How Does Light Affect The Aging Test Of Materials?

Outdoor materials fail quietly at first. Colors fade, surfaces crack, coatings lose gloss, and plastics become brittle long before complete failure is visible. These changes are driven not only by heat or moisture, but by continuous exposure to light energy, especially ultraviolet radiation. Without controlled light aging tests, manufacturers cannot accurately predict how materials will perform after months or years of real-world exposure.

LIB Light Aging Test Chambers are designed to quantify and accelerate these light-induced aging processes under internationally recognized standards. By precisely controlling spectrum, irradiance, temperature, humidity, and water spray, LIB enables laboratories to reproduce years of natural weathering in a controlled, repeatable, and certifiable laboratory environment.

Xenon arc light	Halogen light	UV fluorescent light

Xenon arc light provides the most realistic simulation of natural sunlight. Xenon lamps reproduce the full solar spectrum from 280 nm to 800 nm, covering UV, visible, and infrared radiation. Because of this, xenon light is specified in major standards such as ASTM G155, ASTM D6695, ISO 11341, and ISO 4892-2 for testing coatings, plastics, automotive interiors, and exterior materials exposed to outdoor environments.

Halogen light has a limited but defined role in specific international standards. While halogen lamps emit strong visible and infrared radiation, they produce minimal ultraviolet energy below 400 nm, which is critical for polymer photo-degradation. Therefore, halogen light is not used as a primary source in material aging standards such as ASTM G154, ASTM G155, ISO 4892-2, or ISO 4892-3. However, halogen lamps are specified in IEC 61215 for photovoltaic module testing, where the focus is on electrical performance and thermal stress under simulated irradiance, rather than long-term UV-driven material aging. As a result, halogen light is applicable in PV qualification tests but is rarely accepted for material weathering or durability certification.

UV fluorescent light focuses on accelerated UV damage rather than full-spectrum sunlight simulation. UV lamps such as UVA-340, UVB-313, and UVA-351 concentrate energy within the 300–400 nm wavelength range, where polymer molecular bond breakage occurs most rapidly. UVA-340 closely matches the UV portion of natural outdoor sunlight, UVA-351 simulates UV radiation filtered through window glass for indoor applications, while UVB-313 delivers higher-energy short-wave UV to aggressively accelerate degradation. International standards including ASTM G154, ASTM D4329, ASTM D4587, ISO 4892-3, and SAE J2020 define UV fluorescent aging methods for rapid screening, formulation comparison, and durability evaluation, making UV aging chambers an efficient and economical tool for material performance assessment.

》》》For more technical information and details about our Light Aging Test Chambers, please feel free to email us at info@libtestchamber.com.

Material light aging tests using xenon arc chambers follow a structured, standards-driven workflow to ensure accuracy, repeatability, and global acceptance of results.

Step 1: Select the Applicable International Standard

Before testing begins, the correct standard must be defined based on material type and application.

Commonly supported standards include:

ASTM G155 – Xenon arc accelerated weathering

ASTM D6695 – Artificial weathering of coatings

ISO 11341 – Paints and varnishes aging by artificial light

ISO 4892-2 – Plastics exposed to xenon arc light

LIB advantage: The controller allows direct input of standard-defined parameters without manual conversion, reducing setup errors and ensuring compliance.

Step 2: Set Light Spectrum and Irradiance

Standards specify precise irradiance levels, such as:

• 0.35 W/m²·nm at 340 nm (daylight simulation)
• 1.10 W/m²·nm at 420 nm (window-glass filtered light)

LIB xenon chambers use 4500 W water-cooled xenon lamps with interchangeable optical filters.

LIB advantage: Water-cooled lamps maintain irradiance stability within ±3 %, even during long test cycles exceeding 1000 hours.

xenon lamp and filters

Step 3: Control Temperature and Humidity

Light aging is strongly influenced by thermal and moisture stress. Standards such as ASTM G155 require control of:

• Black Panel Temperature (BPT): 35–85 °C
• Relative Humidity: 50–98 % RH

LIB advantage: Direct BPT sensor feedback ensures surface-level accuracy rather than relying solely on chamber air temperature.

Step 4: Apply Water Spray and Wet/Dry Cycles

Water accelerates photo-oxidation, coating erosion, and micro-cracking.

