(hĕp′tə-mĕth′əl-nŏn′ān′, -nō′nān′)
Any of a group of hydrocarbons, C16H34, having seven methyl groups on a nine-carbon chain.
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The IQT calibration development work also used HMN (Heptamethylnonane also called isocetane) as the CN15 reference, as well as n-hexadecane as the CN100 reference.
Primary reference diesel (PRF) fuels were blended from 99+% pure HMN (Heptamethylnonane or isocetane: CN = 15) and 99+% pure normal hexadecane (CN = 100).
Phase A Polyglyceryl polyricinoleate 4.0 Heptamethylnonane 10.0 Mineral oil 10.0 C12-15 alkyl benzoate 7.0 Phase B Diglycerin 4.0 Sodium chloride 1.0 Preservatives q.s.
and Mueller, C.J., "Liquid Penetration Length of Heptamethylnonane and Trimethylpentane under Unsteady in-Cylinder Conditions," Fuel 89(10):2673-2696, 2010, 10.1016/j.fuel.2010.04.024.