Rubber, raw styrene-butadiene, emulsion-polymerized. Determination of bound styrene content. Refractive index method1 Scope This document specifies a method for determining the bound styrene content of emulsion polymerized styrene butadiene rubbers (SBR) by correlation with the measured refractive index of an extracted sample according to a table of refractive indices versus percentage mass fractions styrene. The method is also applicable to extracted oil extended emulsion polymerized SBR as long as it produces a film suitable for refractive index measurements. It

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