Methods for distinguishing the quality of PVC pipes

(1) First look at the surface finish and whiteness.
(2) Take the sample and throw it. The products that are easy to break are usually high calcium products. Of course, if the price is appropriate, it can meet your requirements.
(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) The weather resistance is very troublesome. The direct way is to take a place with high temperature and high light for a few days to see the surface change rate, but it is too time-consuming. It would be good to focus on the first three items.