LIB chambers support:

• Adjustable spray rates up to 0.35 ml/cm²/min
• Programmable cycles from 1 minute to 9999 hours

LIB advantage: A closed-loop deionized water system maintains spray purity while reducing water consumption and maintenance frequency.

Control system	Rain spray system

Step 5: Ensure Uniform Exposure and Data Recording

Uniform exposure is critical for reliable comparison.

LIB advantage: Rotating specimen racks hold up to 42 samples, ensuring even light, temperature, and moisture distribution. Continuous

data logging via USB or Ethernet provides traceable records for audits and certification bodies.

》》》To receive customized solutions and pricing for the UV Aging and Xenon Aging Test Chambers, please contact us at info@libtestchamber.com.

Choosing between UV aging and xenon aging test chambers depends largely on the testing objective, development stage, required realism, and applicable standards.

UV aging testing is generally more aggressive but less representative of real-world exposure. UV chambers concentrate radiant energy in short ultraviolet wavelengths-most notably UVB-313-which significantly accelerates photochemical degradation mechanisms such as polymer chain scission, color fading, surface cracking, and loss of mechanical strength. Because of this intensified exposure, UV aging tests can produce results in a relatively short period of time. This makes UV chambers particularly suitable for rapid material screening, formulation optimization, and comparative studies during early product development. UV aging is widely conducted in accordance with ASTM G154 and ISO 4892-3, especially for plastics, coatings, rubber, and polymer composites.

Precision Testing for UV Resistance

Xenon aging testing, by contrast, is slower but far more representative of natural outdoor weathering conditions. Xenon arc lamps closely replicate the full solar spectrum, including ultraviolet, visible, and infrared radiation, while also allowing precise control of temperature, humidity, and water spray. This comprehensive simulation makes xenon aging chambers essential for evaluating long-term outdoor durability, color stability, gloss retention, and functional performance under realistic service conditions. As a result, xenon testing is commonly required for automotive exterior components, architectural coatings, construction materials, and consumer products where real-world exposure claims must be validated. Typical standards include ASTM G155 and ISO 11341.

In practical laboratory workflows, UV and xenon aging tests are often used in combination rather than as substitutes. UV aging chambers are employed during early-stage development to quickly identify weak formulations and guide material selection, while xenon aging chambers are used for final qualification, certification, and customer-facing performance claims, particularly when long-term outdoor exposure behavior must be demonstrated with high credibility. This complementary approach balances testing efficiency, cost control, and predictive accuracy.

why choose our products

 

1. Advanced Xenon Arc Test Chambers

2. 4500W Water Cold Xenon Lamp

3. High-Precision UV Accelerated Weathering Tester

4. UV Exposure Chamber For Cables

5. UV Preconditioning Test Chamber

6. Environmental Chamber with Precise Temperature Humidity Control

1. What is the maximum sample thickness supported by the standard xenon rack?
The standard rotating rack supports samples up to 30 mm thick. Customized racks can accommodate specimens up to 110 mm.

2. Does an empty chamber affect humidity uniformity?
No. LIB's airflow design maintains stable humidity even when the chamber is partially loaded.

3. Can water spray be applied from both sides of the samples?
Yes. Front spray is standard, and rear spray is available as an option for enhanced wet exposure.

4. Where are the temperature sensors located in UV chambers?

Temperature sensors are positioned directly beneath the UV lamps to monitor the active exposure zone accurately.

5. What is the typical service life of the lamps?
Xenon lamps typically operate for 1600 hours, while UV fluorescent lamps last approximately 5000 hours.

LIB Light Aging Test Chambers combine standards-compliant design, intelligent PID control, and industrial-grade construction to deliver repeatable and certifiable results. Supporting ASTM, ISO, SAE, and automotive OEM standards, LIB systems help manufacturers transform laboratory aging data into confident real-world durability decisions.

Any customization can be made. LIB offers a 3-year warranty and lifetime service. Any issues that cannot be resolved during the warranty period will be replaced free of charge. 24/7 English-speaking after-sales team. Fast shipping within 7-15 days.

Contact LIB Industry to build a professional, standards-compliant light aging and environmental testing solution tailored to your application.