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Title: Comparative Toughness Of Polyethylene Pipes
Author: Benny E. Nasser
Source: American Gas Association 1986
Year Published: 1986
Abstract: The relative lougtiness of seven PE-3408 pipes was measured in three tests compressed ring ESCR, MTS Impact, and Battelle slow crack growth. It was found that the ring ESCR test detected basic ESCR differences between the samples, while the Bell ESCR test was unable to differentiaie between the samples. MTS Impact demonstrated that pipe impact strength increases as temperatures decrease to -40C. This contrasts with Izod impact measurements, which showed decreasing impact with decreasing temperature. The Battelle slow crack growth test indicated that great differences existed between samples extruded from the same resin with respect to induction period while the crack growth rates were similar. Several samples showed little or no crack growth after several hundred hours on test. Considerable work remains to be done in order lo fully understand the significance and value of the Battelle slow crack growth test.

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