Vietnam rice husk briquette Origin: vietnam Packing: pp bag, carton or as buyer's requirements Rice husk 100% natural Used forenergy, heating system. Shape:tube with hole in center Length:20 - 50 cm Color:black outside, inside natural rice husk Sulfur:0.012% max Moisture:12% max Ash content:13- 17% Calorific value:3800 - 4200 kcal / kg Density:1170 kg / m3