Slow Crack Growth

Slow crack growth (SCG) fractures are a major cause of in-field failures. The main characteristics of this type of failure is the stable growth of a crack with little deformation in the plastic material. SCG testing determines the susceptibility of resins to slow-crack-growth when tested in an accelerating environment and can be done through a number of test methods which are applicable to polyethylene (PE), polypropylene (PP) and polybutylene (PB) piping.

Compared to slow-crack growth failures, Rapid crack propogation (RCP) is a fast fracture type of failure. Characteristics for this type of failure include a smooth fracture surface but cracks extending over longer distances. This type of failure is evident in pressure installations and can be caused by various factors including material, temperature, size and installation.