Film impact strength and flexibility testing

1. Impact strength

The impact strength test is the ability of acid coating to resist instantaneous deformation under high-speed gravity without cracking or falling off. It comprehensively reflects the softness of the coating film and the bonding force to the substrate.

According to the provisions of GB/T1732-93, the mass of the hammer of the impact Tester is 1000g, the diameter of the concave is 15 mm ± 0.3 mm, the depth of the punch entering the concave is 2 mm ± 0.1 mm (need to be corrected), and the maximum slide of the weight is The height is 50cm, expressed in N cm. The weight and height of the impact Tester in various countries are different. Among them, IS06272-1993 is defined as a drop weight test, with a weight of 1kg and a height of 1m. The quality evaluation after the test is generally adopted Use a 4x magnifying glass to observe whether there are cracks and damages, but it is difficult to observe very fine cracks. Some use CuSo ₄ aqueous solution to wet the hole for 15 minutes, and observe whether there is copper or rust color to judge. (Related instrument: impact Tester)

2. Flexibility

According to GB/T1731-93, the flexibility Tester has a set of copper shafts with different thicknesses, which are bent at 180° to check whether the paint film is cracked or not. It is 1mn, 2mm, 3mm, 4mm, 5mm, 1omm, 15mm. The test result is a comprehensive reflection of the elasticity, plasticity and adhesion of the paint film, and is affected by the deformation time and speed during the test.

Another type of flexibility Tester is the chain bending Tester, which avoids the discontinuity of the shaft rod test results. (Related instrument: bending Tester)