Thread: Q radiator Expansion/ header tank
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Old 17th November 2009, 02:49 AM
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Quote:
Originally Posted by ijkl842 View Post
Some ferromagnetic materials can be magnetised by a magnetic field but do not tend to remain magnetised when the field is removed; these are termed soft. Permanent magnets are made from magnetically hard ferromagnetic materials that stay magnetized. solarwaterheaters.cc
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