... water boiler, indust Raw metrical: crop like saw dust, corn stalk, wheat stalk, cotton stalk, rice straw, rice husk, peanut shell, corncob, bark ... . High density, it is 10-15 times to raw stalk in weight, density: 0.8-1.4g/cm3. Durable to use, ... : (the market of straw charcoal)can replace firewood, raw coal, liquefied gas, widely used in family stove, warming stove, hot-water boiler ...