Abstract: Compositions comprising a finely divided cellulosic material and an amount of a latex containing magnesium oxychloride and/or magnesium oxysulphate effective to impart water and fire resistance to the cellulosic material are disclosed. Methods to make a water and fire resistant product are also disclosed.

Abstract: Compositions comprising a finely divided cellulosic material and an amount of a latex containing magnesium oxychloride and/or magnesium oxysulphate effective to impart water and fire resistance to the cellulosic material are disclosed. Methods to make a water and fire resistant product are also disclosed.

Abstract: A novel, non-combustible thin coating, applied as an air-setting paint, is used to form a coherent fire-barrier on or between susceptible wood or plastic substrates, or other substances. Consisting of a paint-like slurry of three separate but compatible and mutually synergistic co-bonding systems, viz. magnesium "oxychloride" cement, plus high alumina mono-calcium aluminate cement, plus colloidal silica dispersed in dimethyl formamide (DMF), and utilizing an aqueous solution of magnesium chloride as the common hydrating fluid for the two cements, the coating retains its structural integrity through prolonged exposure to flame temperatures of 2000.degree. F. The coating takes advantage of its brilliant whiteness to act as a thermal radiation reflector for the high radiation component of most flames.