ASTM D5983 Methyl Tertiary-Butyl Ether (MTBE) for Downstream Blending for Use in Automotive Spark-Ignition Engine Fuel
7. Test Methods
7.1 The scope of some of the test methods specified below do not include MTBE. The precision of those test methods may differ from the reported precisions when testing MTBE.

7.2 Appearance - Test Method D4176, Procedure 1.

7.3 Sulfur - Test Method D4045 (see Note 2).

7.4 Solvent-Washed Gum Content - Test Method D381, air-jet apparatus.

7.5 MTBE, mass % - Test Method D5441.

7.6 Methanol, mass % - Test Method D5441.

7.7 API Gravity at 15.6°C (60°F) - Practice D1298.

7.8 Density at 15°C - Practice D1298 or Test Method D4052.

7.9 Copper Strip Corrosion - Test Method D130, 3 h at 50°C (122°F).

7.10 Water Content - Test Methods E 203 or E 1064.

7.11 Vapor Pressure - Test Method D4953.

7.12 Color, Saybolt - Test Method D156.

NOTE 2 - Test Method D4045 may require dilution of the sample with a sulfur-free diluent.

8. Keywords
8.1 automotive spark-ignition engine fuel; blending; corrosion; impurities; methanol; methyl tertiary-butyl ether; oxygenate; water content