Test method for breaking force and elongation at break:

Type IV specimen with a width of 15 mm shall be used according to the provisions of GB / T 13022-1991. The test sample shall be cut 1 m after unwinding, and cut evenly at about equal intervals along the length or width of the sample. It is not allowed to touch the surface of the sample by hand and make marks on the sample. The inner and outer sides of each sample are separated and protected with general writing paper. The internal and external surfaces and vertical and horizontal directions of the sample shall be marked on the separation paper.

During the test, the jaw distance of the tensile testing machine is 50 mm, the gauge distance is 50 mm, and the test speed is 250 mm / min and 25 mm / min. Each group shall be formed in longitudinal and transverse directions. There shall be no less than 5 samples in each group. Take the average value, accurate to 0.1 n.