Cetylpyridinium chloride (CPC) is a quaternary ammonium salt antiseptic that is used in many over-the-counter personal-care products mouthwashes, toothpastes, lozenges, and breath and nasal sprays, to name a few. It is also used in topical anti-infective products and as a pharmaceutical preservative.
(1-Hexadecyl)pyridinium chloride monohydrate is used in a study to assess removal of emulsified oil from oily waste water and removal of emulsified food and mineral oils from waste water. And it is used for detergent-based extraction of membrane-associated enzymes such as alkaline phosphatase, and in extraction of chromium and palladium.
Store away from strong oxidizing agents. Keep container tightly closed. Store in cool, dry conditions in well sealed containers.