Recent Developments Using Phosphorlts-Containing Diol as a Reactive Combustion Modifier for Rigid Polyltrethane Foams-Part Iii

FR-D, a new phosphorus-containing diol has, previously, been demonstrated to be an effective combustion modifier in producing pour-in-place rigid urethane foams meeting ASTM E-84 Class I and Class II requirements. Continued developmental efforts led to optimized Class I and Class II foams which contain significantly less amount of combustion modifiers and are thus more cost effective than those reported earlier. FR-D is also suitable for spray foam applications because of its high chemical reactivity and high hydroxy number (#OH = 460). In this paper, recently developed FR-D based Class I and Class II pour as well as spray formulations along with their processing characteristics, E-84 data and foam physicals are discussed.