ISO 12580:2007

INTERNATIONAL ISO
STANDARD 12580
First edition
2007-10-01
Timber structures — Glued laminated
timber — Methods of test for glue-line
delamination
Structures en bois — Bois lamellé-collé — Méthodes d'essai de
décollement des plans de collage

Reference number
©
ISO 2007
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ii © ISO 2007 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Terms and definitions. 1
3 Symbols and abbreviated terms . 1
4 Principle. 1
5 Apparatus . 2
5.1 Pressure vessel for methods A, B, C. 2
5.2 Boiling and cooling vessels for method D. 2
5.3 Drying duct for methods A, B, C, D, E . 2
6 Preparation of test pieces. 2
7 Procedure . 3
7.1 General. 3
7.2 Test cycle for method A. 4
7.3 Test cycle for method B . 4
7.4 Test cycle for method C . 4
7.5 Test cycle for method D . 5
7.6 Test cycle for method E . 5
8 Results . 5
8.1 General. 5
8.2 Total delamination . 6
8.3 Maximum delamination . 6
9 Test report . 6
Bibliography . 7

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
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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 12580 was prepared by Technical Committee ISO/TC 165, Timber structures.
iv © ISO 2007 – All rights reserved

Introduction
This International Standard was developed by TC 165 as a factory quality-assurance test to be used for
structural glulam. It is intended that it be used in conjunction with ISO 12578 and be applied to each
production batch. The frequency of testing and the pass/fail criteria are detailed in ISO 12578. However, there
is nothing in principle that would prevent the test method from being applied to non-structural glulam.

INTERNATIONAL STANDARD ISO 12580:2007(E)

Timber structures — Glued laminated timber — Methods of test
for glue-line delamination
1 Scope
This International Standard specifies five delamination methods for factory quality assurance of the glue line of
glued laminated timber.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
delamination length
sum of the lengths of open glue lines on both end-grain surfaces of each test piece
2.2
glued laminated timber (glulam)
structural member formed by bonding together timber laminations with their grain essentially parallel
2.3
gauge pressure
NOTE Atmospheric pressure at sea level approximates 100 kPa.
3 Symbols and abbreviated terms
b: width of cross-section, in millimetres;
h: depth of cross-section, in millimetres;
l : maximum delamination length of one glue line in the test piece, measured on both end grain
max, delam
surfaces of the test specimen, in millimetres, see Figure 1;
l : length of one glue line, normally the width b, in millimetres, see Figure 1;
glue line
l : delamination length of all glue lines on the two end-grain surfaces in the test piece, in millimetres;
tot, delam
l : entire length of glue lines on the two end-grain surfaces of each test piece, in millimetres.
tot, glue line
4 Principle
A gradient is introduced in the moisture content of the wood to build up internal stresses. This results in tensile
stresses perpendicular to the glue lines, so that an inadequate bonding quality will result in delamination of the
glue lines.
5 Apparatus
5.1 Pressure vessel for methods A, B, C
A pressure vessel designed to safely withstand a gauge pressure of at least 600 kPa and a gauge vacuum of
at least 85 kPa, and equipped with pumps or similar devices capable of giving the required pressure and
vacuum are required.
5.2 Boiling and cooling vessels for method D
Boiling and cooling vessels, of sufficient size to hold the specimens so that they are completely submerged,
are required.
5.3 Drying duct for methods A, B, C, D, E
A drying du
...