Any of various resins,widely varying in flexibility,used in tough chemical - resistant coatings,adhesives,and foams.

 
  • 聚氨基甲酸乙酯;聚氨酯一种在韧性上差别很大的树脂,用于坚固的抗化学物质涂面、黏合剂和泡沫中
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