Time-of-flight secondary ion mass spectrometry spectra (positive ion) of 25 different polymers are presented. The presented spectra are primarily semicrystalline thermoplastic polyolefins and elastomeric polyolefins, but include several other commonly used homopolymers and copolymers. The spectra data set includes: high-density polyethylene, polypropylene, ethylene-propylene rubber, poly 1-butene, ethylene-butene copolymer, poly 4-methyl 1-pentene, poly 1-hexene, ethylene-vinyl acetate copolymer, polyisobutylene, butyl rubber, brominated polyisobutylene 4-methylstyrene rubber, ethylene-methyl acrylate copolymer, polybutadiene, polyisoprene, natural rubber, polychloroprene, polystyrene, styrene-butadiene rubber, and poly 4-methylstyrene, polyethylene glycol, polyethylene terephthalate, and polytetrafluoroethylene. These spectra can be used for the comparitive identification of unknown polymers. © 2007 American Vacuum Society.