Dimensional &
visual Inspection.
Tensile Strength at yield & Elongation at break.
Reversion.
Environmental Stress Crack Resistance.
Impact Strength.
Crush Resistance.
Oxidation Induction Time (Thermal Analysis).
Hydraulic Characteristics.
Internal Coefficient of Friction.
Density of the inner layer.
Thickness of the inner layer.
Suiphated Ash content of the duct.
Fading of colors of ducts.
Pulling force on duct joined by coupler.
M.F.I of duct.
Density of duct.
Wall thickness.
Opacity.
Vicat softening temperature.
Resistance to external blow at 00C temperature
Effect on water
