SIST EN 479:2018

Overview

SIST EN 479:2018 is a European Standard developed by CEN that specifies the method for determining the heat reversion of unplasticized poly(vinyl chloride) (PVC-U) profiles at 100 °C in air. This standardized test method is crucial for evaluating the dimensional stability of PVC-based profiles when exposed to elevated temperatures. The standard is applicable to PVC-U profiles and can be adapted to other PVC-based profiles by adjusting temperature or test conditions accordingly. SIST EN 479:2018 supersedes the previous EN 479:1995 standard, reflecting updated procedures and requirements.

Key Topics

• Heat Reversion Measurement: The standard defines heat reversion as the percentage change in length of heat-exposed PVC profiles, an indicator of the material’s ability to maintain shape under thermal stress.
• Test Conditions: Testing is performed at a controlled temperature of 100 °C with forced air circulation, ensuring consistent exposure and heat transfer.
• Specimen Preparation: Profiles are prepared as minimum 250 mm samples, marked with two points 200 mm apart for precise measurement before and after heating.
• Test Procedure: Specimens are conditioned at room temperature, then heated for 1 hour at 100 °C, followed by cooling to ambient temperature for post-test length measurement.
• Result Calculation: Heat reversion (R) is calculated as a percentage using the difference between initial and final lengths relative to the initial length. Where applicable, differences between opposing surfaces (ΔR) are also assessed.
• Reporting Requirements: The test report must include details such as profile identification, test conditions, measurement data before and after heating, calculated heat reversion values, and any deviations or incidents during testing.

Applications

• Construction and Building Materials: Ensuring that PVC-U window, door, and façade profiles maintain their dimensional stability at elevated temperatures, which directly impacts durability and performance.
• Quality Control: Manufacturers of PVC-based profiles utilize this standard to evaluate and certify product compliance with European regulations and industry benchmarks.
• Product Development: Material scientists and engineers can apply the test to optimize formulations of PVC profiles for enhanced thermal resistance.
• Regulatory Compliance: SIST EN 479:2018 supports compliance with EU directives requiring performance standards for plastic profile materials used in building envelopes and other structural applications.
• Research and Testing Laboratories: Standardized procedures facilitate consistency in inter-laboratory comparisons and certification testing for PVC profile products.

Related Standards

• EN ISO 9001 – Quality management systems applicable to manufacturing of PVC profiles.
• EN 12608 – Rigid PVC compounds-Specifications for PVC-U profiles used in construction.
• EN 13245 – Plastics piping systems for water supply and drainage-Material requirements for PVC-U.
• CEN/TC 249 Plastics Standards – The technical committee responsible for PVC and other plastics standardization activities in Europe.

SIST EN 479:2018 represents a critical benchmark for assessing the thermal dimensional stability of PVC profiles, enhancing product reliability and safety in various applications, especially in the construction sector. Adhering to this standard helps ensure consistent quality, durability, and compliance with European regulatory requirements.