This standard specifies a unified method for determining the coefficient of friction of plastic films and sheets. The method is primarily used for quality control, assessing the slipperiness and processing suitability of films by measuring the static and kinetic friction forces when they come into contact with their own surface or other materials. The standard applies to non-adhesive materials with a thickness not exceeding 0.5 mm. The core testing instrument for implementing this standard is a dedicated coefficient of friction tester, which can fix specimens, apply standard loads according to specified procedures, and accurately measure the changes in force during the initiation of sliding and stable sliding, thereby calculating the corresponding static and kinetic coefficients of friction.