ISO 4892-2:2013

Overview

ISO 4892-2:2013 - Plastics - Methods of exposure to laboratory light sources - Part 2: Xenon‑arc lamps - specifies laboratory methods for exposing plastic specimens to xenon‑arc radiation in the presence of moisture to reproduce weathering effects caused by daylight (or daylight filtered through window glass). It is a core reference for accelerated weathering and UV exposure testing using xenon‑arc lamps, defining apparatus, exposure conditions, measurement methods and reporting requirements for reliable, comparable results.

Key topics and technical requirements

• Scope and principle: Simulate the spectral irradiance of natural daylight (UV through visible) using xenon‑arc lamps fitted with filters to reproduce either direct daylight or daylight filtered by window glass.
• Apparatus: Requirements for the xenon‑arc light source, test chamber, radiometer, black‑standard/black‑panel thermometer, wetting/humidity control, specimen holders and property‑assessment equipment.
• Filters and spectral irradiance: Use of daylight filters (method A) and window‑glass filters (method B) to meet target relative spectral irradiance (based on CIE No. 85); spectral measurements typically cover 250–400 nm for compliance checks.
• Irradiance and uniformity: Measurement of UV irradiance and radiant exposure in the specimen plane; irradiance across the exposure area must be at least 80% of the maximum.
• Environmental control: Control of specimen temperature, chamber relative humidity, spray/immersion/condensation wetting cycles and light/dark cycling to reproduce realistic weathering stresses.
• Procedure and reporting: Specimen mounting, measurement of radiant exposure, and documented exposure reports. Recommendation to include a control material of known performance. Intercomparison across different apparatus requires established statistical relationships.

Practical applications and users

ISO 4892-2 is used for:

• Accelerated weathering testing of plastics, paints, coatings, adhesives and composite materials.
• Product development and material selection to assess UV stability, color change, cracking, embrittlement and loss of mechanical performance.
• Quality assurance and batch testing in manufacturing sectors such as automotive, construction (cladding, glazing), consumer goods and outdoor equipment.
• Research and regulatory compliance in laboratories performing standardized durability testing and comparative evaluations.

Primary users include materials scientists, QA/QC engineers, third‑party testing laboratories, R&D teams and standards professionals focused on accelerated aging, xenon‑arc testing and UV exposure assessment.

Related standards

• ISO 4892-1 (General guidance)
• ISO 11341 (paints and varnishes)
• ISO 4582 (colour change determination)
• ISO 9370 (instrumental determination of radiant exposure)
• CIE Publication No. 85 (solar spectral irradiance reference)

Keywords: ISO 4892-2, xenon‑arc lamps, accelerated weathering, plastics testing, UV exposure, spectral irradiance, irradiance uniformity, laboratory light sources.