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 could be produced on Mars from vinyl chloride, itself a product of the hydrochlorination of acetylene.
Uses
PVC is used for piping and insulation of electric cables.