ABS/PVC are they safe?

[JimE]

Coming out of lurk to add to this (doesnt happen too often as I usually don't have anything intelligent to add )

IMO, from what I've picked up through the years, the comments about CPVC could come across a bit misleading. "Chlorine" is not added to regular pvc to create a "biostatic" form of plastic. The addition changes the molecular structure, making cpvc which has a unique set of properties. The most significant being a much higher working temperature which makes it suitable for hot & cold potable water systems.

As far as "releasing" something to prevent biofouling, I have not come across that before. This is the only info I could come up with quickly and it doesnt show a significant difference between pvc and cpvc.



The major heath concern is with residual vinyl chloride monomer, a by product of the manufacturing process. This is a downfall of both pvc and cpvc though so I don't think its a valid objection for use.

There is both potable & non-potable abs around, the difference might just be certification but who knows. I haven't heard of it being "treated" for fouling though - I agree its probably urban myth. Just my .02

Jim