... The source of material is wide,could be coconut shell, peanut shell, stalk shell,corncob,sawdust and so on, wood shavings, bamboo ... hulk is the best of all.advantage of machine-made charcoal :high density,low ash content, no smoke ,no ... inflammablequality index:charcoal content >85%calorific value >8000 calash content <5%volatilization <15%moisture<4% coconut shell of machine-made charcoal making line ...