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NaMBT 50% is a 50% aqueous solution of sodium-2-mercaptobenzothiazole (NaMBT).  NaMBT 50% is used as a corrosion inhibitor to protect copper and copper alloys.  The product is also used in aqueous and glycol based liquids (antifreeze products), cooling water and metalworking fluids.

NaMBT was formerly known as  Preventol® CI 4