PP - Polypropylene
lightweight
temperature up to 180oF (82oC)
highly resistant to acids, bases and many solvents
usable in laboratory plumbing
PVC - Polyvinyl Chloride
strong and rigid
resistant to a variety of acids and bases
may be damaged by some solvents and chlorinated hydrocarbons
maximum usable temperature 140oF (60oC)
usable for water, gas and drainage systems
not useable in hot water systems
CPVC - Chlorinated Polyvinyl Chlori