> Particle size: 6mm to 8mm for domestic and small scale systems, 10-12> mm for larger systems> Moisture content: less than 10%> Calorific value: less than 4.7kWh/kg> Ash content: less than 1% (low), less than 3% (standard) or less than> 6% (high); to be clearly labelled> Bulk density: less than 600 kg/m> Sulfur content: less than 300 ppm> Chlorine: less than: 800ppm> Only additives: lignin and trace amounts of vegetable oil as a die lubricant
