This tester is used for measuring the heat-endurance and pressure resistance of sheathing of the cord. Testing method is to put the specimen upon a testing stand inside a constant temperature chamber which is predetermined at 125±2℃, and pressed with a ball end in diameter 5 mm for one hour; afterwards take out specimen and put it into cool water for 10seconds.then measure its depth of concavity, It will be qualified if the depth is within 2 mm.
