High-Quality Magnet 3m Factories & Product

Under normal operating conditions, NdFeB permanent magnets exhibit extremely low magnetic decay—typically less than 1% over a decade. However, significant loss of holding force can occur due to three main factors:

1. Excessive Temperature: Operating above the magnet's rated temperature (e.g., exceeding 80°C for standard grades or 120°C for H-grade magnets) can cause thermal demagnetization.

2. Physical Shock: Severe impact can damage the internal sintered neodymium crystal structure.

3. Chemical Corrosion: Concrete moisture and chemical agents can corrode the magnetic core if the outer casing is damaged. Regular inspection and maintaining clean contact surfaces help prevent premature wear.

Selecting the appropriate holding force depends on panel thickness, formwork height, material weight (timber vs. steel), and casting methods:

- 600kg to 900kg: Best for thin internal walls, small window formers, and lightweight timber profiles.

- 1000kg to 1600kg: Ideal for standard partition walls, floor slabs, and average-height steel side rails.

- 2100kg to 2500kg: Recommended for tall, heavy exterior wall panels and high-pressure casting environments with intense vibration.

Both materials offer distinct advantages depending on your operational environment:

- Carbon Steel: Provides excellent mechanical strength and helps complete the magnetic circuit, maximizing holding force. It is treated with anti-corrosion coatings to protect against rust.

- Stainless Steel: Offers superior corrosion resistance, making it ideal for highly humid environments or wet casting setups. It is also easier to clean but typically costs more.

Yes, customization is common in precast concrete manufacturing. QCM Magnet offers engineering services to design custom adapters, adapter plates, and magnetic chamfers to match your specific formwork profiles.

By sharing your CAD drawings, our engineering team can produce tailored models that integrate seamlessly into your production lines.

To maintain optimal clamping force and extend service life, follow these best practices:

- Keep the contact surface of the magnet and the steel table clean. Remove concrete paste, oil, and rust before positioning.

- Use release agents correctly. Do not spray agents directly onto the magnet's active face, as this can affect friction and holding stability.

- Use dedicated release levers to disengage magnets. Avoid hitting the housing with heavy tools.

Each production run undergoes testing on our high-precision tensile test bench. The magnet is attached to a polished steel table, and a vertical pull force is applied until it disengages.

The peak force is recorded electronically, and we can provide pull-force test certificates with your shipment.