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Re: PVC/CPVC fumes hazards was(Out of round PVC)
AFAIK, the sole reason for CPVC's existence in residential applications is
that
"plain" PVC cannot handle "hot water" applications; it should raise some
flags
when a material's characteristics are regarded as unacceptable at such low
temperatures. Yes, I *have* seen "plain" PVC in such service, and we all
know that some NST's can work in TC service, sometimes.
FWIW, here stateside, CPVC is made in "CTS" copper tubing size, as are the
fittings, so that the two cannot be accidentally interchanged.
Everyone I know in the plumbing business thinks CPVC is the cat's ass;
But, ten years ago, everyone thought the same about polybutylene.
For those of you who may have polybutylene pipes, see:
http://www.pbpipe-dot-com to either opt-in or opt-out of one of the class-
action suits.
Randy
----- Original Message -----
From: Tesla List <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, May 05, 2000 6:11 PM
Subject: Re: PVC/CPVC fumes hazards was(Out of round PVC)
> Original Poster: "ROBERT CRESSLER" <robert.cressler-at-menasha-dot-com>
>
> randy,ruud,bob,
> in regards to fumes emissions from heating PVC
> and cpvc........
> HCL gas is the main (but not only!) nastiness that results from thermal
> decomposition
> of these materials....... this should not occur for PVC till well over
> 300*f and much higher for cpvc (which in pipe over a couple inches in dia
> is very rare and very expensive). Now saying this we have sawed 2"thk cpvc
> plate into blanks with excessive feed rates on a damp (high R.H.) day and
> the smell of HCL was pervasive...... not to mention that nearly every
> exposed metal surface was pitted from HCL acid that formed the moisture in
> the air...!
> this has not happened with regular PVC.
> Robert
>
>
>
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