When the du Ponts began to manufacture artificial rubber three years ago, they doubted that its use in tires would be worthwhile before the next U. S. war. In that case the price of natural imported rubber might rise above the $1.15 per Ib. it attained shortly after the last war, thereby making Duprene, trade name for artificial rubber, a profitable commodity at $1 per Ib. Meanwhile only a few manufacturers with special needs could afford Duprene.
The long-sighted du Ponts, however, took no chance that Duprene might not be a perfect substitute for rubber tires. Secretly they...
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