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View Hess Brand Gasoline MSDS at their website:  (PDF file format, Hess revised on 9/25/07.).
http://www.hess.com/ehs/msds/9950AllGradesGasoline.pdf

A link to the MSDS for Hess brand gasoline is included here, as just one example of ingredients gasoline may contain.

Note: All MSDS (Material Safety Data Sheets) are available to the public for all brands and types of gasoline.
ASTM standards (publication) can also assist you to learn about fuel specifications and gasoline requirements.


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Hess MSDS No. 9950 (Gasoline All Grades) includes the following ingredients:

Gasoline (86290-81-5) 100 %
Benzene (71-43-2) 0.1 - 4.9 (0.1 - 1.3 reformulated gasoline)
n-Butane (106-97-8) < 10 %
Ethyl Alcohol (Ethanol) (64-17-5) 0 - 10 %
Ethyl benzene (100-41-4) < 3 %
n-Hexane (110-54-3) 0.5 to 4 %
* Methyl-tertiary butyl ether (MTBE) (1634-04-4) 0 to 15.0 %
Tertiary-amyl methyl ether (TAME) (994-05-8) 0 to 17.2 %
Toluene (108-88-3) 1 - 25 %
1,2,4- Trimethylbenzene (95-63-6) < 6 %
Xylene, mixed isomers (1330-20-7) 1 - 15 %
A complex blend of petroleum-derived normal and branched-chain alkane, cycloalkane, alkene, and
aromatic hydrocarbons. May contain antioxidant and multifunctional additives. Non-oxygenated
Conventional Gasoline and RBOB do not have oxygenates (Ethanol or MTBE and/or TAME).
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Hint:  Always also review section of gasoline MSDS pertaining to "solubility in water". 
Hess MSDS 9950 states:

SOLUBILITY (H2O):
Non-oxygenated gasoline - negligible.
Gasoline with  ethanol is readily soluble in water.

Hess published above ingredients in MSDS dated 09/25/07.
Note: Since MTBE is now banned from use in gasoline, I expect they have an updated MSDS reflecting this change...I will update when available.




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For more information on what gasoline may contain see page titled "What is Gasoline" at http://www.fuel-testers.com/what_is_gasoline_e10.html

ALL GASOLINE CONTAINS: Refined petroleum.  Saturated hydrocarbons (aka paraffins, alkanes) are the major component of gasoline.

GASOLINE USUALLY WILL ALSO CONTAIN: olefins or alkenes,  (E.G. 1-pentene, 2-methyl-2-butene),  cycloalkanes or naphthenes: (E.G. cyclopentane, cyclohexane),  oxygenators (E.G. ethanol, ETBE),  octane enhancers,  aromatics,  blending agents,
preservatives,  fuel conditioners and stabilizers,  detergents, dyes and more...

Note: All brands and grades of gasoline vary widely, and ingredients such as ethanol are added locally, not at the fuel company refinery.



To review different brands of gasoline ingredients, review company's published MSDS of product.
Search online or contact fuel company directly to obtain MSDS and information. 

For assistance contact Fuel-Testers, supplier of ethanol alcohol fuel test kits.



Example of Ingredients in Gasoline:
Hess brand - MSDS 9950 - All Grades of Gasoline

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