Overview
SIST EN ISO 9047:2008 is a European and International Standard specifying methods for determining the adhesion and cohesion properties of sealants used in building construction joints. This standard targets sealants exhibiting predominantly elastic behavior and evaluates their performance under variable temperature conditions. Developed by ISO Technical Committee ISO/TC 59 and adopted by CEN, the standard provides a controlled procedure to assess how sealants maintain bonding integrity when subjected to thermal cycling-ranging from cold to hot environments typical in real construction scenarios.
This standard ensures that sealants used in buildings meet stringent quality and durability requirements, improving joint performance, weatherproofing, and overall structural reliability.
Key Topics
-
Scope and Application
The standard applies to jointing products with elastic sealants used in building construction joints. It defines a clear method for testing adhesion (bond between sealant and substrate) and cohesion (internal strength of the sealant) at varying temperatures.
-
Test Specimen Preparation
Sealing material is applied between two parallel substrate surfaces such as mortar, anodized aluminium, or glass. Detailed specimen dimensions and use of non-adherent spacers ensure consistency.
-
Conditional Methods
Two conditioning procedures simulate environmental stresses:
- Method A: Conditioning at room temperature (23°C ± 2°C, 50% ± 5% relative humidity) for 28 days.
- Method B: An accelerated regimen involving cycles of high temperature (70°C), water immersion (23°C), and repeat exposure to hot and wet conditions to assess sealant endurance against heat and moisture.
-
Cyclic Extension and Compression Testing
Specimens undergo repetitive extension and compression cycles at temperatures varying from −20°C to 70°C. This emulates thermal movement stresses on joints and measures sealant elasticity, adhesion loss, or cohesive failure.
-
Measurement and Evaluation
After testing, specimens are inspected for adhesive or cohesive failures, with precise measurement of any loss to 0.5 mm accuracy. Results guide acceptance decisions for sealant suitability in building applications.
-
Reporting Requirements
Test reports must include critical data such as sealant type, batch, conditioning method, test amplitudes, detailed failure descriptions, and any deviations from the standard procedure.
Applications
-
Sealant Quality Control
Manufacturers utilize EN ISO 9047 to validate the performance and durability of elastic sealants before market release, ensuring compliance with customer and regulatory requirements.
-
Construction Product Assessment
Building professionals and specifiers rely on this standard to verify that selected sealants maintain functional adhesion and cohesion throughout temperature fluctuations common in outdoor and indoor environments.
-
Research and Development
The standard serves as a benchmark method to innovate new sealant formulations that can withstand extreme climate conditions, ultimately enhancing building durability and energy efficiency.
-
Regulatory Compliance
Harmonization with EN ISO 9047 supports conformity assessment procedures for construction products within the European Union and internationally, facilitating market access.
Related Standards
- ISO 6927:1981 – Defines terminology related to sealants and jointing products, ensuring consistent vocabulary.
- ISO 13640 – Specifies requirements for test substrates used in sealant testing, providing uniform test conditions.
- EN 1279-4 – Addresses sealant testing specific to insulating glass units, complementing EN ISO 9047 for specialized applications.
By adhering to SIST EN ISO 9047:2008, stakeholders in building construction can ensure that elastic joint sealants perform reliably under dynamic temperature conditions, thereby enhancing the longevity and integrity of construction joints. This standard is essential reading for sealant manufacturers, testing laboratories, construction engineers, and quality assurance professionals.