1-Chloro-1,1-difluoroethane, widely known by its synonyms such as HCFC-142b, R-142b, and Freon 142b, is a significant haloalkane in the chemical industry. With the chemical formula C2H3ClF2 and a molecular weight of approximately 100.495 g/mol, this compound is characterized by its transparent, colorless liquid or gaseous appearance and a nearly odorless nature.

Its physicochemical properties include a boiling point around -10 °C and a melting point of approximately -131 °C. It exhibits a density of 1.108 and a refractive index of 1.316. While generally stable, 1-Chloro-1,1-difluoroethane is highly flammable and requires careful handling. It is incompatible with strong oxidizing agents and certain metals, necessitating the use of specific equipment like brass regulators and steel cylinders for safe storage. Optimal storage conditions involve a ventilated, low-temperature, and dry warehouse, separate from oxidants to prevent adverse reactions.

Historically, 1-Chloro-1,1-difluoroethane found extensive use as a refrigerant and as a blowing agent in the production of foam plastics. It was also employed as an aerosol propellant in topical pharmaceutical formulations. However, due to its significant contribution to ozone depletion and its potent global warming potential, its use in many traditional applications has been phased out under international protocols. Despite these restrictions, 1-Chloro-1,1-difluoroethane remains a critically important compound, primarily serving as a feedstock in the synthesis of polyvinylidene fluoride (PVDF), a high-performance fluoropolymer used in various demanding applications.

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