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.