av无码a在线看|亚洲综合久久一区二区|日韩国产欧美精品在线|欧美图片欧美激情欧美精品|国内无码一级毛片中文字幕|精品综合久久88少妇激情|正在播放国产国语在线精彩视频|国产在线精品免费一区二区三区

Polyurethane is the abbreviation of polyurethane. Its English name is polyurethane, which is a kind of polymer material. Polyurethane is an emerging organic polymer material, known as the "fifth largest plastic", and is widely used in many areas of the national economy because of its excellent properties. Product applications include light industry, chemicals, electronics, textiles, medical, construction, building materials, automotive, national defense, aerospace, aviation, etc.

Polyurethane sealant has many excellent characteristics, including: (1) wide adjustable range of performance and strong adaptability (2) good abrasion resistance; (3) high mechanical strength; (4) good bonding performance; (5) good elasticity , Has excellent resilience, can be used for dynamic seams; (6) good low temperature flexibility; (7) good weather resistance, service life up to 15-20 years; (8) good oil resistance; (9) biological aging resistance; (10) The price is moderate.