is a cheap blowing agent, which produces low
density foams with low thermal conductivity and good
properties. However, the investment to handle a flammable
blowing agent is not always justifiable, especially for small foam
producers. In most cases, pentane is added to the polyol
blend at the customer’s premises to avoid the transportation
of a flammable polyol blend. In continuous operations
(lamination), pentane is added in line, just before the mixing
head. In discontinuous operations, pentane is pre-blended
to the polyol blend with suitable equipment.