Full Description

ISO 17225-4:2021 determines the fuel quality classes and specifications of graded wood chips. This document covers only wood chips produced from the following raw materials (see ISO 17225-1:2021, Table 1):

1.1 Forest, plantation and other virgin wood;

1.2 By-products and residues from wood processing industry;

1.3.1 Chemically untreated used wood.

This document covers only wood chips, which are produced with sharp tools, and does not cover hog fuel, which is produced with blunt tools.