Adhesives — Wood-to-wood adhesive bonds — Determination of shear strength by compressive loading

This document specifies a method for determining the shear strength of wood-to-wood adhesive bonds, with a standard specimen loaded in compression and under specified conditions of preparation, conditioning and testing. This method is intended for testing only those adhesives used in bonding wood to wood. This method is not intended for use in testing manufactured products.

Adhésifs — Joints collés de bois à bois — Détermination de la résistance au cisaillement par effort de compression

General Information

Status
Published
Publication Date
05-Aug-2018
Current Stage
9020 - International Standard under periodical review
Start Date
15-Jul-2023
Completion Date
15-Jul-2023
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ISO 6238:2018 - Adhesives -- Wood-to-wood adhesive bonds -- Determination of shear strength by compressive loading
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INTERNATIONAL ISO
STANDARD 6238
Third edition
2018-08
Adhesives — Wood-to-wood adhesive
bonds — Determination of shear
strength by compressive loading
Adhésifs — Joints collés de bois à bois — Détermination de la
résistance au cisaillement par effort de compression
Reference number
ISO 6238:2018(E)
©
ISO 2018

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ISO 6238:2018(E)

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© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2018 – All rights reserved

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ISO 6238:2018(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 1
5 Test specimens. 3
6 Preparation of test blocks . 4
7 Conditioning of test blocks . 5
8 Preparation of test joints . 5
9 Procedure. 6
10 Expression of results . 6
11 Test report . 7
Annex A (normative) Information required prior to testing . 8
Annex B (normative) Timber species, surfaces, quality and moisture content.9
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ISO 6238:2018(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.
The procedures used to develop this document and those intended for its further maintenance are
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
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
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For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
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 6238:2001), of which it constitutes a
minor revision.
The changes compared to the previous edition are as follows:
— the references in Clause 2 have been updated;
— Clause 3 has been inserted and subsequent clauses have been renumbered;
— the document has been editorially revised.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
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INTERNATIONAL STANDARD ISO 6238:2018(E)
Adhesives — Wood-to-wood adhesive bonds —
Determination of shear strength by compressive 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 compression and under specified conditions of preparation,
conditioning and testing. This method is intended for testing only those adhesives used in bonding
wood to wood.
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 291,Plastics — Standard atmospheres for conditioning and testing
ISO 7500, Metallic materials — Verification of static uniaxial testing machines — Part 1: Tension/
compression testing machines — Verification and calibration of the force-measuring system
3 Terms and definitions
No terms and definitions are listed in this document.
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 Apparatus
4.1 Apparatus for preparation of adhesive
4.1.1 Balance and other suitable 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 spread.
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 compression.
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ISO 6238:2018(E)

4.2 Apparatus for the determination
4.2.1 Analytical balance, capable of weighing to 0,000 1 g.
4.2.2 Linear measuring device, reading to 0,05 mm, e.g. vernier calipers or micrometer.
4.2.3 Tensile-testing machine, operating in the compression mode, capable of maintaining a pre-
determined constant cross-head rate. The machine shall be capable of determining a maximum load.
The measured strength shall be between 15 % and 85 % of the capacity of the machine. The machine
shall permit the measurement and recording of the applied force with an accuracy of ±1 %. The testing
machine shall be fitted with a shearing tool containing a self-alignment seat to ensure uniform lateral
distribution of the force.
NOTE A shearing tool as shown in Figure 1 has been found satisfactory.
The equipment shall be calibrated regularly in accordance with ISO 7500-1.
It is recommended that the machine be autographic, giving a chart that can be read in terms of
millimetres of cross-head movement as one coordinate and applied force as the other coordinate. It is
also recommended that inertialess equipment be used.
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ISO 6238:2018(E)

Dimensions in millimetres
Key
1 test specimen
2 oil hole
Figure 1 — Example of shearing tool for compressive shear testing of specimen A
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 Individual test joints shall comply with the form and dimensions shown in Figure 2. The individual
test joints shall be cut from bonded blocks prepared as described in Clauses 6 and 7.
L and W represent the length and the width of the bonded area. The user shall select either the
geometry of specimen A (bonded area 40 mm × 50 mm) or the geometry of specimen B (bonded area
25 mm × 25 mm). T represents the thickness, which is 20 mm for specimen A and 10 mm for specimen B.
In cases of dispute, only specimen A shall be used.
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ISO 6238:2018(E)

5.3 For adhesive quality control purposes, test a minimum of three test joints from each of three
different bonded blocks, prepared as described in Clauses 6 and 7.
5.4 Where greater precision is required, test a minimum of five test joints from each of four different
bonded blocks.
Dimensions in millimetres

a
Direction of grain.
b
L and W = 40 mm × 50 mm for specimen A or 25 mm × 25 mm for specimen B.
c
T = 20 mm for specimen A or 10 mm for specimen B.
Figure 2 — Shape and dimensions of test specimen
6 Preparation of test blocks
6.1 Blocks shall be cut from the timber, preferably of a size such that five test joints may be cut from
one bonded block as shown in Figure 3. The grain direction shall be parallel to the longest dimension of
the block. The bloc
...

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