Cyclopentane is principally used as a blowing agent in foam manufacture, forming an excellent substitute for CFCs. It is recognized by environmental groups as having zero ozone depletion potential, making it a superior alternative to HCFC 141-b. The high stability of Cyclopentane blown foams also yields performance benefits over CFC 11 foams, even in regions where these are still permitted to be used. Cyclopentane and Cyclopentane 70 are particularly suitable for use in insulating foams, home refrigeration appliances, insulation panels, boards and pipes for the construction industry. Cyclopentane 70 is a mixture of 70% cyclopentane and 30% isopentane and differs from the pure cyclopentane grade mainly in its vapor pressure.