PTFE Coating for Magnets
PTFE coating, also known as Teflon , or Polytetrafluoroethylene (commonly known as “the King of Plastic”). It is a synthetic fluoropolymer discovered by Roy Plunkett.
Teflon is a fluorocarbon-based polymer with multiple strong carbon-fluorine bonds. This feature makes it highly resistant to a variety of substances. For most regular consumers, Teflon is famous for its most common application on non-stick pans and other cookware.
Actually, thanks to the strength of the carbon-fluorine bonds, Teflon coatings are also widely used in containers and piping systems for reactive or corrosive chemicals.
Advantages Of PTFE-Coated Neodymium Magnets
1). PTFE is non-stick. Therefore, it can make PTFE-coated magnets easy to clean, and less likely for pollutants to accumulate on their surfaces. This coating is a good choice if keeping the magnets clean is an important consideration for you.
2). Low coefficient of friction. The coefficient of friction of PTFE coating is less than 0.1, which is only behind the diamond. This is an important feature to consider if your application will require the magnets to have smoothness to a certain extent.
3). Water resistance. The surfaces of neodymium magnets with PTFE coating will be shielded from water and many other liquids. Even during production, it is also difficult for them to be contaminated by various solutions, even the lubricants for machines. If there is dirt on their surface, you can clean them by gentle swiping.
4). Temperature resistance. PTFE coating can work properly within a wide range of temperatures, usually up to 240 °C – 260 °C without any problem. This is much higher than the working temperatures of neodymium magnets themselves. It will be an ideal solution if your applications will be under high-temperature conditions.
5). Wear resistance. A surface coated with PTFE will have excellent resistance against tear and wear. Just imagine how many times you will use non-stick cookware to make food. The non-stick coating will still last for years. Consider this coating if the durability of coating is important for your applications.
6). Chemical resistance. Some other types of coating seem to completely cover the neodymium magnets inside at the first glance. However, technically speaking, this is not true. For example, for the coating of natural rubber, there are very small pinholes, which are not visible to the naked eye. Therefore, the neodymium magnets will have a faster gradual degradation.
However, PTFE coating won’t have this issue. It doesn’t have pinholes, so it has much more excellent resistance to acid and alkaline pollutants. Therefore, it can assure a longer life span for the neodymium magnets inside.