QSX-20 crack resistance tester About QSX-20 anti-cracking resistance tester is developed in accordance with the "JC/T852-1999 solvent-based rubber asphalt waterproof coating standards and" JG/T157-2004 building wall putty standards 's. Can be used for determination of solvent-based rubber asphalt waterproof coating crack resistance, and the same principle of contrast test similar tests, such as building facades with putty dynamic crack resistance, such as testing. The main technical parameters: 1. Determination test plate: 200 × 150mm, the maximum thickness of 14mm top knife blade geometry: triangle. Working way: manually.