Astm Standard For Uv Resistance Test

Key ASTM Standards for UV Resistance and Weathering (2025)

When buyers in the U.S. ask for an “ASTM standard UV resistance test,” they are usually referring to one of the core accelerated weathering standards below. These are the active, commonly specified methods for plastics, coatings, and painted metals in 2025.

ASTM G154 – Fluorescent UV (QUV) Lamp Apparatus

ASTM G154 is the backbone standard for fluorescent UV testing. It defines how to operate a QUV-type chamber using fluorescent UV lamps (UVA-340, UVB-313, etc.) with controlled irradiance, temperature, and moisture (condensation or spray).

• Typical use: General outdoor durability, plastic parts, coatings, elastomers, building products
• Key features:
  • Fluorescent UV lamps with defined spectra
  • Cycles like 8 h UV at 60 °C + 4 h condensation at 50 °C
  • Irradiance control at 340 nm (for UVA-340)
• Why it matters: Many material and OEM specs simply say “test per ASTM G154,” so your chamber must truly meet its hardware and control requirements.

ASTM G155 – Xenon Arc Light Apparatus (Q-Sun)

ASTM G155 covers xenon arc weathering, which offers the closest simulation of full-spectrum sunlight (UV + visible + IR), typically used with filters that simulate window glass or daylight.

• Typical use: Automotive exterior and interior, architectural coatings, textiles, high-end plastics
• Key features:
  • Xenon arc lamps with appropriate filters (e.g., Daylight or Window Glass)
  • Control of irradiance, black standard temperature (BST), chamber temperature, and humidity
• Why it matters: When color, gloss, and appearance are critical—especially for automotive—G155 xenon testing is often mandatory.

ASTM D4329 – Fluorescent UV Exposure of Plastics

ASTM D4329 is a plastics-specific practice that uses the G154 fluorescent UV apparatus but adds detailed guidance tailored to plastic materials.

• Typical use: Outdoor plastics, housings, consumer products, electrical components
• Key features:
  • References apparatus and conditions from G154
  • Specifies cycles, exposure duration, and evaluation methods for plastics
• Why it matters: Many resin suppliers and molders in the U.S. specify “ASTM D4329, Method A/B” to qualify materials for outdoor use.

ASTM D4587 – UV-Condensation Exposures of Paint and Coatings

ASTM D4587 focuses on paints and organic coatings using a fluorescent UV/condensation device (again, based on ASTM G154 hardware).

• Typical use: Architectural paints, industrial coatings, OEM coatings
• Key features:
  • Fluorescent UV plus condensation cycles for coated panels
  • Detailed recommendations for panel preparation and evaluation
• Why it matters: Common in coil coating, general industrial, and maintenance coating specifications to screen for chalking, gloss loss, and cracking.

ASTM D5894 – Cyclic Salt Fog/UV Exposure of Painted Metal

ASTM D5894 combines salt fog corrosion with UV/condensation in cyclic sequences, typically using a fluorescent UV device plus a separate salt spray chamber.

• Typical use: Painted steel and aluminum, marine and coastal applications, infrastructure, automotive underbody parts
• Key features:
  • Alternating cycles of UV/condensation and neutral salt fog
  • Designed for corrosion + UV synergy on coated metals
• Why it matters: Many OEM corrosion test standards reference D5894 because it better represents real-world environments than salt spray alone.

ASTM D4799 – Accelerated Weathering Test Conditions for Plastics

ASTM D4799 is more of a guide to select conditions rather than an equipment operating standard.

• Typical use: Plastics engineers choosing relevant cycles and durations
• Key features:
  • Recommends conditions for different plastics and end uses
  • Often used together with G154, G155, or D4329
• Why it matters: Helps align lab test conditions with expected field performance.

