Prepare test pieces in accordance with 4.4(Tensile strength and Elongation)and4.14 (Cold Resistance), hold at the specified temperature for 48 hours using Geer oven,and take it out to allow to cool to room temperature of a cryostat for cold resistance test shall be 15+ 2 C for general leathcloth and-35 2ec for leathercloth for low temperature use.