What Is a Xenon Test Apparatus Used for in ASTM G155 Testing?

In modern coatings and paint industries, product failure is often not caused in the lab—but after months or years of real outdoor exposure. Color fading, cracking, chalking, and gloss loss usually happen slowly, making traditional outdoor testing too time-consuming for R&D and quality control teams.

A recent customer from the Philippines shared positive feedback after relocating their LIB ASTM G155 G151 Accelerated Weathering Xenon Test Apparatus to a new site. In their words, “The chamber has been running smoothly after relocation to the new site. Temperature, humidity, and irradiance control are stable and reliable.” They also confirmed that operational issues were quickly resolved. With routine maintenance and proper calibration, they further reported that “the system continues to perform consistently.”

This article explains what a xenon test apparatus is, how it works in ASTM G155 testing, and how LIB's Xenon Wetherometer delivers standardized, repeatable, and globally recognized paint weatherability results.

Definition of a Xenon Test Apparatus

1. Why a Xenon Test Apparatus Was Developed

Natural sunlight, heat, humidity, and rain continuously degrade coatings and paints. However, real outdoor exposure testing can take 1–5 years to show visible results.

A xenon test apparatus was developed to compress long-term weathering into days or weeks, helping manufacturers quickly evaluate coating durability, color stability, and surface aging performance before product release.

Instead of waiting for real climate exposure, manufacturers simulate it in a controlled chamber using high-intensity xenon arc light.

2. Working Principle: Simulating Real Sunlight and Climate Stress

A xenon test apparatus uses a high-power xenon arc lamp (typically 4500W or 6500W water-cooled) to reproduce the full solar spectrum from 280 nm to 800 nm, which closely matches natural sunlight.

To improve accuracy, optical filters are applied:

• Daylight filter → simulates outdoor sunlight exposure

• Window glass filter → simulates indoor light aging through glass

• UV-enhanced filter → accelerates ultraviolet degradation

  
  

At the same time, the system controls:

• Temperature: 35–85°C (±2°C black panel control)

• Humidity: 50–98% RH (±5%)

• Water spray cycles for rain simulation

A rotating sample rack ensures every specimen receives uniform irradiation and moisture exposure, avoiding test deviation.

3. ASTM G155 Standard Requirements in Xenon Testing

Unlike salt spray testing (ASTM B117), xenon testing follows ASTM G155, which defines artificial weathering using xenon arc lamps.

Key ASTM G155 requirements include:

• Spectral range: 300–400 nm UV control band

• Irradiance control: typically 0.35–1.10 W/m²·nm

• Black panel temperature (BPT): controlled within defined setpoints

• Cyclic exposure: light, water spray, humidity, and darkness cycles

  
  

Common test cycles include:

• Cycle A (340 nm control):
  102 minutes light exposure + 18 minutes water spray

• Cycle B (420 nm control):
  Continuous irradiation at higher irradiance level

• Combined cycles: light + moisture + dark recovery phases

  
  

Additional supporting standards:

• ISO 11341 → coatings and varnish aging under xenon light

• ASTM D6695 → spectral and irradiance requirements

• ASTM D7869 → high-temperature humidity aging simulation (transport climate conditions like Florida exposure)

These standards ensure xenon testing results are globally comparable and certification-ready.

LIB Xenon Test Apparatus for ASTM G155 Coating Testing

LIB's Xenon Wetherometer is designed specifically for ASTM G155, ISO 11341, ASTM D6695, and ASTM D7869 compliance, making it suitable for high-precision paint weatherability testing.

