Flame retardants are materials that inhibit or resist the spread of fire. These can be separated into several categories: Minerals such as asbestos, compounds such as aluminium hydroxide, magnesium hydroxide, hydromagnesite, antimony trioxide, various hydrates, red phosphorus, and boron compounds, mostly borates. Tetrakis(hydroxymethyl)phosphonium salts, made by passing phosphine gas through a solution of formaldehyde and a mineral acid such as hydrochloric acid, are used as flame retardants for textiles. Synthetic materials, usually halocarbons.

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