ASTM G151: Accelerated Weathering Laboratory Light Testing Services

Accredited ASTM G151 accelerated weathering laboratory light testing from Infinita Lab, performed to the exact standard requirements - accurate, reproducible results with full documentation for compliance, R&D, and quality control programs.

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ASTM G151: Accelerated Weathering Laboratory Light Testing Services

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

What Is ASTM G151 Accelerated Weathering Laboratory Light?

ASTM G151, Standard Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources, is a general practice that defines the common procedures, terminology, and performance principles shared by every laboratory-light accelerated weathering method. It does not specify a stand-alone exposure cycle or a single device; instead, it establishes the framework of general exposure procedures, apparatus performance requirements, and result-interpretation guidance that device-specific standards build upon. Those device-specific standards include ASTM G154 (fluorescent UV lamp apparatus), G155 (xenon arc light apparatus), G152 (open-flame carbon arc apparatus), and G153 (enclosed carbon arc apparatus). In practice, G151 is always applied together with one of these companion standards rather than used on its own, since G151 covers what is common to all the devices while the companion standard covers the specific lamp type, filter combination, and exposure cycle to be run.

Within this framework, G151 addresses specimen preparation and mounting, the use of replicate, control, and reference specimens, irradiance and spectral monitoring and calibration practices, and the control of exposure temperature and moisture delivery methods such as humidity, water spray, or condensation. It also provides guidance on how to schedule specimen evaluations, how to compare accelerated results against outdoor exposure or historical performance data, and cautions that accelerated laboratory results correlate to relative material performance rather than to a guaranteed service life.

Infinita Lab connects manufacturers of coatings, plastics, rubbers, textiles, and other nonmetallic materials to accredited laboratories that apply ASTM G151 alongside the appropriate device-specific practice, generating consistent, defensible weatherability data to support material selection, product development, and quality assurance programs.

Applications and Benefits of ASTM G151 Accelerated Weathering Laboratory Light Testing

Scope

Establishes general procedures common to all accelerated laboratory-light exposure devices used to test non-metallic materials.
Applies alongside device-specific practices such as G154 (fluorescent UV), G155 (xenon arc), G152 (open-flame carbon arc), and G153 (enclosed carbon arc).
Covers specimen preparation, mounting, and the use of control, reference, and replicate specimens to reduce test variability.
Addresses irradiance and spectral power distribution monitoring, along with instrument calibration expectations.
Describes control of exposure temperature, including black-panel or black-standard temperature monitoring practices.
Describes moisture-delivery approaches used in laboratory devices, such as humidity control, water spray, and condensation.
Provides guidance on scheduling specimen evaluations by elapsed time or by radiant exposure rather than by an arbitrary interval alone.
Explains how to report and interpret accelerated exposure results, including comparisons against natural outdoor weathering data where available.
Notes that laboratory-light exposure results indicate relative material performance and should not be treated as a direct prediction of field service life.
Applies to materials such as coatings, plastics, rubbers, textiles, adhesives, and other non-metallic products intended for outdoor or light-exposed use.

Applications

Screening candidate coating formulations for colour retention, gloss retention, and chalking resistance under simulated sunlight and moisture.
Evaluating plastic and polymer compounds for embrittlement, cracking, and mechanical property loss after simulated light exposure.
Assessing textile and fibre materials for fading, strength loss, and degradation from prolonged light exposure.
Supporting product development comparisons between reformulated materials and established baseline or competitor materials.
Generating accelerated weatherability data to complement outdoor exposure programs conducted under related ASTM and ISO practices.
Providing quality assurance data for manufacturers who need consistent, repeatable exposure conditions across production lots.
Supporting regulatory, warranty, and specification compliance documentation for construction, automotive, and consumer-product materials.

Benefits

Delivers standardised, repeatable exposure conditions that allow meaningful comparison between materials and formulations.
Reduces the ambiguity of comparing results generated on different types of accelerated weathering equipment.
Provides a documented basis for irradiance and instrument calibration that supports data defensibility.
Helps manufacturers identify durability issues earlier in development, reducing the risk of field failures.
Supports data correlation with device-specific standards and, where available, with outdoor exposure programs.
Strengthens technical documentation used in specifications, warranty claims, and regulatory submissions.

Our ASTM G151 Testing Procedure

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.

ASTM G151 Test Parameters and Requirements

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

Industries We Serve

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Xenon arc weathering chamber – Simulates full-spectrum sunlight exposure per ASTM G155 in conjunction with G151 general procedures.
Fluorescent UV weathering chamber – Simulates UV-dominant light exposure per ASTM G154 in conjunction with G151 general procedures.
Irradiance and spectral radiometer – Monitors and verifies light intensity and spectral distribution delivered to specimens.
Black-panel/black-standard temperature sensor – Tracks specimen surface temperature during exposure cycles.
Humidity and water-delivery control system – Manages relative humidity, spray, or condensation cycles within the exposure device.
Colorimeter/spectrophotometer – Measures colour and gloss change in exposed specimens against unexposed controls.
Mechanical testing equipment – Assesses tensile strength, elongation, and other mechanical property changes after exposure.

Equipment and Instrumentation Used for ASTM G151 Testing

What You Receive: Test Report, Data, and Certification

A detailed test report documenting the exposure device, companion standard applied, and exposure conditions used.
Interim and final evaluation data on the measured properties, such as colour, gloss, cracking, or mechanical performance.
Comparative analysis of exposed specimens against control and reference materials.
Supporting calibration and irradiance monitoring records for data defensibility.
Photographic or visual documentation of specimen condition at key evaluation intervals, where applicable.

ASTM G151 Accelerated Weathering Laboratory Light FAQs

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.

Test specimens are exposed to controlled light, temperature, and moisture in an accelerated weathering device. Changes such as discoloration, cracking, gloss loss, or strength reduction are measured to evaluate material durability.

ASTM G151 provides general procedures and equipment requirements for exposing materials to laboratory light sources under controlled conditions. Specific practices, such as G154 for fluorescent UV and G155 for xenon arc, define the exposure methods for particular devices.

Accelerated weathering exposes materials to controlled UV/light, heat, and moisture to reproduce weathering stresses more quickly than natural exposure. Material properties are measured before and after exposure to evaluate relative durability.

Why Choose Infinita Lab for Accelerated Weathering Laboratory Light Testing

When your Accelerated Weathering Laboratory Light results have to hold up - for compliance, a customer audit, or an engineering decision - ASTM G151 accuracy and an unbiased third-party report matter more than price. Infinita Lab routes your ASTM G151 accelerated weathering laboratory light testing to ISO/IEC 17025-accredited U.S. partner labs with hands-on method experience, so you get defensible data, transparent reporting, and turnaround times built around your project deadline - not ours.

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Send query us at hello@infinitalab.com or call us at (888) 878-3090 to learn more about our services and how we can support you.

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