ASTM D975 covers multiple grades of diesel fuel, each with slightly different specifications for the fuel's chemical and physical composition. For example, diesel fuel #2 has a minimum flash point of 125.6°F, while diesel fuel #1 has a minimum flash point of 100°F (For winter temps)
Here are some of the grades of diesel fuel covered by ASTM D975:
Grade Low Sulfur No. 2-D: A general-purpose fuel for automotive and non-automotive diesel engines
No. 1-D S15: An ultra-low sulfur (ULSD) light middle distillate fuel for diesel engines that require higher volatility
No. 1-D S500: A low sulfur light middle distillate fuel for diesel engines that require higher volatility
No. 1-D S5000: A regular sulfur light middle distillate fuel for diesel engines that require higher volatility
Grade 4-DA: A heavy distillate fuel for use in low- and medium-speed diesel engines
ASTM D975 does not prevent the use of more restrictive federal, state, or local regulations.
