Re: PVC/CPVC fumes hazards was(Out of round PVC)

                            in regards to fumes emissions from heating PVC
and cpvc........
HCL gas is the main (but not only!) nastiness that results from thermal
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.