Permanent Magnets are classified based on their composition: Neodymium Iron Boron (NdFeB), Samarium Cobalt (SmCo), Alnico, and Ferrite (also known as ceramic).
Rare earth magnets (NdFeB, SmCo) are stronger, NdFeB magnets are stronger and therefore being used where high energy is required or where the magnet needs to be small and strong. SmCo is being used for higher temperatures. Ceramic magnets are the cheapest and fairly strong and are used in mass production, quite usually a cost-effective solution if possible. Alnico is, however, least affected by temperature. You will find more information on our website or contact Magma Engineering Team for more designated information for more designated information from Magma Engineering Team.
How to ask for RFP and order permanent magnets?
It’s common to receive a request for quotation from our customers with a drawing of the requested magnet (and it’s a very good start). Still, most customers are unfamiliar with some of the elements you will have to consider when ordering permanent magnets. Here are some guidelines:
- Drawing – not requested for small quantities, but always useful. In most cases, Magma team will issue another drawing with the customer’s information and additional technical requirement, if needed.
- Magnetic properties requirements. Minimum values according to your company R&D or engineering request and sometimes maximum values.
- Quantity required. Please state lot size and period to be consumed.
- The required magnetization state (unmagnetized, fully magnetized, etc.).
- Working temperature (humidity or other information that might affect).
- Certification of magnetic properties.
- Marking and packaging requirements.
- Special requirements: such as plating, coating, functional testing, or more.
- Warning – Ceramic magnets are used for their magnetic characteristics. The end-use application should not rely on them for structural purposes due to their low tensile and flexural strength. These materials are very brittle, and they chip and break easily
Standard for permanent magnets:
- MMPA Standard No. 0100-00 Standard Specifications for Permanent Magnet Materials
- ASTM A1054 – 07 Standard Specification for Sintered Ceramic Ferrite Permanent Magnets
- IEC 60404-8-1, Magnetic Materials Part 8: Specifications for individual materials Section 1 – Standard specifications for magnetically hard materials