Quick Comparison Table

Standard	Apparatus Type	Lamp / Source	Main Scope	Typical Industries/Use Cases
ASTM G154	Fluorescent UV (QUV)	UVA-340, UVB-313	General UV/weathering practice	Plastics, coatings, elastomers, building products
ASTM G155	Xenon arc (Q-Sun style)	Xenon with filters	Full-spectrum sunlight simulation	Automotive, architectural, aerospace, textiles
ASTM D4329	Fluorescent UV per G154	UVA-340, UVB-313	Plastics-specific practice	Molded parts, housings, outdoor plastics
ASTM D4587	Fluorescent UV + condensation	UVA-340, UVB-313	Paints and organic coatings	Architectural and industrial coatings, coil coating
ASTM D5894	UV (fluorescent) + separate salt fog	UV lamps + salt spray	Painted metal under corrosion + UV	Automotive body/underbody, marine, infrastructure, pipelines
ASTM D4799	Not a device spec – conditions guide	—	Selecting conditions for plastics	Material selection and specification writing

Practical takeaway:
Before investing in a UV resistance test chamber, confirm exactly which ASTM standard code your customers or OEMs cite (G154, G155, D4329, D4587, D5894). Each one points to different equipment requirements and cycles. At Derui, we design our UV and xenon chambers specifically to satisfy these ASTM practices so users in the United States can pass customer audits and regulatory reviews with confidence.

ASTM G154 vs ASTM G155 – Which One Should You Use?

When customers ask us about an ASTM standard for UV resistance test, the real choice usually comes down to ASTM G154 (fluorescent UV / QUV) vs ASTM G155 (xenon arc / Q-SUN). Here’s how I break it down in plain talk.

Fluorescent UV (ASTM G154 / QUV) vs Xenon Arc (ASTM G155)

ASTM G154 – Fluorescent UV (QUV style)
Best when you care more about UV-driven damage than perfect sunlight simulation.

• Pros
  • Lower equipment cost and lower running cost
  • Faster to drive cracking, chalking, gloss loss on many plastics and coatings
  • Simple maintenance and calibration at 340 nm irradiance
  • Great for quality control, production checks, and comparative tests
• Typical use
  • Plastics, powder coatings, industrial paints, sealants, roofing, PVC profiles
  • When your spec says ASTM G154, ASTM D4329, ASTM D4587, or “QUV accelerated weathering”

ASTM G155 – Xenon Arc (Q-Sun style)
Best when you need a realistic sunlight spectrum from UV through visible to IR.

• Pros
  • Closest match to natural daylight behind glass or outdoors
  • Preferred by many automotive, aerospace, and high-end building OEMs
  • Needed for colorfastness to light testing where visible light and heat matter
• Typical use
  • Automotive interior/exterior, architectural coatings, textiles, packaging
  • When your spec says ASTM G155, ISO 4892-2, SAE J2527, or “xenon arc weathering”

If your customer spec calls out one specific standard, follow that. If not, here’s how we guide US customers.

When to Choose UVA-340, UVB-313, or Xenon with Window Glass Filters

In ASTM G154 UV tests, lamp choice matters a lot:

• UVA-340 lamps (most common)
  • Best sunlight UV match from 295–365 nm
  • Ideal for general plastics, coatings, and automotive parts
  • Safer, less “over-accelerated” than UVB for real-world correlation
    → This is what I recommend by default for most UV resistance tests for plastics and coatings.
• UVB-313 lamps
  • Much more aggressive, rich in short-wave UV
  • Good for quick screening or very robust materials
  • Can create damage modes that are harsher than real outdoor exposure
    → Use only if your spec explicitly calls for UVB or you’re doing early-stage R&D screening.

In ASTM G155 xenon arc testing, your main lever is the filter:

• Daylight filters
  • Simulate full outdoor sunlight
  • Used for exterior automotive, outdoor plastics, roofing, siding
• Window glass filters
  • Simulate sunlight through glass (cuts out most short UV)
  • Best for automotive interiors, building interiors, electronics casings, indoor textiles

If your product sits inside a car or behind a window, ask for xenon arc with window glass filters. If it lives outdoors, go with daylight filters or UVA-340 in a QUV.

