'Dk-540' is a microbicide/microbistat. Its Federal EPA registration number is: 44154-6. It was originally approved by EPA on 08 Jul 1986. Its registration got cancelled on 10 Oct 1989. It has a 'Danger' signal word. It has the following active ingredients: Methanesulfonothioic acid, S-(2-hydroxypropyl) ester. It's approved for 1 sites including cooling tower water. It is also approved for 1 pests and pest groups including but not limited to slime-forming bacteria.