The Acid and Alkali Resistance Test involves immersing a specimen in an acid or alkali solution of a specific concentration for a prescribed duration. Upon removal, changes in color difference and gloss are evaluated, as is the presence of phenomena such as coating blistering or detachment.
Furthermore, the specimen is assessed in accordance with standard GB/T 1766 to determine its ratings for gloss loss, discoloration, blistering, and detachment.
The Neutral Salt Spray Resistance Test subjects a specimen to exposure within a neutral sodium chloride salt spray atmosphere for a specified period, after which its surface is evaluated for blistering, rust grade, and the extent of corrosion creep.
The Atmospheric Exposure Test evaluates the aging performance of the coating on color-coated steel sheets-specifically regarding gloss loss, discoloration, chalking, blistering, rusting, and cracking-following a period of natural atmospheric weathering.