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Vacuum diecasting process was introduced into mass production in 1983，after GF (Gas free) process had been invented．Just around the same time，OPTI-VAC process was advocated in Europe，but it did not spread so much．On the other hand，GF process was introduced to all major diecaster and automobile maker in Japan and 52,690 ton(7.7％ of total yearly diecasting production)was cast with this process in 1992．After few years，GF process started introducing into European market and became popular vacuum diecasting process in the world．