| http://www.w3.org/ns/prov#value | - However if the amount of water is not sufficient to obtain the desired density of the foam any other known way to prepare polyurethane foams may be employed additionally, like the use of reduced or variable pressure, the use of more conventional blowing agents like chlorofluorocarbons, hydrofluorocarbons, hydrocarbons and fluorocarbons, the use of other reactive blowing agents, i.e. agents which r
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