Cyclopentane (C5H10) is a high-purity, colorless hydrocarbon liquid with a mild gasoline-like odor, featuring a boiling point of approximately 49°C and CAS No. 287-92-3. This highly flammable compound is widely used as a blowing agent for rigid polyurethane foam in insulation applications such as refrigerators, freezers, and industrial systems. As a sustainable alternative to CFCs and HCFCs, it offers zero Ozone Depletion Potential (ODP) and very low Global Warming Potential (GWP), significantly enhancing thermal insulation performance and energy efficiency. Due to its flammability, it requires handling in explosion-proof areas and closed systems with static electricity control, with detailed safety measures outlined in its Safety Data Sheet.