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The characterization and chemical analysis of rubber are covered by this review. Methods are included for the identification and determination of rubber or materials in rubber. Analysis of rubber chemicals before they are added to rubber is not included.The literature on chemical analysis which became available to the authors between September 1966, the end of the period covered by the last review in the series (212), and July 1968 is covered. The section on polymer characterization by physical methods includes material up to September 1968.