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????? ??? Polyurethane self-skinningover foam mixed component Polyurethane diol solution average Mn ~320, 88 wt. % in H2O Polyurethane thickening agent POLYURETHANEACRYLATE N/A Polyurethane anticorrosive coating Polyurethane topcoat Polyurethane bumper Polyurethane additive Polyurethane anti-corrosion primer Polyurethane bicycle seat Polyurethane paint thinner Polyurethane coating curing accelerator Polyurethane styrofoam Polyurethane self-skinning handrail Silicone oil for flexible polyurethane foam plastic Polyurethane-polyvinyl chloride imitation leather