ISO 17225-5:2026

Solid biofuels — Fuel specifications and classes — Part 5: Graded firewood

This document specifies the fuel quality classes and specifications of graded firewood. This document applies only to firewood produced from the following raw materials (see ISO 17225-1:2021, Table 1):

• 1.1.1 Whole trees without roots;
• 1.1.3 Stemwood;
• 1.1.4 Logging residues (thick branches, tops, etc.);
• 1.2.1 Chemically untreated by-products

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