| http://www.w3.org/ns/prov#value | - Preferably, in the present invention they are present in amounts of from about 1 to about 2 parts.Other optional ingredients which can be added to the formulations of the invention include discoloration and aging inhibitors, flame retardants, pigments, such as carbon black, colorants, and the like.Production of the PU foams of the invention can be achieved by use of conventional foam-making machin
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