Our magnets are first coated with an epoxy coating, then coated with a hard plastic coating that protects the epoxy against scratches or damage finally placed inside the steel pot, giving it superior resistance against corrosion and protection against impact damage.
How is the strength of a magnet measured?
Gauss meters are used to measure the magnetic field density at the surface of the magnet. This is referred to as the surface field and is measured in Gauss (or Tesla). Pull Force Testers are used to test the holding force of a magnet that is in contact with a flat steel plate. Pull forces are measured in kilograms (or pounds).
Will a magnet with a 115kg pull force lift a 115kg object?
Because pull force values are tested under laboratory conditions, you probably won't achieve the same holding force under real world conditions. The effective pull force is reduced by uneven contact with the metal surface, pulling in a direction that is not perpendicular to the steel, attaching to metal that is thinner than ideal, surface coatings, and other factors.
Will my neodymium magnets lose strength over time?
Very little. Neodymium magnets are the strongest and most permanent magnets known to man. If they are not overheated or physically damaged, neodymium magnets will lose less than 1% of their strength over 10 years - not enough for you to notice unless you have very sensitive measuring equipment. They won't even lose their strength if they are held in repelling or attracting positions with other magnets over long periods of time.
Do I have to worry about temperature with neodymium magnets?
Yes. Neodymium Iron Boron magnets are sensitive to heat. If a magnet heated above its maximum operating temperature (176°F (80°C) for standard N grades) the magnet will permanently lose a fraction of its magnetic strength. If they are heated above their Curie temperature (590°F (310°C) for standard N grades), they will lose all of their magnetic properties. Different grades have different maximum operating and Curie temperatures.
Do neodymium magnets require a keeper?
No, neodymium magnets do not require a keeper for storage like Alnico magnets.
AN INTRODUCTION TO NEODYMIUM MAGNETS
Neodymium magnets are the most powerful and advanced commercialised permanent magnets today – first developed in the 1980’s.
Neodymium Magnets are made from an alloy containing, amongst others, the elements Neodymium, Iron and Boron (NdFeB). This is the strongest type of rare earth magnet commercially available and are manufactured in a wide range of shapes, sizes and grades.
The NdFeB magnets are anisotropic sintered neodymium iron boron – the alloy is jet milled to a fine powder. The magnetization direction depends on the element of raw material. The NdFeB magnets are then sintered to fuse the powder together before final machining and magnetising produces the completed super strength Neodymium magnet. Permanent magnets have a high resistance to demagnetisation, unlike most other types of magnets. NdFeB magnets are extremely powerful by volume and will retain magnet properties for decades.
A Pot Magnet is a magnetic assembly. It is usually a two part component comprising a magnet within a cup-shaped ferromagnetic plated mild steel housing. The pot magnet is designed to clamp with high magnetic forces when in direct contact with ferromagnetic (e.g. mild steel) surfaces.
The design of pot magnets is such that only one surface has the magnetic performance (the side where the magnets is visible). The ferromagnetic cup carries magnetism around directing magnetism into the surface to be clamped to make an efficient complete magnetic circuit with minimal air gap. So if a magnet has its North face showing, the ferrous ring of mild steel around the outside is acting like a South Pole – in effect giving two poles on the clamping surface.
Pot magnets protect the magnets inside them. The mild steel housings can take higher forces, higher mechanical knocks, and higher loads, preventing the magnet from breaking or shattering if it were used on its own.