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Composite is arranged from material with function as matrix that has weaker characteristic and material with fillerfunction that has a function to transfer force from load in matrix. Plastic has more advantages than other materials;those are, able to be formed finely, light in weight, easy to get and the price is cheaper relatively. However, the problem isthe filler that is involved here is still using fiberglass in which it will disturb human health. Alumina dust used here isMerck by particledoi:10.22219/jtiumm.vol12.no1.16-19 fatcat:e2tjfj7mxzdnpnr5zpgiwitfke