Wood — Sampling methods and general requirements for physical and mechanical testing of small clear wood specimens
This document specifies methods for the extensive and limited sampling of wood, conditioning and preparation of test pieces. It also specifies the general requirements for physical and mechanical testing of small clear wood specimens. The sampling guidance provided in this document can be applied for timber taken from either trees, logs, or pieces of ungraded/graded/presorted sawn timber for non-structural applications, such as furniture, windows, doors, etc., only.
Bois — Méthodes d'échantillonnage et conditions générales pour les essais physiques et mécaniques de petites éprouvettes de bois net
Standards Content (Sample)
Wood — Sampling methods and
general requirements for physical and
mechanical testing of small clear wood
Bois — Méthodes d'échantillonnage et conditions générales pour les
essais physiques et mécaniques de petites éprouvettes de bois net
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1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General principles . 1
5 Sampling . 1
5.1 Selection of material. 1
5.2 Sampling of wood material. 1
5.2.1 General. 1
5.2.2 Logs . 2
5.2.3 Matching for test of dry material . 2
5.2.4 Sawn timber . 2
6 Conditioning of material . 2
6.1 Test pieces with a standardized moisture content (air-dry) . 2
6.2 Test pieces with moisture content of equal to or above fibre saturation point (green) . 2
7 Preparation of test pieces . 3
7.1 Form and dimensions . . 3
7.2 Direction of grain . 3
7.3 Permissible deviations . 4
7.4 Marking . 4
7.5 Sample size (number of test pieces) . 4
7.5.1 Random sampling . 4
7.5.2 Selective sampling . 4
7.5.3 Mechanical sampling . 5
7.5.4 Minimum number of test pieces . 5
7.6 Conditioning of test pieces . 6
7.6.1 Testing at equilibrium moisture content (air-dry condition) . 6
7.6.2 Testing pieces at or above fibre saturation point (green condition) . 6
7.6.3 Storage . 6
8 General requirements for physical and mechanical tests . 6
8.1 Temperature and humidity conditions in the laboratory . 6
8.2 Procedure . 6
9 Calculation and expression of results . 6
10 Test report . 7
Bibliography . 8
© ISO 2019 – All rights reserved iii
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This document was prepared by Technical Committee ISO/TC 218, Timber.
This third edition cancels and replaces the second edition (ISO 3129:2012), which has been technically
The main changes compared to the previous edition are as follows:
— Clause 2 and Bibliography were updated.
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iv © ISO 2019 – All rights reserved
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INTERNATIONAL STANDARD ISO 3129:2019(E)
Wood — Sampling methods and general requirements
for physical and mechanical testing of small clear wood
This document specifies methods for the extensive and limited sampling of wood, conditioning and
preparation of test pieces. It also specifies the general requirements for physical and mechanical testing
of small clear wood specimens. The sampling guidance provided in this document can be applied for
timber taken from either trees, logs, or pieces of ungraded/graded/presorted sawn timber for non-
structural applications, such as furniture, windows, doors, etc., only.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 24294, Timber — Round and sawn timber — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 24294 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 General principles
This document covers procedures of sampling for obtaining small clear specimens which, when tested
in accordance with methods specified under relevant International Standards, may provide information
on the influence on mechanical properties of such factors as moisture content, density, position in
cross-section, height in the tree and locality of growth.
5.1 Selection of material
The material intended for physical and mechanical tests shall be selected taking into account the
purpose of the test, as well as the requirements to ensure that the properties obtained from the test
pieces represent the sample population.
5.2 Sampling of wood material
The material selected shall be in the form of either logs or sawn timbers.
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Trees or logs shall be selected to represent the population. For each species to be tested, at least five
trees or logs representative of that species or species group shall be selected.
A heart plank shall be cut from a log of acce