Originally Posted by
Darrel Hood
However, just for knowledge, there is no difference in the plastic formulation for the two products (white PVC and gray conduit) except that carbon black is added to make the white pipe gray.
There must be more difference than just that as there are differences in their physical properties - electrical PVC is not as strong (comparing Sch 40 to Sch 40) as plumbing PVC ... I always presumed this was because plumbing PVC is tested to hole pressure and electrical PVC is not.
Electrical PVC just seems a lot 'weaker' than plumbing PVC - try to cut or nick each, the electrical PVC cuts and nicks much easier, it also seems more flexible size for size and length for length.
Electrical is sunlight resistance and that is due to adding the carbon black, but surely there must be some other formulation differences?