This standard specifies a method for the determination of the total rubbery hydrocarbon content in fluororubber using thermogravimetric analysis. It is suitable for the determination of the total rubbery hydrocarbon content in fluororubber. The method summary includes high temperature analysis under nitrogen atmosphere and oxidation under oxygen atmosphere, and the total rubbery hydrocarbon content is calculated by mass change. The reagents and materials include nitrogen and oxygen with a certain standard of purity. The required instrumentation includes Thermal Gravimetric Analyzer with platinum crucible and Analytical Balance. The analysis steps include setting the initial temperature of the Thermal Gravimetric Analyzer, cutting the sample, and performing the analysis under specific conditions.