ISO 6237:2017

SLOVENSKI STANDARD
SIST ISO 6237:2020
01-september-2020
Lepila - Lepila za les - Ugotavljanje strižne trdnosti z natezno obremenitvijo
Adhesives - Wood-to-wood adhesive bonds - Determination of shear strength by tensile
loading
Adhésifs - Joints collés de bois à bois - Détermination de la résistance au cisaillement
par effort de traction
Ta slovenski standard je istoveten z: ISO 6237:2017
ICS:
83.180 Lepila Adhesives
SIST ISO 6237:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 6237:2020

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SIST ISO 6237:2020
INTERNATIONAL ISO
STANDARD 6237
Third edition
2017-11
Adhesives — Wood-to-wood adhesive
bonds — Determination of shear
strength by tensile loading
Adhésifs — Joints collés de bois à bois — Détermination de la
résistance au cisaillement par effort de traction
Reference number
ISO 6237:2017(E)
©
ISO 2017

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SIST ISO 6237:2020
ISO 6237:2017(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland
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SIST ISO 6237:2020
ISO 6237:2017(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 1
4.1 Apparatus for preparation of adhesive . 1
4.2 Test apparatus . 1
5 Test specimens. 2
6 Preparation of test panels . 4
7 Conditioning of test panels . 4
8 Preparation of specimens . 4
9 Procedure. 4
10 Expression of results . 5
11 Test report . 5
Annex A (normative) Information required prior to testing . 7
Annex B (normative) Timber species, thickness, surfaces, quality and moisture content .8
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SIST ISO 6237:2020
ISO 6237:2017(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
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electrotechnical standardization.
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described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
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URL: www.iso.org/iso/foreword.html
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 11,
Products.
This third edition cancels and replaces the second edition (ISO 6237:2003), which has been technically
revised.
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SIST ISO 6237:2020
INTERNATIONAL STANDARD ISO 6237:2017(E)
Adhesives — Wood-to-wood adhesive bonds —
Determination of shear strength by tensile loading
1 Scope
This document specifies a method for determining the shear strength of wood-to-wood adhesive bonds,
with a standard specimen loaded in tension and under specified conditions of preparation, conditioning
and testing. This method is intended for testing only those adhesives used in bonding wood to wood in
either parallel-laminated or cross-laminated construction.
This method is not intended for use in testing manufactured products.
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 472, Plastics — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Apparatus
4.1 Apparatus for preparation of adhesive
4.1.1 Balance and equipment capable of measuring the proportions of the adhesive mix to within a
tolerance of ±1 %.
4.1.2 Mixing equipment to ensure homogeneous mixing of the constituents with minimum aeration
of the adhesive (except foamed adhesive).
4.1.3 Spreading equipment such as a wire-wound bar, roller spreader, curtain coater or suitable
hand applicators, capable of spreading the adhesive uniformly within ±5 % of the desired thickness.
4.1.4 Equipment, designed to exert the required pressure evenly over the whole bonded area
within ± 5 % of the desired value, for example a press or clamps. If necessary, heated platens capable of
maintaining the prescribed temperature within ±2 °C during pressing.
4.2 Test apparatus
4.2.1 Analytical balance.
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4.2.2 Linear measuring device, to read to 0,05 mm, e.g. vernier calipers or micrometer.
4.2.3 Test machine, capable of exerting a tensile force of at least 5 kN with an accuracy of ±2 %. The
force shall be applied at a uniformly increasing rate in the range 2,5 kN/min to 6 kN/min or at a uniform
crosshead speed between 0,5 mm/min and 1,0 mm/min unless otherwise agreed between the interested
parties.
The test machine shall be equipped with suitable grips and jaws so that the specimen is held tightly
without slipping during testing and is held in alignment so that the stress is applied as required in
Clause 9.
It is necessary for all equipment, including gauges, thermometers, etc., to be calibrated regularly, as
prescribed by the test authority of each country.
5 Test specimens
5.1 The timber species, timber quality and timber moisture content for the specimens shall be as
described in Annex B.
5.2 The test specimen shall be of a two-ply or three-ply construction and shall conform to the form
and dimensions shown in Figures 1 and 2. The test specimens shall be cut from test panels prepared as
described in this clause and Clause 6.
Dimensions in millimetres
a) Two-ply tensile shear specimen b) Three-ply tensile shear specimen
Key
a
Cut up to but not beyond glue line.
b
Width of sawcut.
c
Direction of grain of both veneers.
d
Glue lines.
e
Direction of grain of face veneers (direction of grain of central veneer shall be at right angles to grain of two
face veneers).
Figure 1 — Test specimens
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Dimensions in millimetres
Key
a
Width of sawcut.
b
Direction of grain.
Figure 2 — Suggested arrangement of specimens
5.2.1 For the specimen of two-ply construction, the grain of both plies shall be parallel to the long
dimension of the specimen.
5.2.2 For the specimen of three-ply or cross-laminated construction, the grain of the face plies shall be
parallel to the long dimension of the specimen and the grain of the centre ply shall be parallel to the short
dimension of the specimen and at right angles to the grain of the two outer plies.
NOTE Both types are suitable for general testing of close contact adhesives but values obtained with the two
different specimens are not comparable. Two-ply specimens are often used for applications where the grain of
the adherends is parallel while the three-ply specimens may be preferred for adhesives predominantly used in
the production of wooden panels such as plywood or particle board.
5.2.3 For adhesive quality control purposes, test a minimum of four specimens from each of three
panels of similar construction.
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