Test Grade PVC Plate is the test substrate specified in GB/T 9780-2013 Test Method for Stain Resistance of Architectural Coatings and GB/T 9755-2014 Synthetic Resin lotion Exterior Wall Coatings. Can replace the asbestos free cement pressure plate used for determining the wash resistance of building coatings, with a smooth matte surface and no plasticizers. In the scrubbing test, the coating is applied to the scrubbing test piece with a specific thickness, and after drying, it is scrubbed using the PS 2730 JTX-II architectural coating washable brush tester.