Simple Decision Flow (Text “Flowchart”)

Use this as a quick mental checklist when choosing an ASTM standard for UV resistance test chamber:

• Is cost and speed your priority?
  • Yes → ASTM G154 + UVA-340 fluorescent UV (QUV)
  • No → Go to next.
• Do you need the best match to natural sunlight and color shift?
  • Yes → ASTM G155 xenon arc with proper filters
  • No → ASTM G154 is usually enough.
• Is your customer an automotive / big OEM in the US?
  • Yes, and spec says xenon → ASTM G155 xenon arc chamber
  • Yes, but spec says QUV → ASTM G154 fluorescent UV chamber
  • No specific spec → Start with ASTM G154 + UVA-340 for most plastics and coatings.

We build our UV test chambers so they can run standard ASTM G154 UV test cycles with UVA-340 or UVB-313 lamps, and our xenon systems are configured to fully support ASTM G155 xenon arc weathering with the right daylight or window glass filters. That way, US customers can match their OEM, ASTM, and ISO 4892 demands without fighting the equipment.

Understanding ASTM UV Test Cycles and Conditions

When U.S. customers ask us about an ASTM standard for UV resistance test, what they really want to know is: “What test cycle should I run, and what does it mean in real life?” Here’s the short, practical version.

Common UV Test Cycles (QUV and Xenon)

Most ASTM G154 (fluorescent UV) and ASTM G155 (xenon arc) methods are built around a few classic cycles. The most common for QUV (fluorescent UV) is:

• 8 hours UV at 60°C (black panel temp, typically BPT/BST)
• 4 hours condensation at 50°C (no UV, dark, 100% RH on the specimen surface)

You’ll also see variations like:

• 4h UV / 4h condensation
• 12h UV only (for some plastics and automotive parts)
• Cycles that add water spray (for G155 and some D5894 procedures)

We set up our chambers to let you:

• Pick standard preset cycles that follow ASTM G154 / G155
• Fine-tune UV time, condensation/spray time, and temperature
• Save custom programs for different materials (plastics, coatings, automotive trim, etc.)

Irradiance Levels and Calibration (340 nm Matters)

For an ASTM-compliant accelerated UV aging test, irradiance control is non-negotiable. The key range most U.S. labs use is:

• 0.68–0.89 W/m²/nm at 340 nm (common for UVA-340 in G154)
• Some protocols go up to ~1.35 or 1.55 W/m²/nm at 340 nm for faster, more severe exposure

What we build into our UV test chambers:

• Closed-loop irradiance control at 340 nm (and 420 nm for xenon)
• Automatic lamp power adjustment to hold the set level
• On-screen monitoring of W/m²/nm, BPT/BST, and chamber temperature

Calibration requirements (if you want to pass OEM or ISO 17025 audits):

• Use a traceable irradiance sensor (NIST-traceable in the U.S.)
• Verify irradiance regularly (often every 250–500 hours or per lab SOP)
• Document:
  • Set point (e.g., 0.89 W/m²/nm @ 340 nm)
  • Actual measured value
  • Sensor serial number and calibration certificate

Converting Test Hours to “Real World Years”

Every U.S. customer asks: “How many hours in the QUV equals one year in Florida?” There is no perfect one-size answer, but here are realistic rules of thumb that many industries use:

• Outdoor durable plastics (with UV stabilizers):
  • Rough rule: 1,000 hours in ASTM G154 UVA-340 ≈ 1 year of Florida exposure
• Architectural and automotive coatings:
  • 2,000–3,000 hours UV often used to represent 3–5 years of outdoor service
• Unstabilized plastics or low-cost materials:
  • Damage can appear in just 250–500 hours, even if real-life failure takes longer

What we recommend:

• Treat accelerated UV testing as a ranking and screening tool, not an exact calendar converter.
• Build a correlation by:
  • Running the same material in Florida or Arizona exposure
  • Running ASTM G154 or G155 in the lab
  • Matching specific failure points (color change, gloss loss, cracking, etc.) between field and lab

With the right ASTM UV resistance test cycle, proper irradiance control at 340 nm, and tight calibration, you get data that U.S. OEMs trust—and a clear, defendable story when you claim “5-year UV durability.”

Equipment Requirements to Truly Meet ASTM Standards

If you want your ASTM standard for UV resistance test results to actually count in the U.S. (OEM audits, lab approvals, disputes, etc.), the chamber has to do more than just “shine UV.” It needs to match ASTM G154 and ASTM G155 in hardware, control, and calibration.

