prEN ISO 7389

• Abstract:

  This International Standard specifies a method for the determination of the elastic recovery of sealants after maintained extension.

• Status: Not Published
• Publication Date: 15-Nov-2027
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: CEN/SS B02 - Structures
• Drafting Committee: CEN/SS B02 - Structures
• Current Stage: 4060 - Closure of enquiry - Enquiry
• Start Date: 13-Jul-2026
• Completion Date: 13-Jul-2026
• Ref Project: oSIST prEN ISO 7389:2026 - Building and civil engineering sealants - Determination of elastic recovery of sealants (ISO/DIS 7389:2026)

• Revises: EN ISO 7389:2003 - Building construction - Jointing products - Determination of elastic recovery of sealants (ISO 7389:2002)
• Effective Date: 17-Sep-2025

Overview

prEN ISO 7389:2026 specifies a standardized method for determining the elastic recovery of building and civil engineering sealants after maintained extension. Developed by CEN and aligned with ISO/DIS 7389:2026, this international standard supports the evaluation of sealants’ performance in buildings and civil engineering works by measuring their ability to return to their original form after being stretched for a specified duration.

The method outlined in prEN ISO 7389 is applicable to a wide range of sealant products and is crucial for assessing material behavior under movement, which is vital for the longevity and reliability of construction joints exposed to mechanical stress and environmental conditions.

Key Topics

• Elastic recovery measurement: Involves extending a cured sealant bead between defined substrates, maintaining the extension, then calculating the percentage return to the initial width after release.
• Test substrates: Specifies use of mortar, anodized aluminium, or glass substrates, with dimensions and preparation outlined to ensure consistency.
• Conditioning methods: Describes two conditioning protocols:
  • Method A: 28 days at controlled temperature and humidity.
  • Method B: Includes cycles of heat and water immersion to assess sealant performance under more demanding conditions.
• Test apparatus: Details required equipment, including extension machines, spacers, separators, and calipers for precise measurement.
• Result expression: Provides guidance for calculating and reporting the mean elastic recovery value across multiple specimens.

Applications

The procedure set forth in prEN ISO 7389 is essential for:

• Sealant manufacturers: To evaluate and document product performance for building and civil engineering sealants, ensuring they meet market and regulatory needs.
• Quality control and compliance: Laboratories and technical assessors use this method to verify sealant compliance with product specifications and contractual requirements.
• Building designers and engineers: To select sealant materials with proven elastic recovery, thereby enhancing joint durability in facades, flooring, glazing, and expansion joints.
• Standardized testing in R&D: Facilitates comparative testing during product development or formulation changes, supporting innovation and reliable market introduction of new sealing products.

The method is relevant for both one-part and multi-component sealants, regardless of their specific chemical families, making it a key reference in construction project specifications and product certifications.

Related Standards

For comprehensive assessment and specification of sealants in construction, the following standards are closely related to prEN ISO 7389:

• ISO 6927: Building and civil engineering sealants - Vocabulary
• ISO 13640: Building and civil engineering sealants - Specifications for test substrates

These standards support clarity in terminology and ensure consistency in substrate properties for accurate and reproducible test results. Additional national and international standards addressing sealant durability, adhesion, and weathering properties may also be consulted depending on project requirements.

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By adhering to prEN ISO 7389, organizations ensure standardized, reliable assessment of sealant elastic recovery, promoting high-performance materials and durable construction solutions across the industry.

SLOVENSKI STANDARD
01-junij-2026
Tesnilne mase za stavbe in gradbene inženirske objekte - Ugotavljanje
sposobnosti povrnitve za tesnilne mase (ISO/DIS 7389:2026)
Building and civil engineering sealants - Determination of elastic recovery of sealants
(ISO/DIS 7389:2026)
Dichtstoffe im Hoch- und Tiefbau - Bestimmung des Rückstellvermögens (ISO/DIS
7389:2026)
Mastics pour le bâtiment et le génie civil - Détermination de la reprise élastique des
mastics (ISO/DIS 7389:2026)
Ta slovenski standard je istoveten z: prEN ISO 7389
ICS:
91.100.50 Veziva. Tesnilni materiali Binders. Sealing materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 7389
ISO/TC 59/SC 8
Building and civil engineering
Secretariat: SAC
sealants — Determination of elastic
Voting begins on:
recovery of sealants
2026-04-20
ICS: 91.100.50
Voting terminates on:
2026-07-13
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 7389:2026(en)
DRAFT
ISO/DIS 7389:2026(en)
International
Standard
ISO/DIS 7389
ISO/TC 59/SC 8
Building and civil engineering
Secretariat: SAC
sealants — Determination of elastic
Voting begins on:
recovery of sealants
ICS: 91.100.50
Voting terminates on:
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: [phone]
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 7389:2026(en)
ii
ISO/DIS 7389:2026(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Preparation of test specimens . 4
7 Conditioning of test specimens . 4
7.1 General .4
7.2 Conditioning method A .4
7.3 Conditioning method B .4
8 Procedure . 4
9 Expression of results . 5
10 Test report . 5

iii
ISO/DIS 7389:2026(en)
Foreword
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