ASTM G151 Standard Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources

ASTM G151 protocol outlines the general processes to be followed when exposing nonmetallic materials to laboratory light sources in accelerated test equipment. Practices ASTM G152, G153, G154, and G155 provide extensive information on exposures in devices that employ open flame carbon arc, enclosed carbon arc, xenon arc, and fluorescent UV light source, respectively.

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ASTM G151 Standard Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources

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Overview
Scope, Applications, and Benefits
Test Process
Specifications
Instrumentation
Results and Deliverables

Overview

ASTM G151 provides a standardized practice for exposing nonmetallic materials to laboratory light sources in accelerated test devices. The method defines how to simulate environmental conditions such as sunlight, temperature, and moisture to evaluate material durability and weathering performance.

This practice is widely used for plastics, coatings, textiles, and other nonmetallic materials to assess degradation caused by light exposure and environmental conditions. It supports predicting long-term performance and helps identify changes such as discoloration, cracking, and loss of material properties.

Scope, Applications, and Benefits

Scope

ASTM G151 establishes procedures for exposing nonmetallic materials to controlled light sources under defined environmental conditions. The practice ensures consistent, repeatable testing to evaluate weathering effects on materials.

ASTM G151 evaluates:

Effects of ultraviolet and visible light on materials
Material degradation under accelerated weathering conditions
Influence of temperature and moisture on material performance
Changes in physical and visual properties
Durability of nonmetallic materials in simulated environments

Applications

Plastic and polymer materials
Coatings, paints, and finishes
Textile and fabric materials
Automotive exterior components
Building and construction materials
Research and material development

Benefits

Provides standardized procedures for accelerated exposure testing
Helps predict long-term material performance
Supports comparison of material durability
Assists in selecting materials for outdoor applications
Enables the evaluation of environmental degradation behavior

Test Process

Sample Preparation

Nonmetallic specimens are prepared and conditioned according to the specified requirements.

Exposure Setup

Samples are placed in an accelerated weathering device with controlled light and environmental settings.

Light Exposure

Specimens are exposed to laboratory light sources under defined temperature and moisture conditions.

Data Recording & Evaluation

Material changes such as color, cracking, and surface degradation are recorded and analyzed.

Technical Specifications

Parameter	Details
Applicable Materials	Nonmetallic materials including plastics, coatings, and textiles
Light Source	Laboratory-controlled light sources
Environmental Conditions	Temperature, humidity, and moisture exposure
Irradiance Level	Typically 0.35–1.55 W/m²/nm at 340 nm
Temperature Range	40°C to 80°C (black panel temperature)
Humidity Range	50% to 95% relative humidity

Instrumentation Used for Testing

Accelerated weathering chamber
Laboratory light source system
Temperature and humidity control system
Water spray or condensation system
Sample mounting fixtures
Data acquisition and monitoring system

Results and Deliverables

Material degradation results
Color and appearance change data
Surface condition evaluation
Environmental exposure summary
Test condition summary
ASTM compliance report

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Frequently Asked Questions

ASTM G151 includes irradiance level, spectral distribution, exposure time, temperature, humidity, and cycle conditions, providing standardized guidance for exposing nonmetallic materials in accelerated devices using laboratory light sources simulating environmental weathering effects.

ASTM G151 covers laboratory light sources such as xenon arc lamps, fluorescent UV lamps, and carbon arc devices, used to simulate sunlight and environmental exposure during accelerated weathering testing.

ASTM G151 is commonly applied to plastics, coatings, rubber, textiles, and other nonmetallic materials used in outdoor environments where resistance to sunlight and weathering is critical.

ASTM G151 evaluates material changes including color fading, cracking, embrittlement, gloss loss, and mechanical property degradation resulting from exposure to simulated environmental conditions.

ASTM G151 provides general exposure guidance and does not define specific test cycles, requiring additional standards to establish detailed conditions for particular materials and performance requirements in accelerated weathering studies.