The specifications are:

Sulphur:5,5% (as delivered) maximum;
Hgi:55 minimum (typical 70+);
Moisture:8-10% typical;
Volatile matter:9-13% typical;
Ash:1.0% (dry basis) maximum;
Calorific value:13,800 - 14,200 btu/lb gross;
Size: Run of coker.