Formic Acid Cas 64-18-6 Wholesale Formic Acid China (HCOOH) is a colorless, volatile liquid that is the simplest carboxylic acid. It is naturally present in the sting of ants and in the secretion of certain insects. Formic acid chemical is widely used as a preservative and antibacterial agent in the food industry, as well as a feed additive for livestock. It is also used in the production of dyes, plastics, and rubber and as a cleaning agent in the leather and textile industries. Formic acid formic acid has a strong, pungent odor and is highly corrosive and toxic. It should be handled with care and used only in well-ventilated areas with appropriate protective measures in place.