Overview
ISO 4892-3:2016 - Plastics: Methods of exposure to laboratory light sources - Part 3: Fluorescent UV lamps specifies laboratory procedures for exposing plastic (and related) test specimens to fluorescent UV radiation, heat and water to simulate weathering caused by solar radiation (direct or through window glass). It defines the types of fluorescent UV lamps used, controlled environmental parameters, measurement requirements and general exposure principles. Specimen preparation and result evaluation are covered by material-specific standards; ISO 4892-1 gives general guidance.
Key topics and requirements
- Lamp types and spectral characteristics: Defines three main lamp types and their intended simulation:
- UVA-340 (type 1A) - peak ~343 nm, <1% emission below 300 nm; used to simulate global solar UV (300–340 nm).
- UVA-351 (type 1B) - peak ~353 nm, <1% emission below 310 nm; used to simulate solar UV through window glass.
- UVB-313 (type 2) - peak ~313 nm, >10% emission below 300 nm; may be used only by agreement and can produce wavelengths (e.g., 254 nm) not present in end-use solar spectra.
- A four-lamp combination (with filters) is also described for specialized needs.
- Controlled environment parameters: Requires specification and control of irradiance, black-panel/black-standard temperature, humidity/condensation and wetting (spray or condensation) cycles. Radiometers and temperature sensors are used to measure radiant exposure and black-panel temperature.
- Irradiance management and lamp aging: Lamps age and spectral output changes; the standard requires following manufacturer maintenance/rotation recommendations or using automatic irradiance control to maintain target irradiance.
- Uniformity and specimen handling: Irradiance uniformity limits and specimen repositioning protocols follow ISO 4892‑1; a control material is recommended to be exposed concurrently.
- Measurement and reporting: Measurement of spectral irradiance and radiant exposure in the specimen plane is specified; the test report must state lamp type, exposure conditions and any deviations (e.g., use of UVB-313).
Applications and users
ISO 4892-3:2016 is used by:
- Materials testing laboratories performing accelerated weathering of plastics, polymers, elastomers and other organic materials.
- Product manufacturers (automotive, building materials, consumer goods) for R&D, quality control and formulation screening.
- Coatings and paint formulators (see ISO 11507 for coatings-specific guidance).
- Regulatory and certification bodies evaluating UV durability claims.
Practical uses include ranking material or coating durability, comparing formulations, and simulating indoor vs. outdoor solar ageing (through choice of lamp type).
Related standards
- ISO 4892-1 - General guidance for laboratory light source exposure methods
- ISO 11507 - Fluorescent UV exposures for paints, varnishes and coatings
- ISO 4582 - Determination of colour change and property variations after exposure
- CIE Publication No. 85 - Reference global solar spectral irradiance used for lamp comparison
Keywords: ISO 4892-3:2016, fluorescent UV lamps, accelerated weathering, plastics testing, UVA-340, UVA-351, UVB-313, irradiance, radiant exposure.