Mandatory Features for ASTM G154 UV Test (Fluorescent QUV)

For ASTM G154 UV test (fluorescent UV, QUV type), I always make sure the chamber includes at least:

Requirement	What ASTM G154 Expects
Lamp Type	UVA-340 / UVB-313 fluorescent UV lamps
Irradiance Control	Closed-loop control at 340 nm (e.g., 0.68–1.55 W/m²/nm)
Black Panel Temperature (BPT)	Sensor and control, typically 50–75°C
Condensation Capability	Condensation cycle with heated water pan
Cycle Programming	UV + condensation cycles (e.g., 8h/4h)
Specimen Mounting	Rigid, repeatable panel holders
Safety & Monitoring	Over-temp protection, lamp hour tracking

We design our G154-capable chambers to hit these points out of the box so you aren’t arguing with auditors later.

Mandatory Features for ASTM G155 Xenon Arc Testing

For ASTM G155 xenon arc testing (Q-Sun style), the bar is even higher:

Requirement	What ASTM G155 Expects
Lamp Type	Water- or air‑cooled xenon arc lamp
Filter Systems	Window glass / daylight filters to shape spectrum
Irradiance Control	Closed-loop at 340 nm or 420 nm
Black Standard/Panel Temp (BST/BPT)	Dedicated sensor and control
Chamber Air Temperature	Controlled to spec
Relative Humidity Control	Active humidity control (not just “wet air”)
Spray / Water Spray	Programmable spray as required by method

Our xenon chambers are built to match ASTM G155 + ISO 4892 so U.S. labs and OEMs can use a single platform for global programs.

Common Non-Compliances in Cheap UV Chambers

This is where many low-cost imports fail U.S. customers:

• No real irradiance control
  • Only “lamp hours” or intensity dials, no W/m²/nm feedback.
• Wrong or generic lamps
  • Non-UVA-340/UVB-313 lamps claimed as “ASTM G154,” or xenon without proper filters.
• No BST/BPT sensor
  • Only “chamber temperature” shown, which does not satisfy G154/G155.
• No condensation / poor humidity control
  • Basic heating, no controlled condensation or RH loop.
• Limited cycle programming
  • Can’t match the exact cycles specified in the test standard.
• No calibration ports or documentation
  • Nothing to support ISO 17025 or OEM audit requirements.

These shortcuts are exactly why some U.S. labs have to re-test in compliant equipment.

ISO 17025 Calibration and Traceability

For U.S. customers, especially automotive, construction, and coatings, ISO 17025 traceability is a must:

• Irradiance calibration
  • Use reference sensors traceable to NIST; verify at 340 nm (and 420 nm for xenon).
• Temperature sensors (BST/BPT, chamber air)
  • Regular calibration with traceable thermometers.
• Humidity sensors (for G155)
  • Documented, traceable RH calibration.
• Calibration records & reports
  • Clear calibration certificates, serial numbers, and adjustment logs.

We build our ASTM UV resistance test chambers with front-access calibration ports, stable control loops, and full documentation so your lab can maintain ISO 17025-compliant calibration routines without fighting the hardware.

How to Interpret and Report ASTM UV Test Results

When we run an ASTM standard for UV resistance test in our chambers, the way you read and report the data is just as important as the exposure itself. Here’s how we help U.S. customers make sense of the results and keep reports fully ASTM‑compliant.

Key performance indicators (what to measure)

In ASTM G154, ASTM G155, D4329, D4587, and related UV resistance tests, most customers track:

• Color change (ΔE)
  • Measured with a spectrophotometer before and after exposure
  • ΔE 1–2: often “slight” change; ΔE > 3–5: usually visible in consumer products
  • Used heavily in plastics, automotive interiors, coil coatings, building materials
• Gloss loss
  • Measured at 20°, 60°, or 85° depending on coating type
  • Report % gloss retained or % gloss loss
  • Critical for powder coating, automotive clearcoat, architectural finishes
• Chalking
  • Surface turns powdery or dusty due to binder breakdown
  • Rated visually with standard reference panels (ASTM chalk rating scales)
  • Common in coil coating, outdoor paints, siding
• Cracking, blistering, flaking, and erosion
  • Recorded using visual rating scales and close‑up photos
  • Note: location, size, density, and time to first defect
  • Important for metal panels, outdoor plastics, UV‑cured coatings
• Tensile strength and mechanical retention
  • For plastics, rubber, and films:
    • Tensile strength
    • Elongation at break
    • Impact strength, flexural modulus (if required)
  • Report % property retention compared to unexposed controls

