manufacturer of hardwood charcoal and briquettes all our charcoal is made from natural mangrove wood specification1) burning time 5-9 hours2) moisture 6-8%3) fixed carbon 85%4) calorific value 6500-7000 kca/kg5) ash content 1.5-2%6) volatile matter 12.5-30%7) sizes 20-100 mm 30-200 mm8) shape lump9) foreign matter 1%10) made with physical method 100% pure wood 11) no chemical content12) ph value 7-9