1、The instrument should be tested under the conditions of 23 + 2 C and relative temperature (50 + 5)%, except for the other requirements. The instrument should be operated on (or fixed on) the instrument platform.

2、The sampling was carried out according to the GB3186 - 82 "sampling of paint products", and the special samples were checked and prepared according to the GB1727 - 79 "general preparation method of paint film".

3、Test plate

（1）Material and size

  Unless otherwise specified or agreed, test plate shall comply with GP9271 - 88 "paints and varnishes standard test board" requirements, and should be polished polished steel plate, tin plate or soft aluminum.

   The plate should be smooth, no deformation, the surface should be free of any bulge or crack visible, test plate is 100mm*180mm, the maximum thickness is 0.8mm, if not deformation test plate in coating and drying after cutting, if it is aluminum, the long side should be vertical and metal rolling process in parallel (axial).

（2）The treatment and coating of the test plate

   Except as otherwise stipulated, three pieces of test board should be prepared according to the rules of GB1727 - 79 "general preparation of lacquer film". If the brush is used, the brush mark should be parallel to the short side of the sample.

（3）Drying and drying conditions

According to the time required for drying (or bake hardening), each coated sample plate is placed. Then the test sample is placed at 16h at 23 + 2 degrees C and relative temperature 50 + 5%, and at least, the test is carried out as soon as possible.

（4）Film thickness

 The thickness was measured by GB1764 - 79 film thickness measurement.

• QTZ Conical Mandrel Tester Film Flexibility InstrumentX1