EN ISO 4892-3:2024 specifies laboratory methods for exposing plastic specimens to fluorescent UV lamps, together with controlled heat and water, to simulate the weathering effects of real-world sun or window-glass filtered solar radiation. This fifth-edition standard (adopted by CEN in October 2024) updates the previous 2016 version and provides procedures, apparatus requirements and reporting guidance for accelerated UV-weathering tests on plastics.
Key topics and technical requirements
- Scope & principle: Uses fluorescent UV lamps to reproduce the short-wavelength UV component of solar radiation and combines UV, temperature and wetting cycles to simulate outdoor degradation.
- Apparatus: Requirements for laboratory light sources, test chambers (two fundamental types are clarified), radiometers and specimen holders - including control of temperature, humidity and wetting systems (condensation and spray).
- Test conditions: Guidance on selecting lamp type, irradiance level, exposure temperature, wetting mode and cycle design. Annexes describe condensation-type and climatic chamber devices and provide alternative test cycles.
- Measurement & control: Use of radiometers to measure radiant exposure and procedures for lamp maintenance/rotation and temperature control.
- Procedure & reporting: Mounting, exposure, measurement of radiant exposure, determination of changes in properties and required test report contents.
- ** normative & informative content**: Includes normative references (e.g., ISO 4892-1, ISO 4582), terms and definitions, plus informative annexes and bibliography.
- 2024 revisions: Clarifications on chamber types, new Annexes B–D, update to CIE reference (CIE 241), and removal of certain lamp type designations and combinations.
Practical applications and users
This standard is essential for organizations needing reproducible accelerated weathering data for plastics:
- Plastics manufacturers assessing UV stability, discoloration, embrittlement or loss of mechanical properties.
- Product developers and formulation chemists validating additives (UV stabilizers, antioxidants) and resin choices.
- Testing laboratories and certification bodies conducting standardized accelerated weathering tests for specifications and quality assurance.
- R&D and failure analysis teams investigating outdoor degradation mechanisms and lifetime prediction.
Common applications include testing of housings, outdoor components, building materials, films and other plastic parts exposed to sunlight or window-filtered solar radiation.
Related standards
- ISO 4892-1 - General guidance for laboratory light source exposure methods.
- ISO 4582 - Determination of changes in colour and property variations after exposure.
- ISO 16474-3 - Fluorescent UV lamp exposures for paints, varnishes and other coatings.
Keywords: EN ISO 4892-3:2024, ISO 4892-3, fluorescent UV lamps, plastics weathering, accelerated weathering, laboratory light sources, UV exposure, test chambers, irradiance.