ASTM G155 Xenon Arc Weathering Testing Services
The ASTM G155 provides guidelines for using xenon arc light and water apparatus to replicate weathering effects on nonmetallic materials caused by sunlight and moisture exposure.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM G155 is a standard test method for employing Xenon Arc light apparatus to replicate outdoor weathering on non-metallic materials. It accelerates aging by subjecting them to regulated sunlight (UV, visible, IR), heat, and moisture (rain/humidity) to evaluate durability, colorfastness, and resistance to degradation, which is essential for industries such as automotive, paints, and textiles.
This test method is generally applicable to determine changes in physical, mechanical, or aesthetic properties of materials exposed to light, heat, and moisture. ASTM G155 allows assessment of material durability, colorfastness, surface degradation, and resistance against cracking or chalking under simulated long-term environmental exposure conditions in the laboratory. It also allows evaluation of uniformity across multiple samples.
Scope, Applications, and Benefits
Scope
ASTM G155 characterizes the effects of ultraviolet radiation, visible light, heat, and moisture on nonmetallic materials. This practice is often utilized to:
Determine the durability of coatings, plastics, and polymer-based materials.
Compare the performance among different material formulations or protective coatings.
Support product development, quality control, and research in materials science.
Applications
- Testing plastics, polymers, and elastomers for outdoor durability.
- Evaluation of coatings, paints, and surface finishes for weather resistance.
- Assessment of automotive interior and exterior components.
- Performance testing of textiles, films, and packaging materials.
- Qualification of construction materials such as roofing, siding, and sealants.
- Comparative weathering studies for R&D and material selection.
Benefits
- Simulates real-world sunlight exposure by reproducing full-spectrum UV, visible light, and heat
- Provides accelerated aging data to predict long-term material performance
- Helps evaluate color stability, gloss retention, and surface degradation
- Enables comparison of weathering resistance across different materials and formulations
- Supports quality control and product development by identifying weak formulations early
- Enhances confidence in outdoor durability and service-life estimation.
Testing Process
Specimen Preparation
Flat or molded specimens with clean, contaminant-free surfaces.
1Apparatus Setup
Specimens are placed in a xenon arc chamber with controlled irradiance, temperature, and humidity.
2Exposure Cycles
Alternating light and light-with-moisture cycles under defined conditions.
3Evaluation
Assessment of visual degradation and changes in material properties after exposure.
4Technical Specifications
| Parameter | Details |
|---|---|
| Sample Types | Polymers, coatings, plastics, rubber, textiles |
| Sample Size | Typically, 75 mm × 150 mm sheets or 50 mm × 50 mm plaques |
| Exposure Medium | Xenon arc light with UV and visible spectrum simulation |
| Temperature Control | Black panel temperature 50–80°C (typical) |
| Irradiance | 0.35–0.70 W/m² at 340 nm (adjustable depending on material) |
| Test Duration | From hours to thousands of hours, depending on the accelerated aging protocol. |
Instrumentation Used
- Xenon arc weathering test chamber
- Xenon arc lamp with optical filters
- Temperature and humidity control system
- Radiometer or irradiance monitoring system
- Specimen racks or holders
- Data acquisition and control software
Results and Deliverables
- Evaluates the relative resistance of nonmetallic materials to simulated outdoor weathering
- Assesses material performance under the combined effects of sunlight, moisture, and heat
- Test results are influenced by polymer composition, colorants, fillers, coatings, and additives
- Provides insight into durability through changes in appearance, mechanical properties, and chemical characteristics
- Helps compare the weathering performance of different materials and formulations.
Frequently Asked Questions
This test applies to polymers, plastics, coatings, rubbers, textiles, and other nonmetallic materials. It is particularly useful for materials exposed to outdoor conditions.
Specimens should have smooth, clean surfaces free from dust, oils, or debris. Common sizes include 75 mm × 150 mm sheets or 50 mm × 50 mm plaques, depending on material and apparatus capacity.
The standard uses alternating light-only periods and light-with-moisture periods to simulate day-night cycles, rainfall, or dew. The cycle includes controlled irradiance, temperature, and humidity.
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