... : The source of material is wide,could be coconut shell, peanut shell, stalk shell,corncob,sawdust and so on, wood shavings ... , bamboo crumbs ,sawdust,and rice hulk is the best of all.advantage of machine-made charcoal :high density,low ... value >8000 calash content <5%volatilization <15%moisture<4% 2012 best seller machine-made charcoal machine