Open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead. Synonyms: ambiguous; equivocal. Context examples:
Polypropylene is stronger that polyethylene. High resistance to environment. Have higher melting point. The chemical reason is that polypropylene have triple bond carbon. However, polyethylene have only double carbon bonded to each other. 8 people found this useful.
The major difference between these pipes is basically the difference in material and there properties. PVC, CPVC, UPVC and HDPE are non metalic pipes. They are made from thermoplastic materials. These fall under the category of Plastic pipework. Both pipes and fittings are available in these materials.