INFLUENCE ON TIRE LIFETHE first scientific paper on Butyl rubber was presented at the 100th meeting of the American Chemical Society in September 1940 by Frolich. Since that time numerous publications (1-18) have described the properties and compounding technique of this polymer.Although Butyl has been referred to as a specialty rubber, it can also be used to replace natural rubber in many applications.Butyl was found to be a remarkable barrier to the passage of gases (10), in-
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