VERZONE TT-250A is a water-soluble benzotriazole derivative, a rust preventing agent for copper and copper alloys. Its liquid form offers easy handling, excellent water solubility, and is sludge-free, providing superior corrosion inhibition in circulating water over powder products. Specifications include a yellowish-brown to brown liquid, specific gravity 1.15±0.05 (25°C), pH 8.60±0.5 (1%), and >70% effective ingredient. It is used at 0.1-2.0% in water treatment agents, metalworking fluids, and cleaners for copper protection, packed in 20 kg tin cans.