One of the significant factor to snail trails is the composition of EVA.
EVA with suitable substance could resist snail trails.
Products of some EVA suppliers have been proved to work well.
Backsheet is not the key contributor to snail trails. Snail trails will always appear with or without backsheet. Narrow cracks, or microcracks, are also a key factor. They prevent the moisture from evaporating out of the module, hence effectively preventing the humidity inside PV module from dropping. It is easier to create snail trails under such condition. Compared with regular Damp Heat test, UV+DH test condition plus specially designed evaluation samples could generate faster results. It is proven that it will shorten the testing time by 50%. Also, straight line cracks caused by laser cut is effective and helpful for quantitative evaluation of snail trails.With UV+DH test conditions, the probability of snail trail appearance is guaranteed.It can accelerate the process of PV module and EVA R&D. Most white belt zones, which were found along the straight cut lines, converted into snail trails.
THR Series — Temperature Humidity Room
| Parameter | Specification |
|---|---|
| Model | THR-volume — low-temperature options A~F |
| Internal Dimensions | Factory direct — internal dimensions customizable |
| Temperature Range | Low: (A) 25 °C / (B) 0 °C / (C) −20 °C / (D) −40 °C / (E) −60 °C / (F) −70 °C High: 80 °C (80 °C ~ 150 °C optional) |
| Humidity Range | 20% ~ 98% R.H. (10–98% / 5–98% available as special optional condition with dehumidifier) |
| Indication Resolution / Distribution Uniformity | 0.1 °C; 0.1% R.H. / ±2.5 °C; ±3.5% R.H. |
| Control Accuracy | ±0.5 °C; ±2.5% R.H. |
| Temperature Rising / Falling Velocity | Rising approx. 0.1 ~ 3.0 °C/min Falling approx. 0.3 ~ 1.0 °C/min (Faster temperature change rate is optional) |
| Cooling System | Water-cooled or air-cooled |
| Compressor | French Tecumseh brand; Germany Bizer brand |
| Protection Devices | Fuse-free switch; compressor overload protection; high/low coolant voltage protection; over-humidity & over-temperature protection; fuses; fault warning system; water short-storage warning protection |
| Optional Accessories | Slope for cart; recorder; water purifier; dehumidifier |
| Power | AC 380 V (±10%), 50/60 Hz, 3-phase 5-wire |
Custom chamber size available on request. Send us your DUT spec and required W×H×D — our team will recommend a configuration and quote within 24 hours.
A walk-in chamber for large parts and machinery. Temperature and humidity combined in one room — sized to your DUT and lab layout.
The THR Series (Temperature Humidity Room) is a walk-in chamber with an integrated pipe and duct design, an all-in-one touch screen control panel, and a programmable logic controller. Room dimensions can be tailored to your product and lab layout.
Used across electronics, automotive, LED, PCB, and home appliance industries for whole-product reliability testing.
In practice: Inner dimensions are built to match your product and lab layout — no need to disassemble large equipment before testing.
In practice: Select the low-temperature grade that matches your test standard. High-temperature up to 150 °C available as an option.
In practice: Move fully assembled products inside on a cart. No size limits from sliding trays or fixed shelves.
In practice: Dedicated protection for power, motor, compressor, heater, and water supply — reducing risk to both sample and operator.
Control, monitoring, and safety features included with every walk-in chamber.
Supported test standards for temperature and humidity reliability testing.
Seven independent protection layers — protecting your sample, your operator, and the system.
From factory to your lab — our engineers handle the full installation and commissioning process.
Walk-in chambers are large, site-dependent systems. Our engineers work with your team to plan the layout, connect utilities, and commission the chamber on-site.
High-resolution photos and dimensional drawings available on request.
Suitable for whole-product temperature and humidity testing across multiple industries.
