Form: This specification covers polyurethane systems consisting of an isocyanate component and other components containing a polyol and other ingredients which@ when mixed and cured@ produce thermosetting@ rigid@ cellular products. Application: Primarily for foam-in-place applications such as electronic encapsulating or miscellaneous packaging for use from -70??o +105??(-95??o +225??. Classification: The resin system is classified by density of the cured product as shown in Table I wherein each material is defined by nominal bulk densities of foam in the range 2 - 26 lb per cu ft (32 - 416 kg/m?) in increments of 2 lb per cu ft (32 kg/m?).