Methodology to Evaluate Oxidation Degradation of High-Density Polyethylene Corrugated Pipe Resin

A methodology is presented to evaluate the oxidative degradation of compression-molded samples made from high-density polyethylene corrugated pipe resin. The test samples contained 2.5 wt% of carbon black and an antioxidant (AO) package that consisted of 0.05% Irganox 1010 and 0.1% Irgafox 168. Samples were incubated in forced-air ovens at temperatures of 65°C, 75°C, and 85°C (149°F, 167°F, and 185°F) and in a water bath at 85°C (185°F). The...