HCFC 141b and HCFC 142b are potential alternative foam blow ing agents for the fully halogenated CFCs 11 and 12. A lack of available infor mation has prompted a study of the flammable characteristics of these alter natives. This paper presents the results of flammability limit testing according to ASTM E-681-85. The effects of temperature, humidity, ignition source, and volume of apparatus are discussed. Other flammability properties, such as heat of combustion, minimum ignition energy, autoignition temperature, and maxi mum rate of pressure rise, are compared to more common flammable materials.
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