Benzotriazole (CAS 95-14-7): The Quiet Additive That Keeps Copper Bright, Antifreeze Honest, and Plastics From Fading
A practical supplier guide to benzotriazole (CAS 95-14-7, C6H5N3, MW 119.12, EINECS 202-394-1): the white-to-beige heterocycle that passivates copper and multi-metal surfaces, protects antifreeze and closed-loop cooling water, stabilizes polymers against UV fading, and acts as a photographic anti-fogging agent. Covers the bond-and-film protection mechanism, form/scale-inhibitor pairings, and what buyers should check on the spec sheet, with natural links to sarcosinate corrosion inhibitors, citric acid scale control, and lecithin emulsifiers.
