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It might be well to point out, however, some of the newer developments that have taken place within the past few months which might have a bearing on the future of the various foamed plastics involved.

In urethane foams, for example, there has been a definite trend toward the polyether-type materials ( which are now available in two-component rigid foam systems ) and the emphasis is definitely on one-shot molding.

Most manufacturers also seem to be concentrating on formulating fire-resistant or self-extinguishing grades of urethane foam that are aimed specifically at the burgeoning building markets.

Urethane foam as an insulator is also coming in for a good deal of attention.

In one outstanding example, Whirlpool Corp. found that by switching to urethane foam insulation, they could increase the storage capacity of gas refrigerators to make them competitive with electric models.

Much interest has also been expressed in new techniques for processing the urethane foams, including spraying, frothing, and molding ( see article, p. 391 for details ).

And in meeting the demands for urethane foam as a garment interlining, new adhesives and new methods of laminating foam to a substrate have been developed.