ISO 17225-5:2021 PDF

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

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Title (English):

ISO 17225-5:2021

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

Document status:: Withdrawn
Format:: Electronic (PDF)
Number of pages:: 12
Publication date:: July 5, 2021
Edition:: ISO IS 17225 edition 2 version 1
ICS:: 27.190

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Description (English):

This document determines the fuel quality classes and specifications of graded firewood. This document covers only firewood produced from the following raw materials (see ISO 17725‑1:2021, Table 1): — 1.1.1 Whole trees without roots; — 1.1.3 Stem wood; — 1.1.4 Logging residues (thick branches, tops etc.); — 1.2.1 Chemically untreated by-products and residues from wood processing industry.

Technical details

Technical committee: ISO/TC 238 - Solid biofuels
SKU: ISO 17225-5:2021

Abstract

Overview

ISO 17225-5:2021 - "Solid biofuels - Fuel specifications and classes - Part 5: Graded firewood" defines fuel quality classes, dimensional and moisture specifications, and labelling requirements for oven‑ready firewood. The standard applies to firewood from whole trees, stem wood, logging residues and chemically untreated wood industry by‑products. It supports safe, efficient use of graded firewood in residential, small commercial and public building appliances and facilitates clear seller–buyer communication and equipment compatibility.

Key topics and technical requirements

Fuel classes: Defines classes A1, A2 and B with different dimensional and moisture limits.
- Moisture content (as‑received, wet basis): A1: 10–20%, A2: 10–25%, B: 10–35% (see ISO 18134‑2 for measurement).
- A1/A2: suitable for stoves and fireplaces; B: intended for log‑wood boilers.
Dimensions: Specifies maximum diameters (D classes, e.g. D2, D5, D10…) and standard lengths (L20–L100 with tolerances). Recommended diameter for stoves is

Related standards

Mentioned in the description and other ISO standards

Overview

Key topics and technical requirements

Fuel classes: Defines classes A1, A2 and B with different dimensional and moisture limits.
- Moisture content (as‑received, wet basis): A1: 10–20%, A2: 10–25%, B: 10–35% (see ISO 18134‑2 for measurement).
- A1/A2: suitable for stoves and fireplaces; B: intended for log‑wood boilers.
Dimensions: Specifies maximum diameters (D classes, e.g. D2, D5, D10…) and standard lengths (L20–L100 with tolerances). Recommended diameter for stoves is

ISO 17225-5:2021 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

Related standards

Solid biofuels - Determination of moisture content - Part 2: Simplified method (ISO 18134-2:2024)

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