Black Epoxy Block Neodymium Magnet for waterproof

Neodymium magnets are the most powerful of all permanent magnets. They are often known as “Super Magnets”.

Neodymium magnets (NdFeB), commonly known as ‘rare earth’ magnets are high-performance permanent magnets constructed from an alloy of neodymium, iron and boron. They are true permanent magnets and will not lose their magnetism unless they are heated to a temperature which exceeds the maximum operating temperature rating or their protective plating is damaged and water ingress causes rusting, which over time will magnetically and mechanically damage the magnets.

They are used in applications where the strongest magnetic force is required from the smallest possible volume of magnet material.

Even small neodymium magnets have a surprising amount of magnetic force and they are capable of lifting in excess of 1,000 times their own weight. A neodymium disc magnet weighing only 2 grams can lift a steel block weighing over 2,000 grams.
Recent miniaturisation of power tools, motors, generators and loud speakers have only been possible because of the amazing magnetic performance provided by modern neodymium magnets.

Neodymium magnets are relatively new, they were developed in the mid 1980s and can now be found extensively in countless modern applications from fridge magnets to wind turbines!
Since the introduction of neodymium magnets, the manufacturing cost of neodymium magnets has fallen in line with a massive increase in production capability and now small neodymium magnets are cheap enough to be used in low cost promotional giveaway items.