This International Standard specifies methods for the determination of chlorine and/or bromine present in raw rubber, uncured mixes or vulcanizates. The methods are applicable to natural rubbers and to the following synthetic rubbers: isoprene, styrene-butadiene, butadiene, chlorinated, butyl, halogenated butyl, nitrile, ethylene-propylene, polychloroprene and epichlorohydrin.