Smolder and flame resistant insulation materials, composition and method
AssigneeThe United States of America as represented by the Secretary of Commerce
InventorRobert J. McCarter
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Abstract
A flame and smolder resistant cellulosic insulation material, method of tting loose-fill cellulosic material, and composition for imparting flame and smolder resistance to such materials are disclosed with the combination of from about 2 to 9% sulfur and from about 10 to 25% flame retardant uniformly distributed in the cellulosic insulation material based on the weight of cellulosic material.
Claims35
A flame and smolder resistant cellulosic insulation material comprising:
- a cellulosic fibrous mass of sufficiently low density to provide insulating effects,
- from about 2% to about 9% elemental sulfur based on the weight of the cellulosic fibrous mass, and
- from about 10% to about 25% flame retardant based on the weight of the cellulosic fibrous mass.
A method of inhibiting the smolder tendency of cellulosic insulating materials comprising:
- treating the insulation material with elemental sulfur in an amount between about 2% and about 9% based on the weight of the insulation material, and
- treating the insulation material with a flame retardant in an amount between about 10% and about 25% based on the weight of the insulation material.
A composition for the flame retarding and smolder inhibiting treatment of cellulosic insulation materials consisting essentially of a flame retardant compound selected from the group consisting of borax, aluminum sulfate, aluminum trihydrate, sodium silicate, sodium phosphate, calcium sulfate, magnesium sulfate, calcium dibasic phosphate and mixtures thereof and elemental sulfur in an amount of from about 15% to about 50% by weight based on the weight of the flame retardant compound.
Dependencies are inferred from the claim text.