Polyvinyl chloride, commonly abbreviated PVC, is a thermoplastic polymer. It is a vinyl polymer constructed of repeating vinyl groups (ethenyls) having one hydrogen replaced by chloride. Polyvinyl chloride is the third most widely produced plastic, after polyethylene and polypropylene. PVC is widely used in construction because it is cheap, durable, and easily worked. PVC production is expected to exceed 40 million tonnes by 2016. According to IUPAC, polyvinyl chloride should be named poly(chloroethanediyl), but this name found no widespread use.