PVC pipe can be divided into soft PVC pipe and rigid PVC pipe.
Soft PVC pipe is generally used for floors, ceilings and leather surface, but because of soft PVC pipe containing softener (which is the difference between soft PVC and rigid PVC pipe), is easy to become brittle and difficult to preserve, so its use is limited. Hard PVC free softener, good flexibility, easy molding and difficult to brittle, toxic pollution, save for a long time, so a lot of development and application of value. Hereinafter referred to as PVC. PVC is essentially a vacuum plastic film for packaging of various types of panel surface, is also known as the decorative film, with a film, used in building materials, packaging, pharmaceutical and many other industries. The building materials industry accounted for the largest proportion, 60%, followed by the packaging industry, as well as the application of a number of other small-scale industry.

To identify the PVC pipe:
1 looking at the surface finish, and whiteness.
2 Take samples fell easily shattered the generally high calcium products.
3 Take samples with a foot on the side of the pipe and see if we can crack or split after the elongation at break. 
4 the weather is very troublesome. The most direct way is to get high-Wen Gaoguang put a couple of days, at face value the rate of change.