1 .1 This International Standard describes two methods for the detection and identification, by thin layer chromatography, of antidegradants (antioxidants, antiozonants and stabilizers), which may be present in raw rubber, unvulcanized compounded rubber, or rubber products. Method A is a simplified method, based on a single solvent system, which provides for the identification of known materials and may be used to check the presence or absence of a particular antidegradant which should be present. Method B is a more detailed method, using additional solvents and sprays, which enables a greater degree of separation of the spots to be obtained and therefore may be used to detect and identify an unknown antidegradant. 1.2 Antidegradants to which these methods are applicable include phosphited polyalkyl phenols, substituted bisphenols, secondary amines, substituted cresols and substituted p-phenylenediamines. Examination for other types of antidegradants is possible, provided that the requirement of 11.1 is met.