Abstract
Abstract A greatly improved method for using Iodine-125 is described—one which permits precise, rapid, and convenient measurements of treadwear during road tests of considerably greater mileage (up to 1500–2000 miles) than reported by earlier workers. A highly reproducible laboratory calibration procedure has been developed and very close agreement between calibration curves and actual road test data is demonstrated for automobile tires in four specific treadstock cases: SBR, SBR/BR, NR, and NR/BR. Only a small percentage of the tread surface is tagged with I-125, which is employed at very low activity levels. The tagging procedure has been modified for much greater I-125 tread penetration, and has been simplified, shortened, and standardized for use by ordinary tire test personnel. It is also applicable to non-tire rubber products.
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