Overlap both ends in the long direction of the test piece with PVG film facing outside, insert an area of 5 mm to be clamped by a test piece holder, and install it to the cold resistance tester of the clamp so t the fold of the test piece is at the center of the anvil. After five minutes, push button ta release the catch of the stand. Immediately after the falling weight is d remove the weight take the test piece out of the holder, and check for cracks or breaksge.