1.1 ,This test method covers an analytical scheme using the mass spectrometer to determine the hydrocarbon types present in conventional and synthesized hydrocarbons that have a boiling range of 160 ,°,C to 343 ,°,C (320 ,°,F to 650 ,°,F), 5 ,% to 95 ,% by volume , as determined by Test Method D86. Samples with average carbon number value of paraffins between C₁₂ and C₁₆ and containing paraffins from C₁₀ and C₁₈ can be analyzed. This test method is intended for use with full boiling range products that contain no significant olefin content. Eleven hydrocarbon types are determined. These include: paraffins, noncondensed cycloparaffins, condensed dicycloparaffins, condensed tricycloparaffins, alkylbenzenes, indans or tetralins, or both, C_nH _2n-10 ,(indenes, etc.), naphthalenes, C_nH_2n-14  ,(acenaphthenes, etc.), C_nH _2n-16 ,(acenaphthylenes, etc.), and tricyclic aromatics.