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Polymers can be indexed on the basis of the monomers from which they are formed or on the basis of their actual structure as represented by a structural repeating unit (SRU). Since the primary literature does not always provide sufficient information on actual structures, all polymers are indexed in the CA volume indexes and registered in the CAS Registry System on the basis of their monomers.All specific homopolymers, copolymers, and polymeric reaction products are indexed separately at every component in both the subject and formula indexes. Additional entries based on the new polymer rules of the American Chemical Society are made in both the subject and formula indexes and the CAS Registry System for polymers whose structures are well defined or can be clearly assumed.