1,Wipe the test plate and the loading plate with cleaning material, and then dry it carefully with clean gauze, and wash it repeatedly more than three times until the work surface of the board is cleaned by visual inspection. After cleaning, no hand or other object contact plate shall be used on the working surface.

2,At a temperature of 23 °C ± 2 °C and a relative humidity of 65 % ± 5 %, the specimen is pasted in parallel to the longitudinal of the plate in the middle of the test plate and loading plate at the dimensions specified in Figure 2. Roll pressure on sample at a speed of about 300 mm/min. Note that when rolling, only the force produced by the quality of the roller can be applied to the specimen. The number of rolls can be specified according to the specific product situation, or if there is no regulation, the rolling pressure can be repeated three times.

3,After the specimen is pasted on the plate, 20 min should be placed at a temperature of 23 °C ± 2 °C and a relative humidity of 65 % ± 5 %. Then the test plate is fixed vertically on the test frame, and the loading plate and weight are gently connected with the pin. The whole test frame is placed in a test tank adjusted to the required test environment. Record the start time of the test.

4,After arriving at the specified time, remove the heavy weight. Using a magnifying glass with fractional degree, the displacement of the sample was measured to 0.1 mm; Or record the time when the specimen has fallen off the test plate. The number of times is greater than or equal to 1 H in min and less than 1 H in S.