. Ask for a Video Inspection of a polarity test during the QC phase.

Magnets are classified as Class 9 Dangerous Goods in air transport if their magnetic field strength exceeds specific limits. You must ensure the supplier uses Magnetic Shielding Packaging (iron sheets and foam) to pass the IATA PI953 inspection. Failure to do so will result in the shipment being rejected by the airline or confiscated by customs.

Sintered Neodymium is extremely brittle and prone to chipping. Negotiate a packaging standard that includes individual vacuum sealing and heavy-duty wooden crates for sea freight. Use Made-in-China.com's Secured Trading services to hold payment until a third-party inspection confirms the physical integrity of the magnets upon arrival.

The price of Strong Arc Magnets is highly sensitive to Rare Earth market fluctuations (PrNd metal prices). To secure stable pricing, consider signing a Long-term Framework Agreement or purchasing in bulk when raw material indices are low. Always ask for a Price Breakdown that separates the material cost from the machining/coating costs to ensure transparency.

Ensure the HS Code (typically 8505.11) is correctly declared. Be aware of Anti-dumping duties or specific trade policies regarding rare-earth permanent magnets. Work with a freight forwarder experienced in Specialized Industrial Goods to ensure all 'Certificate of Origin' documents are accurate to avoid costly port delays.