Polyvinyl Chloride
Polyvinyl chloride, or PVC, is a polymerized form of Vinyl chloride. It take the form of a chain of Vinyl Chloride molecules.
It is the third most common plastics after polyethylene (PE) and polypropylene (PP).
In Situ production
PVC can be produced on Mars by polymerization of vinyl chloride, itself a product of the hydrochlorination of acetylene.
Polymerization requires the use of polymerization initiator and other additives. A typical initiator is peroxide.
Uses
PVC is used for piping and insulation of electric cables.