精品国产自在现线看_亚洲综合欧美日韩一区_麻豆国产沈芯语在线91精品_欧美日韩亚洲另类一区_无码乱码在线观看富二代_女人把男人逼崩溃的软件_a级毛片无码真人_色欲天天婬色婬香www夜色_91久久综合精品女_麻豆精品国产自产在线观看

2PE anti-corrosion production line: 2PE anti-corrosion (second layer of polyethylene pipe layer PE anticorrosive structure, the first layer adhesive (AD), the second layer of polyethylene (PE), two kinds of materials as a whole, the thickness of each layer and three layer PE same. It can be seen from the difference is: the 3PE anticorrosion more a layer of epoxy powder, and epoxy powder resistant corrosion resistance, good mechanical performance, strong resistance to cathodic disbonding, although it has a surface treatment strictly, poor weather resistance, bibulous rate is high, etc., but it is useful to buried seabed pipeline, coating layer thickness is only 0.3 to 0.5 mm, service life of up to 40 ~ 50 years.