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17.10.2026

Gasoil and No. 2 diesel (ASTM D975)

No. 2 diesel is the middle-distillate fuel defined by the American standard ASTM D975, sold mainly as grade No. 2-D S15 (max 15 ppm sulfur) or No. 2-D S500 (max 500 ppm sulfur). In international trade higher-sulfur middle distillates are often offered simply as "gasoil" with a stated sulfur limit, for example gasoil 50 ppm or 500 ppm.

Key ASTM D975 limits, grade No. 2-D

ParameterS15S500
Flash pointmin 52 °Cmin 52 °C
Cetane numbermin 40min 40
Sulfurmax 15 ppmmax 0.05 % mass
Distillation T90282 to 338 °C282 to 338 °C
Viscosity at 40 °C1.9 to 4.1 mm²/s1.9 to 4.1 mm²/s
Ashmax 0.01 % massmax 0.01 % mass
Water and sedimentmax 0.05 % volmax 0.05 % vol
Ramsbottom carbon residue (10 % residue)max 0.35 % massmax 0.35 % mass
Copper strip corrosionmax No. 3max No. 3
Lubricity (HFRR at 60 °C)max 520 µmmax 520 µm

Limits from ASTM D975-24, Table 1. Later editions exist; confirm the edition named in your contract. Cloud point has no fixed limit and is agreed for the region and season. Sources: ASTM D975-24 (NCWM copy).

Gasoil vs EN590

EN590 sets a higher minimum cetane number (51) and a sulfur limit of 10 mg/kg, and is required for road use in Europe. No. 2 diesel S15 is the US road equivalent. Higher-sulfur gasoils are used in markets with less strict fuel rules, for power generation and for industrial use. Always state the exact standard, grade and sulfur limit in the offer. See the EN590 product page.

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