This test method is applicable to distinguish between properly and improperly molded PVC plastic pipe fittings. It can be used to:
Determine whether cold slugs or unfused areas are present (Note 1),
Determine the amount of molded-in stress produced by the molding process (Note 2),
Reveal contamination, and
Show the quality of the weld line.
Note 1—A cold slug is a piece of material that enters the mold at a significantly lower temperature than the rest of the mass.
Note 2—A stress-free part will generally have better properties and higher strength than those with a high degree of stress. Stress-free parts will generally react better when exposed to chemicals.