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The rapid development of air filters is closely related to the development of military industry and electronic industry. In the first world war, the use of various chemical agents, asbestos fibre filter paper as the smoke filter layer of military gas masks came into being. The glass fiber filter medium is used in air filtration to obtain a patent in the United States in October 1940. In the 1950s, the United States studied the production process of glass fiber filter paper, and the air filter was improved and developed. In the 1960s, HEPA filters came out; In the 1970s, the filter paper of fine glass fiber was used as the HEPA filter of filter medium, and the filtration efficiency of particle size of 013 micron particle diameter was 99.9998%. Since the eighty s, with the emergence of new test method, use evaluation to improve and to improve the filtering performance requirements, found the HEPA filter there is a serious problem, and he had a higher ULPA filter performance. Countries are still working on it and expect more advanced air filters soon
Of course, repairing a damaged alloy wheel might be tricky. Many think that a cracked or bent wheel can simply be bent back into place, nonetheless it isn't that simple. Fortunately, we of experts carries a method of safely repairing a damaged wheel that may remove even unnoticeable cracks and other weak spots. The wheel is installed on a vehicle simulator, and as heat, pressure and lightweight vibrations are applied to the wheel the alloy moves back in place without cracking. The wheel retains its original strength once it cools. It is also washed thoroughly, since brake dust and rust can hide small cracks. Once the wheel is restored and cleaned, it can be inspected thoroughly by all of us of experts.
Audi, a German company that makes cars and motorcycles, dates back to the 19th century. Initially located in Saxony four car companies - zwickau city (zwickau) audi (audi) and horch (horch) motors, chemnitz - sigma city (chemnitz - siegmar) rover auto company (wanderer) and DKW zschopau city car companies, for the progress of the German car industry has made outstanding contributions.
Note that the epoxy adhesive curing speed varies determined by temperature. At higher temperatures it dries faster, but has less resistance and firmness. During the winter you might also leave a short while in double boiler pots, and continue to take certain temperature (never to be greater than 30 degrees in any way), like too cold, the pad becomes more complicated, thus a viscous mix.
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