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This International Standard determines the fuel quality classes and specifications of graded wood pellets for non-industrial and industrial use. This International Standard covers only wood pellets produced from the following raw materials (see ISO 17225-1, Table 1): - 1.1 Forest, plantation and other virgin wood - 1.2 By-products and residues from wood processing industry - 1.3 Used wood NOTE 1 For the avoidance of doubt, demolition wood is not included in the scope of this International Standard. Demolition wood is "used wood arising from demolition of buildings or civil engineering installations". NOTE 2 Thermally treated pellets (e.g. torrefied pellets) are not included in the scope of this International Standard. Torrefaction is a mild pre-treatment of biomass at a temperature between 200 - 300 C.