Minimum reporting elements ASTM expects

To claim your test followed an ASTM UV standard (like G154 or G155), your report needs specific details. We design our UV chambers and test templates so this information is easy to capture:

• Standard and revision used
  • Example: “Exposure per ASTM G154‑25, Cycle 1”
• Exposure cycle
  • UV/condensation or UV/spray times
  • Black panel temperature, chamber temperature, relative humidity
• Light source and filters
  • Fluorescent UV type: UVA‑340, UVB‑313, etc.
  • Xenon arc: filter system used (e.g., daylight, window glass)
  • Irradiance setpoint (e.g., 0.89 W/m²/nm at 340 nm)
• Test duration
  • Hours of exposure, number of cycles, and sampling intervals (e.g., 500, 1000, 2000 hours)
• Specimen details
  • Material name, color, thickness
  • Surface preparation, coating system, cure conditions
• Evaluation methods
  • Which standards and instruments were used for:
    • Color (ΔE)
    • Gloss
    • Chalking, cracking, blistering
    • Mechanical tests (tensile, impact, etc.)
• Results and acceptance criteria
  • Data tables showing:
    • ΔE vs hours
    • Gloss retention vs hours
    • Tensile/elongation retention vs hours
  • Pass/fail criteria per your OEM spec, internal spec, or customer requirement
• Calibration and traceability notes
  • Confirmation that irradiance calibration and temperature sensors are traceable (ISO 17025 or equivalent)
  • Chamber ID, lamp type, calibration date

How we help you report clearly

As a manufacturer of ASTM standard for UV resistance test chambers, we build features that make reporting easier for U.S. labs and production sites:

• Built‑in logging of irradiance, temperature, and cycle history
• Exportable data for color, gloss, and mechanical results
• Templates aligned with ASTM G154, ASTM G155, D4329, D4587, and D5894 requirements

This way, when an automotive OEM, building materials buyer, or third‑party lab audits your data, your UV resistance test report is complete, traceable, and clearly linked to the correct ASTM standard.

ASTM vs ISO UV Standards – Quick Cross-Reference

When you’re buying an ASTM standard for UV resistance test chamber in the U.S., you’ll usually see both ASTM and ISO standards on the spec sheet. Here’s how they line up and what actually matters for your lab or production floor.

ASTM G154 vs ISO 4892-3 (Fluorescent UV)

• ASTM G154 is the main fluorescent UV (QUV) accelerated weathering practice in the U.S.
• ISO 4892-3 is the closest international equivalent.
• Both cover:
  • Fluorescent UV lamps (UVA-340, UVB-313, etc.)
  • UV exposure + condensation cycles
  • Settings for irradiance control at 340 nm, temperature, and test duration

If your customers are U.S.–based or follow North American specs, they’ll almost always call out ASTM G154 even if ISO 4892-3 is technically acceptable.

ASTM G155 vs ISO 4892-1 / 4892-2 (Xenon Arc)

• ASTM G155 is the standard for xenon arc weathering chamber tests (Q-Sun type).
• It lines up with:
  • ISO 4892-1 (general guidance)
  • ISO 4892-2 (xenon arc specifics)
• All of them deal with:
  • Xenon arc lamps with different filter sets (like Window Glass filters)
  • Control of irradiance, black standard temperature, and humidity
  • Test setups for colorfastness to light, coatings durability, and plastics UV resistance

For U.S. automotive, construction, and coil coating customers, ASTM G155 is usually named directly in OEM specs, even when ISO is allowed.

