 The most mature of these is torrefaction, basically an advanced roasting technique which—when combined with pelleting or briquetting—significantly influences handling and transport properties, grindability and combustion efficiency.Miscanthus chips have a bulk density of only 50–130 kg/m3, bales 120–160 kg/m3, while pellets and briquettes have a bulk density of 500 and 600 kg/m3 respectively.Torrefaction works hand in hand with this trend towards a denser and therefore cheaper to transport product, specifically by increasing the product’s "energy" density.