CTM – CrackTest® Permanent Magnets Aluminium Body (1 Pair – Gold Annodised) The body of these magnets are machined here in Australia from Aluminium and use rare earth magnets. The bodies are annodised and are supplied with a mild steel keeper. These magnets lift the standard 18kg test block.
A rare-earth magnet is a strong permanent magnet made from alloys of rare earth elements, or lanthanide metals, with other metals. They are substantially stronger than ferrite or alnico magnets. The magnetic field produced by rare-earth magnets can be well over 1.2 teslas. By comparison, ferrite or ceramic magnets typically exhibit around 50 to 100 milliteslas. The most powerful and affordable type of rare-earth magnet is a neodymium magnet. Neodymium magnets are made of neodymium, iron and boron in the formula Nd2Fe14B.