This International Standard describes a procedure for the determination of the following antidegradants in raw synthetic rubbers: - N-alkyl-N'-phenyl-p-phenylenediamine; - N-aryl-N'-aryl-p-phenylenediamine; - poly-2,2,4-trimethyl-1,2-dihydroquinoline. Extender oils, when present, can interfere. The method, with modification if necessary, can be applied to the determination of other amine antidegradants.