Parvovirus B19, which causes fifth disease in humans, is a member of the Erythrovirus genus of the Parvoviridae. Prior to 2014, it was also the name applied to a genus within the subfamily Parvovirinae, but this has been amended to genus Protoparvovirus to avoid confusion between taxonomic levels.
PVC redirects here. For other uses, see PVC (disambiguation). Polyvinyl chloride (/ËpÉlivaÉªnÉl ËklÉÉraÉªd/), more correctly but unusually poly(vinyl chloride), commonly abbreviated PVC, is the world's third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene. PVC comes in two basic forms: rigid (sometimes abbreviated as RPVC) and flexible.
Types of Plastics. Quick Tips #213. The term plastics describes a group of chemicals called polymers. Heating hydrocarbons (oil, natural gas or coal) produces plastics. This process is called cracking because a catalyst is used to break larger molecules into smaller ones.