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Aviation Gasoline - Content

Aviation gasoline/avgas is required to be an all hydrocarbon product. That is, its components must be chemicals that contain only carbon and hydrogen atoms. The use of oxygenated, chemicals that include oxygen atoms, compounds such as alcohols or ethers, is not permitted. Only a few select additives are permitted and their use is strictly controlled and limited. The primary ingredient in avgas is isooctane. This is a special component produced in the refining process by specialized equipment. StnaB amounts of isopentane and aromatic (ring) compounds are also used. The isopentane allows the correct volatility to be achieved in the final fuel blend Aromatics are used to improve the rich mixture ratings. However, these aromatics must be limited to achieve other specifications. Grade 80 avgas may also contain straight-run gasoline but this component's lower octane rating makes it unsuitable for higher octane blends. Approved additives include alkyl-lead anti-knock additives. Other additives are also used to then control lead deposit formation. Color dyes are required in most grades for safety identification. Another common, and required, additive includes oxidation inhibitors to improve storage stability and inhibit gum formation. Theses anti-oxidant additives also help prevent lead compound precipitation (separation). Other additives such as corrosion inhibitors, fuel system icing inhibitor and static dissipator additives may also be included by agreement with the user, by the military or by some foreign specifications. All other additives are forbidden.

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