辨别PVC管材的好坏的方法
How to distinguish the quality of PVC pipes
（1）先看表面光洁度，以及白度。
(1) First look at the surface finish and whiteness.
（2）拿样品摔，容易河北立体车库 消防报警器塑料配件 电缆接地箱 电缆保护接地箱 塑料土工格栅 消弧线圈装置 摔碎者一般是高钙产品，当然要符合你们的要求价格合适的话是可以的。
(2) Take samples to fall, easy to fall is generally high calcium products, of course, to meet your requirements price is appropriate.
（3）拿样品用脚踩管材的边，看看是否能裂开，或者裂开后的断裂伸长率。
(3) Take the sample and step on the edge of the pipe to see if it can crack, or the elongation at break after cracking.
（4）耐侯方面挺麻烦的。最直接的办法就是拿到高温高光的地方放个几天，看表面变化率，但太浪费时间。主要看前3项就好。
(4) It's very troublesome in terms of weather tolerance. The most direct way is to take a few days to see the surface change rate, but it is a waste of time. Mainly look at the first three items