| http://www.w3.org/ns/prov#value | - Hence, the use of carbon dioxide as a component of the blowing agent is only a preferred feature, even in the case of a polyurethane foam, and the use of 1,1-difluoroethane as physical blowing agent, in the absence of precursor, i.e. as sole blowing agent, is thus an option arising as the remaining alternative within the disclosure of D1.5.6.3.3.
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