Magnetic separator grid

The most critical factor is the Magnetic Flux Density (Gauss rating). For fine iron particles, a minimum of 10,000 to 12,000 Gauss is required. You must also specify the tube diameter (typically 25mm) and the grid spacing, which should be optimized to balance material flow rate with filtration efficiency. Ensure the tubes are made of 304 or 316L stainless steel to prevent corrosion and ensure food or pharmaceutical grade safety.

Standard Neodymium (NdFeB) magnets are suitable for temperatures up to 80°C. If your production line involves high-heat processes, you must request high-temperature resistant grades (such as SH, UH, or EH) which can withstand up to 150°C - 200°C. For extreme heat applications exceeding 250°C, Samarium Cobalt (SmCo) magnets should be used to prevent permanent demagnetization.

For food processing, the separator must comply with FDA (Food and Drug Administration) standards and EC 1935/2004 regulations. Look for full-welded construction with a mirror-polished finish (Ra < 0.8μm) to eliminate bacteria-breeding crevices. In the chemical or mining sectors, ensure the housing meets ATEX explosion-proof requirements if operating in hazardous dust environments.

Request a Gauss Map report from the supplier to ensure magnetic uniformity across the tube surface. The welding quality is vital; look for Argon Arc Welding to ensure the tubes are hermetically sealed, preventing moisture from entering and oxidizing the internal magnets, which would lead to a total loss of magnetic force.

Magnetic goods are classified as 'Dangerous Goods' for air freight. You must ensure the supplier provides a Magnetic Inspection Report (DGM report) and uses shielded packaging (iron sheets or specialized boxes) to ensure the external magnetic field strength meets IATA standards. For sea freight, ensure anti-rust packaging (VCI bags) is used to protect the stainless steel finish from salty sea air.

Negotiate a magnetic decay guarantee; reputable suppliers should guarantee that the magnetic strength will not drop by more than 5% over 2-3 years under normal operating conditions. Use Made-in-China.com's Secured Trading services to hold a portion of the payment until a third-party inspection (like SGS or Intertek) verifies the Gauss levels upon completion.

Low-cost suppliers often use recycled magnets or thinner stainless steel walls, which lead to rapid magnetic loss or tube rupture. This can cause downstream equipment damage or product contamination. Always verify the material grade certificate and prioritize suppliers on Made-in-China.com who have Audited Supplier status and a proven track record in export markets.

Confirm the correct HS Code (typically 8474.10 or 8505.90) with your customs broker to determine the exact duty rates. Be aware of Anti-Dumping Duties that some regions (like the EU or USA) may apply to specific permanent magnet products originating from overseas. Ensure all Commercial Invoices and Packing Lists clearly state the magnetic strength and material composition to avoid customs delays.