Compared with the high magnetic NdFeB magnets, magnetic better suited to work in high temperature environments. With the development of society, more and more high- magnetic applications range from high-tech products to the most simple packaging magnetic , currently the most widely used is NdFeB magnets and ferrite magnets . From the perspective of the history of magnets , turn of the century , people mainly use carbon steel, tungsten steel, chrome steel and cobalt steel for permanent magnet materials . The late 1930s , the successful development of Alnico magnet , it makes possible large-scale application of the magnet . Fifties, appeared barium ferrite magnet , not only reduces the cost of permanent magnets , permanent magnet materials in turn broaden the range of applications to high frequency fields. The sixties, samarium cobalt permanent emergence application of the magnet was opened up a new era.
Depression glass repair could be a large force of suction , or vacuum or magnet. In fact, not like that. At least by now , it was just a fantasy, because the vacuum chuck or high-strength magnet sucker is impossible to sag adsorption flat . This is not absolute . For example, special parts can be gently introduced to using suction cups can be sucked out . But this depression 1000 which may not have one.