Profile: Arch Chemicals, Inc. supplies biocides. Our product cosmocil™ is an antimicrobial agent used for the preservation of personal care products against spoilage. It is based on the active agent polyhexamethylene biguanide hydrochloride (PHMB). Our product proxel™ is a preservation package for industrial water-based products. They are available as dispersions, solutions and pastes in a wide range of strengths and can be formulated in many different ways to meet customer needs. They are designed to be effective against bacteria, fungi & yeasts.