BS ISO 7725:2020 pdf free.Rubber and rubber products - Determination of chlorine and bromine content. BS ISO 7725 This document specifies methods for the determination of chlorine and/or bromine present in raw rubber as well as vulcanized or unvulcanized rubber compounds.The methods are applicable to natural rubbers and to the following synthetic rubbers: isoprene,styrene-butadiene, butadiene, butyl, halogenated butyl, nitrile, ethylene-propylene,...