The necessity of constant temperature and humidity test chamber for product humidity testing


Next: GB13022 Plastics. Test method for tensile properties of films The GB13022 standard specifies the tensile property test methods for plastic films and sheets. The GB13022 standard applies to plastic films and sheets with a thickness less than 1 mm. Not suitable for reinforced thin film microporous sheets and membranes. Testing instrument recommendation: ETT-AM material testing machine 2Test equipment 2.1 Any testing machine that can perform tensile testing and meet the requirements can be used. 2.2 The testing machine should be equipped with appropriate clamps. The clamps should not cause the specimen to break at the clamps. When any load is applied, the clamps on the testing machine should be able to be immediately aligned in a line so that the long axis of the specimen is aligned with the length of the specimen passing through the clamps. The stretch directions of the center lines coincide. 2.3 Test The moving speed of the fixture should meet the specified requirements. 2.4 Test: The machine indication value is between 10% and 90% of the full value of the recorder (or the full scale of each level dial), and the indication value error should be within ±1%. 2.5 The instrument for measuring thickness should comply with the requirements in GB 6672. 3 samples 3.1 Sample shape and size This method specifies the use of four types of specimens. Type 1.I.01 is a dumbbell-shaped specimen. See Figures 1 to 3. Type Iv is a long specimen with a width of 10~25 mm, a total length of not less than 150 mm, and a gauge length of at least 50 mm. 4. Test steps 4.1 Use a measuring tool with flat upper and lower sides specified in GB 6672 to measure the thickness of the sample, and use a measuring tool with an accuracy of 0.1 mm or more to measure the width of the sample. The thickness and width of each sample should be measured at three points within the gauge length, and the arithmetic mean value should be taken. The thickness is accurate to 0. 001 mm, and the width is accurate to 0.1 mm. The width of the parallel part in the middle of the dumbbell-shaped sample can be the average width of the corresponding part of the punch knife. 4.2 Place the sample in the two clamps of the testing machine, so that the longitudinal axis of the sample coincides with the line connecting the centers of the upper and lower clamps, and it should be appropriately tight to prevent the sample from slipping and breaking in the clamps. The clamps should be lined with rubber. class of elastic materials. 4.3 If an extensometer is used, before applying stress, the measuring points on both sides of the extensometer should be adjusted to match the gauge length of the specimen. The extensometer should not subject the specimen to load. 4.4 Start the testing machine to conduct the test at the specified speed. 4.5 After the sample breaks, read the required load and the corresponding elongation value between the marking lines. If the sample breaks outside the marked line, the sample shall be discarded and another sample shall be taken and remade.