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 2024
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Published in Switzerland
ii
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

iii
Foreword
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This document was prepared by European Committee for Standardization as EN 14257:2019, and drafted in
accordance with its editorial rules. It was assigned to Technical Committee ISO/TC 61, Plastics, subcommit
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