... needle crystal BTA, columnar BTA, tablet BTA and liquid BTA. 1,2,3 benzotrazole(BTA)Properties:It is solved slightly in ... excellent corrosion inhibitor for various metals, such as copper and silver, etc, but also a superior ultraviolet absorber. ... industry, petrochemical industry and dyeing industry.Columnar and tablet BTA is produced through the mechanical shaping and trimming from the crystal ...