Renovation # 1988 Bath
A process has been developed to produce bioriented PVC pipes. Due to the biorientation process, the long term strength has been increased by a factor 2. This means that the design stress of bioriented PVC pipes can be twice of normal extruded PVC pipe. The long term stiffness Of the bioriented pipe has been increased by 508. The resistance to stress cracking (crazing) is improved very strongly. Even in very agressive media, no crazing will be initiated. This means that there will be no risk of premature brittle failure, giving this bioriented pipes much more safety in practice.