Thermal coal Indicator Value Fraction, mm 0-300 Ash content, dry state (Ad), % max 17% Total moisture, in good condition (Wtr) % max 14% Total sulfur content, dry state (Sd), % no more than 0.5% Yield of volatile patients, dry ash-free state (Vdaf), % no more than 45% Lower calorific value, in good condition (Qir), kcal/kg 5800
