This International Standard specifies a method for the determination of the tendency of plasticizers to migrate from plastics in which they are contained into other materials or other plastics when they are brought into close contact. NOTE 1 - The surfaces into which the migration may proceed may also consist of organic surface coatings, such as lacquers. IS0 293 : 1986, Plastics - Compression moulding test specimens of thermoplastic materials. IS0 294 : 1975, Plastics - Injection moulding test specimens of thermoplastic materials. IS0 4649 : 1985, Rubber - Determination of abrasion resistance using a rotating cylindrical drum device. 3 Definition This test is suitable a) for evaluating the tendency displayed by plastics, particularly in the form of films and sheets, to lose certain of their liquid constituents when they are brought into contact with materials that have an affinity for plasticizers; b) for studying the tendency to migrate of plasticizers contained in a resin or a series of resins, in one or more concentrations. In case b), standard compounds should be prepared on the basis of a well characterized resin with well defined ratios of plasticizer to resin. NOTE 2 - When the absorbent sheets themselves contain a substance capable of migrating, simultaneous migrations may occur from the test specimens into the absorbent sheets and vice versa. The results may also be affected by the migration of other constituents of the plastic material (for example oligomers) or by the loss of any volatile constituents other than plasticizers from the plastic material or the absorbent layer.