Chemical suppression brokers, such as halocarbons or halon substitutes, interfere with the chemical chain response of fire, correctly extinguishing flames without leaving residue or damaging property.
Broadly Talking, https://patch.com/north-carolina/raleigh/classifieds/gigs-services/467764/safeguarding-lives-and-property-all-american-fire-protections-quarter-century-of-excellence