ISO 7389-2002 PDF

Full title and description

ISO 7389:2002 — Building construction — Jointing products — Determination of elastic recovery of sealants. This International Standard specifies a laboratory method to determine the elastic recovery of jointing products (sealants) after a period of maintained extension, providing an objective measure of how well a sealant returns toward its original dimension after deformation.

Abstract

ISO 7389:2002 defines specimen preparation, conditioning, test procedure, measurement and calculation required to evaluate the elastic recovery of sealants used in building joints. The test measures dimensional recovery after a defined elongation and conditioning regimen and gives a standardized result (percentage recovery) reported as the mean of replicate specimens.

General information

• Status: Published (International Standard; last confirmed in systematic review).
• Publication date: October 2002 (Edition 3, 2002).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 91.100.50 — Binders. Sealing materials.
• Edition / version: Edition 3 (2002).
• Number of pages: 5 (concise test-method standard).

Scope

Applies to jointing products (sealants) used in building construction. The standard specifies a controlled laboratory method for determining the elastic recovery of cured sealant specimens after they have been held at a specified extension for a defined time and then released. It is intended to be used as a performance test in product development, quality control and for classification of sealants in conjunction with related standards.

Key topics and requirements

• Test principle: elongate a cured sealant specimen to a specified extension, maintain the elongation for a defined period, release and measure dimensional recovery after a set recovery interval.
• Specimen preparation: use defined substrate arrangement and spacers to form a uniform bead (common substrates referenced in related standards include mortar, anodized aluminium or glass).
• Conditioning: defined conditioning routes (examples include standard ambient curing and optional ageing cycles such as heat/water exposure) before testing to simulate in-service cure and exposure.
• Typical elongations: standard tests commonly use elongations such as 25 %, 60 % and 100 % (values depend on specimen width and test program).
• Apparatus and measurement: tensile/extension device with controlled speed, thermally controlled oven and measuring instruments with appropriate resolution (e.g., calipers); tests performed at standard laboratory conditions (around 23 °C, 50 % RH) unless otherwise specified.
• Calculation: elastic recovery R (%) expressed as R = (We − Wr) / (We − Wi) × 100, where Wi = initial width, We = width under elongation, Wr = width after recovery. Report the arithmetic mean of at least three specimens.
• Reporting: include laboratory identification, date, reference to ISO 7389, sealant type and batch, substrates and primers used, conditioning method, elongation applied, individual and mean recoveries, and any deviations from the method.

Typical use and users

Used by sealant manufacturers (product development and QC), independent test laboratories, certification bodies, architects and specifiers evaluating sealant performance, façade and glazing contractors, and standards committees. It supports classification requirements in broader sealant performance standards and product datasheets.

Related standards

Commonly used alongside and referenced by other sealant standards, including ISO 11600 (sealant classification), ISO 8339 / ISO 8340 (tensile properties), ISO 7390 (resistance to flow), ISO 9046 / ISO 9047 (adhesion/cohesion tests), ISO 13640 (specifications for test substrates), EN/ISO adaptations (e.g., EN ISO 7389 / EN ISO 11600) and regional test methods or specifications (for example ASTM equivalents such as ASTM C920 and related test methods).

Keywords

elastic recovery, sealant, jointing products, recovery test, conditioning, tensile extension, building construction, ISO 7389, sealant testing, performance test

FAQ

Q: What is this standard?

A: ISO 7389:2002 is an International Standard that specifies a laboratory method for determining the elastic recovery of cured sealants after a period of maintained extension.

Q: What does it cover?

A: It covers specimen preparation, conditioning, the elongation-and-release test procedure, measurement and calculation of elastic recovery (reported as a percentage), and required information for test reports.

Q: Who typically uses it?

A: Sealant manufacturers, independent testing laboratories, certification bodies, specifiers and contractors who need a standardized measure of a sealant’s ability to recover after deformation.

Q: Is it current or superseded?

A: ISO 7389:2002 is the current published edition of this method (published October 2002). It has been maintained through ISO systematic review processes; users should check their national adoption or more recent editions/adoptions for region-specific publication dates or amendments.

Q: Is it part of a series?

A: Yes — it is one of several ISO test methods and classification standards for sealants and jointing products. It is commonly used together with ISO 11600 (classification), ISO 8339/8340 (tensile tests), ISO 7390 (flow), ISO 9046/9047 (adhesion/cohesion) and substrate specifications such as ISO 13640.

Q: What are the key keywords?

A: Elastic recovery, sealant, jointing products, testing, conditioning, recovery percentage, ISO 7389, building construction.