Polyvinyl chloride (PVC) is the third most produced synthetic polymer plastic in the world (after polyethylene and polypropylene), with about 40 million tons of PVC produced annually. PVC is vinyl chloride monomer (VCM) in peroxide, azo compounds and other initiators or under the action of light, heat according to the free radical polymerization reaction mechanism polymerization. Vinyl chloride homopolymer and vinyl chloride copolymer collectively known as vinyl chloride resin. PVC was once the world's largest general-purpose plastic in production and was widely used. PVC comes in hard (sometimes abbreviated RPVC) and soft. Rigid PVC is used in building pipes, doors and Windows. It is also used to make plastic bottles, packaging, bank cards or membership cards. Adding plasticizers can make PVC softer and more elastic. It can be used in plumbing, cable insulation, flooring, signage, phonograph records, inflatable products, and rubber substitutes.
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