Shape : Square, Circle
Size: diameter > 2cm
Length: 3 - 10 cm
Ash content: 4 - 4,5%
Moisture: 5% max
Volatile matter content: 15 - 20% max
Fixed carbon content: 60 - 70%
Calorific value: 6500 Kcal/kg
Burning time: around 3 - 5 hours
No smoke - no sparks - no odor during ignition