ISO 27769-2:2009

INTERNATIONAL ISO
STANDARD 27769-2
First edition
2009-08-01


Wood-based panels — Wet-process
fibreboard —
Part 2:
Requirements
Panneaux à base de bois — Panneau de fibres obtenu par procédé
humide —
Partie 2: Spécifications





Reference number
ISO 27769-2:2009(E)
©
ISO 2009

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ISO 27769-2:2009(E)
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ii © ISO 2009 – All rights reserved

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ISO 27769-2:2009(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Expression of specification limits and general requirements . 2
4.1 Expression of specification limits. 2
4.2 Lower specification limits. 2
4.3 Upper specification limits . 2
4.4 Density variation, dimension and moisture content requirements . 3
5 Requirements for softboards . 3
5.1 Requirements for general purpose softboard for use in dry conditions. 3
5.2 Requirements for general purpose softboard for use in humid conditions. 4
5.3 Requirements for general purpose softboard for use in high-humidity conditions. 4
5.4 Requirements for general purpose softboard for use in exterior conditions . 4
5.5 Requirements for load-bearing softboard for use in dry conditions . 5
5.6 Requirements for load-bearing softboard for use in humid conditions . 5
6 Requirements for hardboards . 5
6.1 Requirements for general purpose hardboard for use in dry conditions. 5
6.2 Requirements for general purpose hardboard for use in humid conditions . 6
6.3 Requirements for general purpose hardboard for use in high-humidity conditions . 6
6.4 Requirements for general purpose hardboard for use in exterior conditions . 7
6.5 Requirements for load-bearing hardboard for use in dry conditions . 7
6.6 Requirements for load-bearing hardboard for use in humid conditions . 8
Annex A (normative) Calculation of 5-percentile and 95-percentile values. 9
Bibliography . 11

© ISO 2009 – All rights reserved iii

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ISO 27769-2:2009(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 27769-2 was prepared by Technical Committee ISO/TC 89, Wood-based panels, Subcommittee SC 1,
Fibre boards.
ISO 27769 consists of the following parts, under the general title Wood-based panels — Wet-process
fibreboard:
⎯ Part 1: Classifications
⎯ Part 2: Requirements

iv © ISO 2009 – All rights reserved

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INTERNATIONAL STANDARD ISO 27769-2:2009(E)

Wood-based panels — Wet-process fibreboard —
Part 2:
Requirements
1 Scope
This part of ISO 27769 specifies the manufacturing property requirements for wet-process fibreboard.
NOTE The values listed in this part of ISO 27769 relate to product properties used to classify fibreboards into one of
the different types. The values are not characteristic values to be used for design purposes. When fibreboard is classified
as load-bearing and nominated for structural applications, characteristic strength and stiffness values are established
based upon testing in accordance with ISO 16572 or equivalent ASTM or EN Standards. Alternatively, for specific load-
bearing applications (e.g. walls, roofs, floors and I-joist webs), the load-bearing fibreboard would meet the specific
performance requirements for that intended application.
2 Normative references
The following referenced documents are indispensable for the application 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 9426, Wood-based panels — Determination of dimensions of panels
ISO 9427, Wood-based panels — Determination of density
ISO 16978, Wood-based panels — Determination of modulus of elasticity in bending and of bending strength
ISO 16979, Wood-based panels — Determination of moisture content
ISO 16983, Wood-based panels — Determination of swelling in thickness after immersion in water
ISO 16984, Wood-based panels — Determination of tensile strength perpendicular to the plane of the panel
ISO 16998, Wood-based panels — Determination of moisture resistance — Boil test
ISO 17064, Wood-based panels — Fibreboard, particleboard and oriented strand board (OSB) — Vocabulary
ISO 20585, Wood-based panels — Determination of wet bending strength after immersion in water at 70 °C or
100 °C (boiling temperature)
1)
ISO 27769-1:— , Wood-based panels — Wet-process fibreboard — Part 1: Classifications

1) To be published.
© ISO 2009 – All rights reserved 1

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ISO 27769-2:2009(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 17064 and ISO 27769-1 apply.
4 Expression of specification limits and general requirements
4.1 Expression of specification limits
This part of ISO 27769 may be used to evaluate groups of panels or production batches. To evaluate a group
of panels in accordance with this part of ISO 27769 the following shall be required.
a) The mandatory tests of ISO 27769-1:—, Tables 3 and 4 shall be carried out on samples of the group. The
test specimens shall be conditioned as specified in each test method.
b) The results of the tests shall be evaluated against the appropriate specification limits given in Tables 1
to 13, according to the grade and thickness range of the panels. Table 1 applies to all classes and
thickness ranges of panels.
For density variation and dimensions (see Table 1), the specification limits are based on the mean values for
individual panels (calculated in accordance with Annex A) and are the maximum tolerances for density
variation and dimensions.
The specification limits given in Tables 2 to 13 are based on 5 (lower) or 95 (upper) percentile expressions,
according to 4.2 and 4.3.
NOTE This part of ISO 27769 cannot be used to properly evaluate single panels, but can be used as an
approximation. The upper or lower specification limits can be taken as maximum or minimum values.
4.2 Lower specification limits
The requirements in Tables 2 to 13 are the lower specification limits for the following properties:
a) bending strength/modulus of rupture (MOR);
b) modulus of elasticity (MOE);
c) internal bond;
d) internal bond after boil test;
e) wet bending strength (MOR) after immersion in water.
The 5-percentile values based on the mean values for individual panels and calculated in accordance with
Annex A shall be equal to or greater than the lower specification limits in Tables 2 to 13.
4.3 Upper specification limits
The requirements in Tables 2 to 13 are the upper specification limits for the following properties:
a) thickness swelling after 2 h ( softboards);
b) thickness swelling after 24 h (hardboards).
The 95-percentile values based on the mean values for individual panels and calculated in accordance with
Annex A shall be equal to or less th
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