A friend of mine is a chemist, and also a brewer that I highly respect. We are putting together a massive system, and were considering CPVC for the mashtun until I got his feedback on the suitability of this material. It is pretty eye opening:
CPVC at elevated temps (say above 120°F) is toxic. It releases unreacted trimethyltin chloride and other organotin species which are highly toxic. They would eventually get reduced to water soluble tin compounds and release hydrochloric acid as a byproduct (which may screw up your mash pH). The tin is a radical catalyst (and hence why it's used in CPVC synthesis) and would produce radicals internally when consumed. Radicals are what cause cancer. PVC and CPVC are only suitable at ambient temperatures and really shouldn't even be used on hot water pipes in homes.
CPVC just got crossed off my list.
CPVC at elevated temps (say above 120°F) is toxic. It releases unreacted trimethyltin chloride and other organotin species which are highly toxic. They would eventually get reduced to water soluble tin compounds and release hydrochloric acid as a byproduct (which may screw up your mash pH). The tin is a radical catalyst (and hence why it's used in CPVC synthesis) and would produce radicals internally when consumed. Radicals are what cause cancer. PVC and CPVC are only suitable at ambient temperatures and really shouldn't even be used on hot water pipes in homes.
CPVC just got crossed off my list.