Development and Evaluation of Practical and Self-Help Fire Retardants.

摘要

A study was conducted (1) to improve surface penetration of the retardant formulations for existing wood roofs and to evaluate the retardance efficiency of the resulting thermal hardening procedures,and (2) to investigate practical ways of incorporating retardants into nylon and dacron polyester (polyethylene terephthalate) carpets. Magnesium ammonium phosphate sprayed on and interstitially precipitated in existing wood roofs provides at least a Class C fire protection rating that should withstand weathering for at least five years. This self-help treatment is effective if the component chemical solutions are applied to roofs that are at least 5years old. The depth of retardant penetration increases with the age of the roof. The guidelines,derived from the Parker-Lipska arithmetical expression for choosing effective retardants,can be applied to cellulosics in general. A 20% NH4Br solution was applied to both the nylon and dacron polyester carpets and was found to prevent flame spread and to reduce the generation of toxic products. The chemical is water soluble and can be easily applied with a rug shampooer once a year.