About PVC|Polyvinyl chloride, rigid (Type 1). Good chemical resistance, flame retardancy, and mechanical properties at low cost. Used for chemical processing tanks, valve bodies, fume hoods, and electrical enclosures. Machines well with sharp tools at moderate speeds. Do NOT overheat. PVC generates toxic hydrochloric acid fumes when it gets too hot. Use coolant and keep speeds moderate. Compare to CPVC (higher temperature rating) and
Polypropylene (lighter, better chemical resistance in some environments).