Why Global OEMs Accept ISO but Still Specify ASTM

Most global OEMs (auto, building products, plastics) will say something like “ASTM G154 / ISO 4892-3 or equivalent.” In practice, U.S. buyers still lean on ASTM because:

• ASTM is the default language in U.S. material and coating specs.
• Many internal qualification procedures and historical data are built around ASTM G154 and G155.
• U.S. labs, Tier-1 suppliers, and auditors are more familiar with ASTM-based test reports.

That’s why our UV resistance test chambers are designed to fully comply with ASTM G154 and G155 first, while also matching ISO 4892 requirements. This way, you can:

• Run tests for ASTM UV resistance and ISO 4892 in the same chamber
• Satisfy U.S. OEMs, European customers, and global brands with one piece of equipment
• Keep your test method, cycles, and reports aligned with what U.S. auditors expect

Choosing an ASTM Standard for UV Resistance Test Chamber in 2025

If you need an ASTM standard for UV resistance test chamber that will actually pass audits in the U.S. market, the big difference today is simple: real compliance vs. “ASTM-like” marketing.

Red flags in low‑cost UV test equipment

Watch out for these common issues:

• No true irradiance control at 340 nm
  – Only “hours of exposure” shown, no W/m²/nm value
  – Cannot hold 0.68–1.55 W/m²/nm @ 340 nm like ASTM G154 / G155 require
• Wrong or uncertified lamps
  – Generic “UV lamps” instead of UVA‑340 or UVB‑313 lamps for QUV accelerated weathering
  – Xenon chambers without proper window glass or daylight filters
• Poor temperature and humidity control
  – No black panel temperature (BPT/BST) sensor
  – Big swings in chamber temperature and RH, impossible to match ASTM cycles
• Limited cycle programming
  – Can’t run standard UV / condensation or UV / water spray cycles used in ASTM G154, ASTM D4329, ASTM D4587
  – No automatic alternating steps (8h UV + 4h condensation, etc.)
• No traceable calibration
  – No ISO 17025 calibration support
  – No calibration port or reference radiometer option
• Weak documentation
  – Only a simple “user manual,” no IQ/OQ, no chamber performance report, nothing you can show to an OEM or auditor

If you see any of the above, that chamber is not ready for serious UV resistance testing for U.S. automotive, building, or coatings customers.

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What our Derui ASTM UV test chambers include as standard

We build our QUV accelerated weathering and xenon arc weathering chambers specifically around ASTM G154, ASTM G155, and related methods like ASTM D4329, ASTM D4587, and ASTM D5894.

Key standard features we include to stay ahead of ASTM:

• Precise irradiance control
  • Closed‑loop irradiance control at 340 nm (and 313 nm when needed)
  • Adjustable levels to match typical 0.68–1.55 W/m²/nm @ 340 nm settings
  • Stable output for long‑term accelerated UV aging tests
• Correct lamp and filter configurations
  • UVA‑340 and UVB‑313 fluorescent UV lamps for ASTM G154 & D4329
  • Xenon arc systems with ISO 4892‑2 / ASTM G155 style window glass filters
  • Lamp combinations aligned with OEM and ASTM requirements for plastics, coatings, and automotive exteriors
• Tight temperature and humidity control
  • Black standard/black panel temperature sensors (BST/BPT)
  • Closed‑loop control for UV, condensation, and spray phases
  • Reliable UV‑condensation and UV‑spray cycles
• Flexible, ASTM‑ready cycle programming
  • Pre‑loaded programs for common ASTM G154, ASTM G155, ASTM D4329, ASTM D4587 cycles
  • Custom cycle creation for OEM‑specific specs
  • Data logging for temperature, humidity, irradiance, and time
• Calibration and traceability
  • Design ready for ISO 17025 traceable calibration
  • Support for radiometer calibration at 340 nm or 420 nm
  • Calibration reports that U.S. OEMs and third‑party labs expect to see

These are the features that make a chamber truly ASTM G154 UV test or ASTM G155 xenon arc testing compliant, not just “similar to ASTM.”

