ASTM D5797 Standard Specification for Fuel Methanol (M70-M85)
ASTM D5797 Standard Specification for Fuel Methanol (M70-M85) for Automotive Spark-Ignition Engines
6. Test Methods
6.1 Determine the requirements enumerated in this specification in accordance with the following test methods:
NOTE 2 - The appropriateness of ASTM test methods cited has not been demonstrated for use with M70-M85. In addition, test methods contained in the annexes and appendixes are in the developmental stages or lack precision and bias determinations.
6.1.1 Methanol - A procedure for a test method for methanol content of fuel methanol (M70-M85) is included as Annex A1. Verification of the appropriateness of this test method has indicated that the precision of this method may not be adequate. As work continues to develop a method, this procedure remains the best available.
6.1.2 Hydrocarbon/Aliphatic Ether - Use Test Method D4815 to determine higher alcohols, methyl tert-butyl ether (MTBE), and other ethers. Water may also be determined if the gas chromatograph is equipped with a thermal conductivity detector. As an alternative, water can be determined by the Karl Fischer test method (see 6.1.9). The concentration of methanol, other alcohols, and water can be added, and the sum subtracted from 100 to get the percent of hydrocarbons/aliphatic ethers. An alternative test method is contained in Annex A2.
6.1.3 Vapor Pressure - Test Methods D4953, D5190, or
6.1.4 Acidity - Test Method D1613.
6.1.5 Gum Content, Solvent Washed and Unwashed - Test Method D381.
6.1.6 Total Chlorine as Chloride - Test Methods D4929, Method B.
6.1.7 Lead - Test Method D5059. With Test Method D5059, prepare the calibration standards using methanol (reagent grade) as the solvent to prevent errors caused by large differences in carbon-hydrogen ratios.
6.1.8 Phosphorus - Test Method D3231.
6.1.9 Water - Test Method E 203.
6.1.10 Sulfur - Test Methods D1266, D2622, D3120, or D5453. With Test Method D2622, prepare the calibration standards using methanol (reagent grade) as the solvent to prevent errors caused by large differences in carbon-hydrogen ratios.
6.1.11 Inorganic Chloride - Inorganic chloride can be determined by Test Methods D512-81(1985)e1 (Method C). Also, see the test method in Annex A3. Another test method is under development.
7. Keywords
7.1 acidity; alcohol; automotive spark-ignition engine fuel; chloride; copper corrosion; ether; fuel methanol (M70-M85) for automotive spark-ignition engines; gum content; hydrocarbon; inorganic chloride; lead; MTBE; M70-M85; methanol; oxidation stability; oxygenates; phosphorus; solvent washed; sulfur; total chlorine; vapor pressure; volatility; water
