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Several thousand high boiling solvents that impart permanent flexibility to otherwise rigid plastics have been created in recent decades to supplement to relative few available in the twenties. The appearance of new types of plastics and their adaptation to new uses requiring flexibility has prompted this search. The utility of a plasticizer is judged by the performance characteristics of the resin or plastic to which it has been added. This indirect test on the plasticizer implies that its properties are uniform. In fact, producers place great emphasis on quality, and the properties determined and methods used are of equal importance to his customer.