Test For PEX-C Pipe And PERT Pipe Temperature Resistance & Memory. At The Same Time Test, Less Than 2 Minutes, The Ordinary PERT Pipe Melts And Pulls Of, Ruptured. PEX-C Pipe Continues To Be Heated To Translucent, And Can Be Twisted And Pulled Free Without Deformation Or Breakage, Put Into Water To Cool And Set , After Cooling And Setting, Heat Again. As Temperature Rises, The Tube Slowly Recovers.when Burnt To Translucent Again Pipe Has Been Restored To Its Original State, Continue Heating, After Pulling Vigorously To Break, The Frature Is Smooth And Beautiful.