rap id m ethod for t he estimation of natural r ubber in vulcani zates of GR-S a nd nat ura l rubber by m eans of infra red spectrosco py is reported . Sampl es were carefully prepared to co ntal!1 known amou nts of .natural and GR-S rubber; the samples 'ere v ulcan ized, extracted wL t h acetone, and dn ed III a vac u um oven. Specim ens from eac h sam ple were pyr olyzed in a combu st ion furn ace at 550 0 C. and the liquid pyrolyzates were a nalyzed by mfra red absorptLOn spectroscop y . An e mpLL"lcal relationship was de veloped in which thc band in te nsit ies at 11.02 a nd 11.25 mi crons were r elated to natural rubber content . Th e exp erimental error of .the m ethod is characterized by a stand ard deviation of a s ingle d etermln atLO n of 0 .023, 'hlCh represe nts a pprox imately 3-percent nat ural rubber.
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Tryon et al. (1955) studied this question.