When silicon carbide particles that pass through the skin with the preparation process of the heat to the aluminum. After checking, it was found that there is a quantity of silicon carbide particles that are embedded in the floor, aluminium. With an average close to fill the silicon carbide particles that fail to prepare the surface. When the parts go for polishing with sand paper to examine the structure of a comma, it was found that there have been leaked out of the silicon carbide particles.
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