A sealant can look perfect on day one and still turn yellow, go hard, or crack after a few months in the sun. Buy the wrong test equipment
and you find out too late, after the product is already on the job site.
Real-world performance feedback also matters when selecting UV weathering equipment. A customer in Thailand using LIB Industry's UV-SI-260 UV Weathering Test Chamber for plastic testing shared: "The UV chamber still works well. From my side, almost everything is OK. The only issue is the clip lock, which is a little difficult to use with thicker specimens." This feedback shows the chamber's stable operation while also highlighting a practical sample fixture consideration for different material thicknesses.
This article explains how UV weathering equipment and temperature humidity equipment differ for ASTM C510, ASTM C793, and ASTM C661, and how to pick the right type and size for your lab.
What Is the Difference Between UV Weathering and Temperature Humidity Test Equipment?
Key Differences at a Glance
The three standards test different things, so they need different equipment. ASTM C510 checks color change after about 100 hours of UV exposure. ASTM C793 checks hardness, flexibility, and appearance after about 250 hours at 0.51 W/m² UV irradiance. ASTM C661 measures indentation hardness at 23°C, so it needs steady temperature more than light.
| Item |
|
|
|---|---|---|
| Best for | ASTM C510, ASTM C793 | ASTM C661 |
| Main stress | UV light, heat, condensation, water spray | Steady temperature and humidity |
| Key values | 0.15 to 5 W/m² at 340 nm or 313 nm, black panel 35 to 80°C, 95% RH or higher | -70 to +150°C, 20 to 98% RH, ±0.5°C, ±2.5% RH |
| Typical test | 100 hours for C510, 250 hours for C793 | Hold at 23°C for hardness reading |
| What you check | Color, hardness, flexibility | Indentation hardness |
Why LIB Industry Is a Reliable Supplier
LIB Industry builds both types of equipment. The TH Series offers more than 98 models from 100 L to 1000 L, covering -70 to +150°C and 20 to 98% RH. The UV-SI-260 carries 8 UVA-340 lamps rated 40 W each, holds 52 specimens of 75 by 150 mm, and its lamps last up to 5000 hours. Both types use a PID touchscreen with 120 programs of 100 steps each and run below 65 dB(A). LIB Industry supplies building material makers, automotive suppliers, electronics factories, and packaging labs, including [add partner names].
UV Weathering Standards for the Packaging Industry
The UV-SI-260 meets these common packaging standards.
| Standard | Applicable to |
|---|---|
| ASTM G154 | Plastics and coated materials under fluorescent UV and condensation |
| ASTM G151 | General rules for lab light exposure of packaging materials |
| ISO 4892-3 | Plastic bottles, caps, and containers |
| ASTM D4329 | Plastic films and rigid plastic packaging |
| ASTM D4587 | Paints, inks, and coatings on packaging |
Measurement Canada Praises LIB Industry Temperature Humidity Equipment
Measurement Canada chose LIB Industry TH Series Temperature Humidity equipment for product performance testing. They were satisfied with its stable control,
complete functions, and fast delivery. A typical hold test on this equipment runs like this:
Set the touchscreen to 23°C and choose the humidity value your method needs, anywhere from 20 to 98% RH.
Load samples evenly on the shelves, away from the walls and sensors.
Start the program. PT100 Class A sensors with 0.001°C resolution keep the equipment within ±0.5°C and ±2.5% RH.
Watch live data on the screen, or through the Ethernet and USB ports.
Export the report and record your hardness readings.
Here is why buyers stay happy:
High safety: Leakage current protection, grounding, phase monitoring, over temperature shutdown, water shortage protection, and refrigerant high pressure protection guard both samples and operators. The equipment follows CE and IEC requirements.
Accurate results: Every sample sees the same conditions, so results repeat from run to run.
Free customization: Double doors, cable hole size and quantity, extra shelves, and ramp rates up to 20°C/min can all be tailored.
Worry free support: A 3 year warranty and lifetime service back every unit. Our engineers are patient and skilled, and on-site training is available.
Built to last: The SUS304 stainless steel interior resists corrosion in high humidity.
Good value: You get a full feature set and quiet operation below 65 dB(A) at a fair price
Popular Temperature humidity and UV Weathering test chambers
Compact Environmental Test Chamber, Small Temperature Humidity Testing Solution
Reliable Climate Test Chamber, Precision Temperature Humidity Testing Equipment
Large Volume Environmental Chamber, Walk-In Climate Testing Solution
Rapid Temperature Cycling Chamber, High Speed Thermal Shock Testing Solution
Reach-in vs Walk-in Temperature Humidity Test Chamber: How to Choose
Both types control temperature and humidity. The real difference is sample size.
|
|
|
|
|---|---|---|
| Item | Reach-in Temperature Humidity Test Chamber | Walk-in Temperature Humidity Test Chamber |
 |
 |
|
| Volume | 100 L to 1000 L, models TH-100 to TH-1000 | Above 1000 L, built to order |
| Best samples | Sealant blocks, durometer specimens, small parts | Large joint mockups, full panels, pallets |
| Temperature | -70 to +150°C | Set to your project |
| Humidity | 20 to 98% RH | Set to your project |
| Related standards | ASTM C661 at 23°C, IEC 60068, UL 1642 | IEC 61215 for solar modules, VW 80000 for vehicle parts |
| Heating and cooling | 3°C/min up, 1°C/min down | Set to your project |
The UV side does not change with equipment size. Use 100 hours for ASTM C510 and 0.51 W/m² for 250 hours for ASTM C793. General UVA-340 work usually runs at 0.3 to 1.0 W/m² at 340 nm.
If your samples are sealant blocks or small joints, a reach-in model such as the TH-100 with 100 L is enough. It costs less, ramps faster, and uses less power. Choose walk-in only when you must test whole assemblies or many large samples at once.
FAQs on the Reach-in Temperature Humidity Test Chamber
Q1：Which model fits ASTM C661?
Any TH model reaches 23°C easily. The TH-100 with 100 L is enough for most sealant hardness specimens.
Q2: How accurate is the equipment?
Temperature fluctuation is ±0.5°C and humidity deviation is ±2.5% RH.
Q3: Can I customize it for free?
Yes. Cable holes, shelves, doors, and ramp rates can be tailored at no extra design charge.
Q4: What warranty and service do I get?
You get a 3 year warranty, lifetime service, and on-site training on request.
Q5: How is the equipment shipped?
It is packed for safe sea or air freight, and your sales engineer confirms the delivery time for your model and destination in the quote.
Need Help Choosing the Right Sealant Test Chamber?
Choosing the right environmental test chamber depends on your required test standard, sealant type, sample size, exposure condition, and testing purpose. LIB Industry provides environmental testing solutions for sealants, plastics, coatings, and building materials, including a UV Weathering Test Chamber for UV aging evaluation according to ASTM G154, ASTM C510, and ASTM C793, aTemperature Humidity Test Chamberfor ASTM C661 hardness testing and climate conditioning, as well as customized environmental test equipment for different material durability evaluations.
Share your required test standard, sealant material, sample dimensions, exposure duration, environmental conditions, and any special fixture requirements. Based on these factors, the LIB Industry team can help identify the appropriate testing solution for sealants, adhesives, coatings, plastics, and other products.
References
LIB Industry Technical Team (info@libtestchamber.com) – Technical information, testing methods, product specifications, and application guidance for UV weathering testing, temperature humidity testing, sealant durability evaluation, material aging testing, and environmental reliability testing.
