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The term slow crack growth (SCG) resistance is an important parameter for the HDPE material.
The outstanding resistance to slow crack growth together with the scratch resistant protective layer withstands the toughest installation conditions.
According to PPI, the spoolable composite pipe structure using PE 4710 allows for the maximization of pipe performance in a system, bringing an excellent level of slow crack growth resistance and enabling 10 a piping system to be operated at high pressure without sacrificing safety or service life.
The reduced fracture toughness was due to slow crack growth from water vapor in the air.
A typical example is PE100, which is of bimodal molar weight distributions, where the low molecular weight gives stiffness and good processability and the high enhances resistance to slow crack growth (SCG) (3).
The key difference between the two resins, which was related to the slow crack growth failure of the HDPE in the part from the offshore supplier, was identified through [sup.
Callaway found it particularly well suited for power plant applications such as ESW pipe systems, which require long-term hydrostatic strength, outstanding resistance to slow crack growth and excellent performance at elevated temperatures such as 176 degrees Fahrenheit.
The report then reviews international standards for PE pipes and fittings, describes accelerated testing for slow crack growth resistance, and examines methods for predicting long-term slow crack growth failure.