Both the inside and outside surfaces of the plumbing should be smooth,without crack,blowhole,peeling,or severe cold spots,visible impurity,unidentical color,discoloration and other defects,The color is either gray or white.
3
Specifications(outside diameter,wall thickness)
On gauge
4
Density
13501460
5
Veika softening temperature
72
6
Hydroscopic property
40
7
Oven test
The sample should have no blisters,cracks or edge joint line cracking phenomena.Defect is allowed within 50% of wall thickness around the injection point.Cracking phenomena are allowed within the whole wall thickness at the edge joint.