Prepare test pieces in accordance with 4.4 and 4.14, install them on the fadeometer as specified in Table 4, and expose the film face for a specified period of time.After the exposure,teke the test pieces out and leave them to cool to room temperature. During the exposure, as a rule, the top and bottom of the test pieces shall be changed approx. every 20 as hours. After the test pieces are cooled to room temperature, perform visual test, tensile test as per4.4, and cold resistance test as per 4.14. Note that the temperature of the cryostat shall be 0+2 for general leathercloth and-10 for leatherfoth low temperapufe. use.