... rice husk, coffee husk, coir pith, jute sticks, groundnut shells, Bamboo, wood, straw dust, Mustard stalk and cotton stalks ,nutshell, coconut shell ... . The natural lignin content in biomass is liberated with wood fiber under high pressure and temperature.In the briquetting process ... lignin serves as the glue and combines the particles of wood together,thus binding, compressing the biomass to form into ...