Methylene chloride (MCL) is a common blowing agent used in the production of polyurethane foams. It functions by generating gas when mixed with polyol and isocyanate components, leading to the formation of foam. MCL is valued for its high volatility, which allows for efficient foam expansion and cell formation. It is widely employed in various industries, including construction, automotive, and insulation, to create lightweight and insulating polyurethane foam products. Additionally, MCL is favored for its relatively low boiling point and compatibility with polyurethane formulations, contributing to its widespread use as a blowing agent.