This article analyzes and studies polyurethane composites from the perspectives of physical and chemical properties.Based on the reaction characteristics,tool marks are extracted from four common scratch bearing objects:wood,metal,plastic,and paint surface.The silicone rubber molding method is used as a control experiment,and the feasibility of polyurethane composites replacing the silicone rubber molding method is determined by comparing the operation time,material properties,and extraction effect.
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