What Is ASTM D4798 Accelerated Weathering?
ASTM D4798 defines test conditions and procedures for evaluating the weathering performance of materials exposed to accelerated environmental conditions. The test simulates the effects of sunlight, temperature, and moisture to assess material durability and resistance to outdoor exposure.
This method is commonly used to predict long-term performance for plastics, coatings, and other nonmetallic materials. Accelerated weathering helps identify degradation such as fading, cracking, chalking, and loss of mechanical properties.
Applications and Benefits of ASTM D4798 Accelerated Weathering Testing
Scope
ASTM D4798 evaluates the resistance of materials to environmental degradation under controlled accelerated weathering conditions. The test helps determine how materials respond to combined exposure of light, heat, and moisture.
The test evaluates:
- Material degradation due to UV and visible light exposure
- Color change, fading, and surface deterioration
- Effect of temperature and moisture on material performance
- Cracking, chalking, and loss of surface integrity
- Long-term durability under simulated outdoor conditions
Applications
- Plastic and polymer materials
- Coatings, paints, and finishes
- Automotive exterior components
- Construction and building materials
- Outdoor consumer products
- Material research and development
Benefits
- Accelerates evaluation of weathering performance
- Helps predict long-term outdoor durability
- Identifies early signs of material degradation
- Supports material selection for exterior applications
- Enables comparison of weather resistance
Our ASTM D4798 Testing Procedure
Sample Preparation
Specimens are prepared, cleaned, and mounted to ensure uniform exposure.
1Exposure Setup
Samples are placed in a weathering chamber with controlled light, temperature, and moisture cycles.
2Accelerated Weathering
Materials are exposed to cycles of UV light, heat, and moisture for a defined duration.
3Data Recording & Evaluation
Changes in color, surface condition, and mechanical properties are recorded and analyzed.
4ASTM D4798 Test Parameters and Requirements
| Parameter | Details |
|---|---|
| Applicable Materials | Plastics, coatings, and nonmetallic materials |
| Light Source | Fluorescent UV lamps (UVA-340 or UVB-313) |
| Irradiance Level | ~0.68 W/m²/nm at 340 nm |
| Temperature Range | 50°C to 70°C (black panel) |
| Moisture Cycle | Condensation or water spray cycles |
| Exposure Duration | 250 to 2000+ hours |
- Accelerated weathering chamber (QUV tester)
- UV light source system
- Temperature and humidity control system
- Water spray or condensation setup
- Sample mounting racks
- Data acquisition and monitoring system
Equipment and Instrumentation Used for ASTM D4798 Testing
What You Receive: Test Report, Data, and Certification
- Material degradation analysis
- Color change and gloss retention data
- Surface cracking and chalking observations
- Durability performance evaluation
- Test condition summary
- ASTM compliance report
ASTM D4798 Accelerated Weathering FAQs
ASTM D4798 includes irradiance level, temperature, humidity, exposure duration, and cycle conditions, evaluating durability of bituminous materials under accelerated weathering using laboratory light sources and environmental control systems.
ASTM D4798 uses controlled light exposure, elevated temperature, and moisture cycles to simulate environmental weathering effects on bituminous materials, helping assess performance under outdoor conditions.
ASTM D4798 is commonly applied to bituminous roofing materials, asphalt products, and related materials used in construction requiring evaluation of weathering resistance.
ASTM D4798 evaluates changes such as cracking, embrittlement, color change, and loss of physical properties, providing insight into material durability under accelerated environmental exposure.
ASTM D4798 simulates weathering under controlled laboratory conditions and may not fully represent real outdoor environments where additional factors such as pollutants, mechanical stress, and varying climate conditions influence material degradation.
Why Choose Infinita Lab for Accelerated Weathering Testing
At the core of this breadth is our network of 2,000+ accredited laboratories across the USA, offering access to over 10,000 testing methods and analytical services. From advanced materials characterization (SEM, TEM, RBS, XPS) to mechanical, chemical, environmental, biological, and standardized ASTM/ISO-compliant testing, we deliver unmatched flexibility, specialization, and scale. You are never limited by geography, facility, or methodology — Infinita Lab connects you to the right expertise and testing solution, every time.
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