... sizes:6-12mm5.Certificate:ISO9001:20001.OKK Wood Pellets Introduction: Biomass granule fuel from OKK,main structure is pure ... sawdust only processed by professional mechanical treatment,compresion molding to change its density,hardness and combustibility,made the production ... out. The moisture content of pellets smaller, more conducive to storage.3 Grain hardness, surface finish, internal curing fully, ...