... acid, saturated calcium,10%H2SO4,10%NAOH,gasoline,ethanolNo color and trace changeSalt Spray Test 5 ... front, the back of the painting, to ensure quality.2. The substrate of the chemical composition and ... coated steel coil coating thickness,gloss,pencil hardness,high impact properities and flexural properities and cross- ... than 10 years Whole Production Line High-quality Galvanized Roof Steel Sheet