Magnet for gasket

When sourcing magnets for gaskets (commonly used in refrigerators, shower doors, or industrial enclosures), you must prioritize Magnetic Flux Density (Gauss) and Pull Force to ensure a tight seal. The material is typically Flexible Ferrite (Rubber Magnet), which must maintain a remanence (Br) of at least 1600-2400 Gauss. Additionally, verify the dimensional tolerances, usually requiring a precision of ±0.1mm, and ensure the magnet is UV-resistant and anti-aging to prevent brittleness over time.

Compatibility depends on the migration resistance of the magnet's binder. You should request suppliers to provide chemical compatibility test reports to ensure the plasticizers in the PVC gasket do not react with the rubber magnet, which could cause the gasket to become sticky or lose flexibility. For TPE gaskets, ensure the magnet can withstand the higher extrusion temperatures (often up to 160°C-180°C) without losing its magnetic properties (demagnetization).

For international trade, the magnets must comply with RoHS (Restriction of Hazardous Substances) and REACH regulations to ensure they are free from lead, cadmium, and phthalates. If the gaskets are for food-related appliances (like commercial fridges), the materials should ideally meet FDA or LFGB food-grade contact standards. Always ask the supplier for SGS or Intertek certification to verify these claims.

A high-quality gasket magnet should pass a flexibility test, where it is wrapped around a 10mm mandrel without cracking at -20°C. Furthermore, check the demagnetization rate; professional-grade magnets should lose less than 5% of their magnetic strength over 10 years. Request Salt Spray Testing results if the product will be used in high-moisture environments like bathrooms or coastal regions to prevent surface oxidation.

Magnets are classified as 'Dangerous Goods' for air freight if they exceed a certain magnetic field strength at a specific distance. To avoid shipment rejection or high surcharges, ensure the supplier provides Magnetic Shielding Packaging and a Magnetic Inspection Report from a recognized body like DGM. For sea freight, the primary risk is moisture and corrosion, so specify the use of vacuum-sealed plastic packaging and silica gel desiccant.

Since gasket magnets are often produced via extrusion, MOQs are usually measured in meters (e.g., 1,000m - 5,000m). To get the best price, negotiate based on annual volume rather than a single spot order. Ask for a tiered pricing structure where the unit price drops by 5-10% as volume doubles. Always clarify if the price includes the cost of customized molds for specific cross-sectional shapes.

Always utilize Secured Trading Services provided by Made-in-China.com to protect your payment. Use a 30% deposit and 70% balance payment structure, where the balance is paid only after a Pre-Shipment Inspection (PSI). Hire a third-party inspector to verify the magnetic polarity consistency and dimensional accuracy before the goods leave the factory to avoid the high cost of international returns.

Be aware of Anti-Dumping Duties (ADD) that some regions (like the EU or USA) may impose on specific magnetic products from certain origins. Check the HS Code (typically 8505.19) against your local customs tariff schedule. Ensure the Certificate of Origin (CO) is accurately prepared to benefit from any Free Trade Agreements (FTA) that might reduce your import duties.