Master Flame is a water-based, non-toxic Class "A" Flame Retardant for wood, fabric, drywall, and other absorbent materials. It absorbs into surfaces and creates a protective barrier that stops flames from spreading and inhibits the development of toxic smoke. Independently tested to NFPA 701, ASTM E-84, and California Title 19, Master Flame doesn't just meet the standard, it exceeds it.