... ,10%H2SO4,10%NAOH,gasoline,ethanolNo color and trace changeSalt Spray Test 5%Nacl,35±2°C, ... 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