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The growing use of plastics and other flammable synthetic materials in construction, home furnishings, and various industrial applications is creating oppor tunities for polymer compatible, thermally stable, environmentally friendly, and cost-efficient flame retar dants. New legislation emphasizing test methods that provide input for mathematical firemodeling is chang ing the focus of interest in preferred flame retardant action from simple ignition resistance to fire propaga tion and rate-of-heat release. These factors together with concerns about combustion product toxicity and corrosivity, long-term worker exposure, and manufac turing waste minimization are creating product param eters uniquely met by various phosphorus compounds. The best phosphorus compounds for both new and existing applications will be significantly different from those compounds in the marketplace today. This paper will describe some new compounds and the driv ing forces defining the product parameters that will challenge phosphorus chemists for the next decade.Flame retardants are an important commercial end use for organophos phorous comp ounds. Many opportunities exist for organophosphorus

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