ISO 34257:2024

Adhesives — Wood adhesives — Determination of tensile strength of lap joints at elevated temperature (WATT '91)

This document specifies a method for testing the strength of wood adhesives at 80 °C. NOTE The procedure described is based on a test developed in Germany known originally as the WATT '91 test. It uses the test piece described in ISO 19210.

Adhésifs — Adhésifs pour bois — Détermination de la résistance en traction à température élevée des joints à recouvrement (essai WATT '91)

Le présent document spécifie une méthode d’essai de la résistance à 80 °C des adhésifs pour bois. NOTE La méthode décrite reprend un essai mis au point en Allemagne, initialement connu sous le nom d’essai WATT ’91. Elle utilise l’éprouvette correspondant à la description de l’ISO 19210.

General Information

• Status: Published
• Publication Date: 29-Feb-2024
• ICS: 83.180 - Adhesives
• Technical Committee: ISO/TC 61/SC 11 - Products
• Drafting Committee: ISO/TC 61/SC 11 - Products
• Current Stage: 6060 - International Standard published
• Start Date: 01-Mar-2024
• Due Date: 08-Apr-2024
• Completion Date: 01-Mar-2024

Relations

• Parent: ISO/IEC 11801-2:2017 - Information technology — Generic cabling for customer premises — Part 2: Office premises
• Effective Date: 06-Jun-2022

Standards Content (Sample)

International
Standard
ISO 34257
First edition
Adhesives — Wood adhesives —
2024-03
Determination of tensile strength of
lap joints at elevated temperature
(WATT '91)
Adhésifs — Adhésifs pour bois — Détermination de la résistance
en traction à température élevée des joints à recouvrement (essai
WATT '91)
Reference number
ISO 34257:2024(en) © ISO 2024

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ISO 34257:2024(en)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland

© ISO 2024 – All rights reserved
ii

---------------------- Page: 2 ----------------------
ISO 34257:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Sample preparation . 2
6.1 Preparation of the-test pieces .2
6.2 Conditioning of the bonded assemblies .2
7 Test procedure . 2
8 Calculation and expression of the results . 2
9 Test report . 3
9.1 General .3
9.2 The adhesive .3
9.3 Preparation of the test pieces and testing procedures .3
9.4 Test results .3

© ISO 2024 – All rights reserved
iii

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ISO 34257:2024(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies).
...

International
Standard
ISO 34257
First edition
Adhesives — Wood adhesives —
Determination of tensile strength of
lap joints at elevated temperature
(WATT '91)
Adhésifs — Adhésifs pour bois — Détermination de la résistance
en traction à température élevée des joints à recouvrement (essai
WATT '91)
PROOF/ÉPREUVE
Reference number
ISO 34257:2024(en) © ISO 2024

---------------------- Page: 1 ----------------------
ISO 34257:2024(en)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
PROOF/ÉPREUVE
© ISO 2024 – All rights reserved
ii

---------------------- Page: 2 ----------------------
ISO 34257:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Sample preparation . 2
6.1 Preparation of the-test pieces .2
6.2 Conditioning of the bonded assemblies .2
7 Test procedure . 2
8 Calculation and expression of the results . 2
9 Test report . 3
9.1 General .3
9.2 The adhesive .3
9.3 Preparation of the test pieces and testing procedures .3
9.4 Test results .3
PROOF/ÉPREUVE
© ISO 2024 – All rights reserved
iii

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ISO 34257:2024(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standard
...

CEN/TC 193
Style Definition
...
Date: 2019-05
EN 14257:2019
CEN/TC 193
ISO/PRF 34257
ISO/TC 61/SC 11
Secretariat:  UNEJISC Formatted: English (United Kingdom)
Formatted: English (United Kingdom)
Date: 2024-01-05
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
Formatted: Cover Title_A1, Adjust space between Latin
Adhesives — Wood adhesives — Determination of tensile
and Asian text, Adjust space between Asian text and
strength of lap joints at elevated temperature (WATT'91WATT numbers
'91)
Adhésifs — Adhésifs pour bois — Détermination de la résistance en traction à température élevée des
Formatted
...
joints à recouvrement (essai WATT'91WATT '91)
ICS:
Descriptors:
PROOF

---------------------- Page: 1 ----------------------
EN 14257:2019 (E)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this
publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical,
including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can
be requested from either ISO at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
E-mail: [e-mail]
Website: www.iso.org
Published in Switzerland
2

---------------------- Page: 2 ----------------------
EN 14257:2019 (E)
Contents Page
Foreword . 4
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
6 Sample preparation . 2
6.1 Preparation of the-test pieces . 2
6.2 Conditioning of the bonded assemblies . 2
7 Test procedure . 2
8 Calculation and expression of the results . 2
9 Test report . 3
9.1 General . 3
9.2 The adhesive . 3
9.3 Preparation of the test pieces and testing procedures . 3
9.4 Test results . 3

Foreword 3
1 Scope 4
2 Normative references 4
3 Terms and definitions 4
4 Principle 4
5 Apparatus 4
6 Sample preparation 4
6.1 Preparation of the-test pieces 4
6.2 Conditioning of the bonded assemblies 5
7 Test procedure 5
8 Calculation and express of results 5
9 Test report 5
9.1 General 5
9.2 The adhesive 6
9.3 Preparation of the test pieces and testing procedures 6
9.4 Test results 6

3

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EN 14257:2019 (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 comm
...