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Real‑world case examples with Derui UV resistance test chambers

We’ve seen what U.S. customers actually get measured on during audits. A few quick snapshots:

• Automotive Tier‑1 supplier (exterior plastics & coatings)
  • Needed to run ASTM G155 xenon arc tests for bumper and trim materials, plus colorfastness to light.
  • OEM audit checked: irradiance control, black panel temperature, test records, and calibration certificates.
  • Our chamber and documentation passed their audit without any corrective actions required.
• Coil coating manufacturer (metal roofing and siding)
  • Running ASTM G154 UV test to validate gloss retention and chalking on painted coils.
  • Required stable UV‑condensation cycles and support for ASTM D5894 cyclic salt fog / UV programs.
  • Auditor compared our logged data vs. ASTM cycle requirements and accepted the system as compliant.
• Polymer producer (engineering plastics for outdoor use)
  • Needed a flexible system to run both UV resistance test for plastics (ASTM D4329) and coatings (ASTM D4587).
  • We supplied a QUV‑type chamber with both UVA‑340 and UVB‑313 lamp options, plus pre‑set programs.
  • They passed their OEM qualification because the chamber settings and test reports matched the specified ASTM methods.

If you’re serving U.S. automotive, building products, coatings, or polymer markets, your UV chamber compliance will be checked. We design our Derui chambers so you’re not arguing with auditors about whether your equipment really meets ASTM UV resistance test standards—you can just show them.

FAQs – ASTM UV Testing (People Also Ask)

Most widely used ASTM UV test for plastics

For plastics, the most widely used ASTM UV test in the U.S. is:

Application	Common ASTM UV Test	Notes
General plastic parts	ASTM D4329 + ASTM G154	Fluorescent UV, QUV style testing
Co-extruded / outdoor use	ASTM D4329, sometimes ASTM G155	When closer sunlight match is needed

When customers ask us what to follow for plastic parts durability, we usually start with ASTM D4329 with UVA-340 lamps, because it’s clear, widely recognized, and easy to compare across suppliers.

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How many QUV hours equal one Florida year?

There’s no perfect conversion, but for accelerated UV aging tests, most U.S. OEMs use rough rules of thumb:

Material Type	Rough QUV Hours ≈ 1 Florida Year*
Exterior plastics	1,000–1,500 h (UVA-340, typical cycle)
Coatings	750–1,000 h
Automotive parts	Based on OEM spec, often 1,000+ h

*Actual correlation depends on resin, pigment, stabilizers, and test cycle. We always tell customers to validate against outdoor exposure before locking in a number.

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Can I use the same chamber for ASTM G154 and G155?

No.

• ASTM G154 = Fluorescent UV (QUV-type)
• ASTM G155 = Xenon arc (Q-Sun type)

They use different light sources, filters, and hardware.
We build separate chambers for G154 and G155 because trying to “do both in one” usually means:

• Poor spectral match
• Harder calibration
• Failing customer audits

If you need both methods, most U.S. labs run one QUV-style unit (G154/D4329) and one xenon unit (G155).

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Difference between ASTM D4329 and ASTM G154

Here’s the quick breakdown:

Item	ASTM D4329	ASTM G154
Type	Material-specific	General practice
Main focus	Plastics	Any nonmetal / organic material
What it gives you	Detailed conditions for plastics	Framework for fluorescent UV tests
How we use it in the U.S.	As the primary plastic spec	As the base practice + reference

In our chambers, we design the control system so you can easily select preset D4329 cycles, which are fully built on G154 operating rules.

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Do I need water spray or condensation?

It depends on how your product is used outdoors:

Environment / Use Case	Recommended Feature
Roofing, siding, exterior trim	Condensation at night
Automotive exterior, coil coating	Spray or spray + condensation
Indoor / behind glass products	Usually UV only, no spray/condensation
Marine / coastal metal structures	Spray + corrosion cycles

Quick guidance we give U.S. customers on selecting the right Environmental Test Chamber:

If your product sees dew and humidity, choose a chamber with condensation.
If it sees rain, splash, or road spray, choose an Environmental Test Chamber with water spray.
Many OEM specs combine UV + condensation + spray in one cycle for tougher validation.
Our Environmental Test Chambers for UV resistance can be configured with UV-only, UV + condensation, or UV + spray, ensuring you can match your customer’s ASTM method without compromise.UV + condensation, or UV + spray so you can match your customer’s ASTM method without compromise.