With the national economic development， polymeric materials have been around us everywhere， polymer materials products have become the youngest It not only throughout various industries， and has access to all the family， its production has more than metal materials trends， will be the most active material PVC polyvinyl chloride， is one of the polymers， but also the world's largest plastic products， cheap， widely used， is the modern society indispensable polymer materials， and has a very good development