1.  Standard Test Cycle (ASTM G155-Based Simulation)

LIB systems support programmable cycles such as:

• 0.51 W/m²·nm at 340 nm, 102 min light + 18 min spray

• 1.10 W/m²·nm at 420 nm, continuous light exposure

• Optional humidity + dark recovery cycles for extended aging simulation

These cycles replicate real environments such as:

• Outdoor UV exposure

• Rain + sunlight alternation

• High-temperature humidity aging

2. LIB ASTM G155 G151 Accelerated Weathering Xenon Test Apparatus Model Capabilities

A typical LIB Xenon Wetherometer includes:

Model	XL-S-750
Internal Dimension (mm)	950*950*850 mm
Overall Dimension (mm)	1400*1400*1950 mm
Specimen Holder Size(mm)	95*180
Specimen Capacity	42pcs
Chamber Type	Rotating Holder
Irradiation Source	1 piece of 4500w water-cooled xenon arc lamp
Irradiance Range	35~150 W/㎡
Bandwidth Measurement	300nm~400nm (340nm or 420nm)
Chamber Temperature Range	Ambient ～ 100 ℃ ±2℃
Black Panel Temperature	BPT 35 ～ 85 ℃ ±2℃
Humidity Range	50% ~ 98% RH
Humidity Deviation	± 5% RH
Water Spray Cycle	1~9999H59M  (Adjustable)
Controller	Programmable color LCD touch screen controller
Water supply system	Automatic water supply, Water purification system
Radiometer	UV Radiometer, Tolerance: ±5%
Cooling System	Mechanical compression refrigeration system
Safety Device	Over-temperature Protection; Over-current Protection; Water Shortage Protection; Earth leakage Protection; Phase Sequence Protection
Exterior Material	Steel plate with protective coating
Interior Material	SUS304 Stainless steel

3. Key Advantages of LIB Xenon Test Apparatus

①High-accuracy solar simulation
Full-spectrum xenon lamp + optical filters ensure close matching with real sunlight, improving correlation with outdoor exposure results.

②Stable environmental control
Temperature accuracy ±2°C and humidity control up to 98% RH ensure repeatable test conditions across long cycles.

③High-throughput testing capacity
Rotating rack holds up to 42 samples, improving laboratory efficiency and reducing test time per batch.

④Full data traceability and automation
Real-time irradiance, temperature, and humidity logging with automatic export supports ISO and ASTM audit requirements.

In one industrial coating validation project, LIB xenon systems helped reduce outdoor testing validation time from 12 months to under 45 days, significantly accelerating product release cycles.

LIB Xenon Test Apparatus vs UV Weathering Chamber: How to Choose

Both xenon and UV test chambers simulate aging, but their applications are different.

• Choose xenon testing when real-world accuracy and certification compliance are critical

• Choose UV testing when rapid screening and cost efficiency are priorities

Many laboratories use both: UV for early screening, xenon for final validation.

4. FAQs on LIB Xenon Test Apparatus

Q1: What standards does LIB Xenon Wetherometer support?

It fully supports:

• ASTM G155

• ISO 11341

• ASTM D6695

• ASTM D7869

These ensure internationally recognized weathering test results.

Q2: What is the delivery time for LIB equipment?

Standard production and shipping time is typically 7–15 working days, depending on configuration and destination.

Q3: What after-sales service does LIB provide?

LIB provides:

• 3-year warranty

• Lifetime technical support

• 24/7 English-speaking service team

• Free replacement for unresolved warranty issues

Q4: Can LIB support remote installation and training?

Yes. LIB provides:

• Remote video installation guidance

• Operation training

• Test program setup support (ASTM cycles included)

Q5: Is water consumption high during testing?

No. LIB uses a closed-loop water circulation system with filtration and recycling, reducing water consumption by up to 30%–80% depending on cycle configuration.

A xenon test apparatus is essential for replicating real sunlight, temperature, humidity, and rain exposure in a controlled laboratory environment. In ASTM G155 testing, it ensures coatings and paints are evaluated under internationally standardized conditions, delivering reliable aging data for product development and certification.

LIB's Xenon Wetherometer combines precision control, ASTM compliance, automation, and high-throughput design, making it a complete solution for modern paint weatherability testing.

Contact LIB Industry for a tailored xenon weathering solution that meets your testing standards and laboratory needs.