Hydrocarbon resins creep

HDPE pipe is used in low pressure applications for transporting potable water, gas, acids, liquid hydrocarbons, oils, salt water, and other chemicals and solvents. Long-term load bearing, or creep, tests are essential to determine the life of PE pipe under pressure. HDPE pipe withstands pressures in short-term burst tests that are several times greater than long-term burst pressures because of the creep phenomenon. Broad molecular weight distribution resin, as obtained from chromium oxide catalysts, are ideal for most pipe applications. The introduction of superior, bimodal type, pipe resins in recent years has extended HDPE pipe applications. 

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