Cyclopentane is a colorless, water-insoluble liquid, C5H10, obtained from petroleum and used chiefly as a solvent.

Cyclopentane and blends are basically used as a blowing agent for the replacement of HCFC 141B for rigid polyurethane.

• used in the manufacture of synthetic resins and rubber adhesives
• used in refrigeration Industry such as Freon-free refrigerators and freezers
• used in construction Industry such as rigid polyurethane insulated panels and boards
• as octane booster high performance fuel like Formula 1 racing car fuels
  

Cyclopentane has found applications in various industries. As a volatile hydrocarbon it is an incidental component of some fuels and blowing agents. In recent years, cyclopentane has been used as a refrigerant to replace chlorofluorocarbons (CFCs) and hydrofluorocarbons (HFCs) as it does not deplete the ozone layer and has a much lower global warming potential than HFC refrigerants. Cyclopentane requires safety precautions to prevent leakage and ignition when used as a refrigerant as it is highly flammable.