... ,10%NAOH,gasoline,ethanolNo color and trace changeSalt Spray Test 5%Nacl,35±2°C,500hours No ... front, the back of the painting, to ensure quality.2. The substrate of the chemical composition and mechanical ... coated steel coil coating thickness,gloss,pencil hardness,high impact properities and flexural properities and cross-cut ... than 10 years Whole Production Line High-quality Galvanized Roof Steel Sheet