Fluorescence UV Aging Test Chamber

Fluorescence UV Aging Test Chamber
1、 Product Description:
Many polymer materials are often damaged by natural environmental factors from the Earth's surface and atmospheric space during outdoor use, which affects their service life. In order to accurately evaluate its outdoor service life, using environmental testing equipment to simulate various external natural climate conditions and studying the weather resistance of various products in the laboratory has become a widely used and effective means.
The XD-21-856 fluorescent ultraviolet accelerated aging test chamber uses a fluorescent ultraviolet lamp as the light source, and appropriately controls the temperature and humidity to periodically produce condensation on the sample, in order to comprehensively obtain the results of the damage effects of sunlight, humidity, and temperature on polymer materials (material aging includes fading, loss of light, strength reduction, cracking, peeling, powdering, and oxidation, etc.).
Usually, UV lamps can be divided into two types: UVA and UVB.
Several different types of ultraviolet lamps can be applied in different fields, as listed below:
① UVA-340 tube: UVA-340 tube can simulate short wave ultraviolet light in sunlight very well, that is, the wavelength range from 365 nanometers to 295 nanometers, which is the cutoff wavelength of sunlight.
② UVA-351 tube: UVA-351 tube can simulate the ultraviolet part of sunlight passing through window glass Mainly used to simulate the repair caused by sunlight passing through window glass indoors, it is very useful for testing indoor materials.
③ UVB-313 tube: The short wave ultraviolet light emitted by the UVB-313 tube is stronger than the solar ultraviolet light that usually shines on the Earth's surface, which can accelerate the aging of materials to the greatest extent possible. However, the lamp may cause impractical damage to certain materials. UVB-313 lamps are mainly used for quality control and research and development, or for testing materials with extremely strong weather resistance.
④ QFS-40 tube: also known as FS-40 or F40UVB, this is the original QUV tube. FS-40 lamps are still used in some traditional automotive testing methods.
The fluorescence of ultraviolet lamps can reproduce the influence of sunlight, while condensation and water spray systems can reproduce the influence of rainwater and dew. Throughout the entire testing cycle, the irradiation energy and temperature are controllable. A typical testing cycle typically involves exposure to ultraviolet light at high temperatures and a dark, humid condensation cycle with a relative humidity of 100%; Typical applications include paint and coatings, automotive industry, plastic products, wood products, adhesives, etc.

2、 Compliant with standards:
ISO 11507 "Artificial aging exposure of paints and clear coatings to fluorescent ultraviolet radiation and water"
ISO EN 4892-3 "Plastics Methods of exposure to laboratory light sources Part 3: UV Fluorescent Lamps
GB/T 14522 "Accelerated Test Method for Artificial Climate for Plastic, Coating, and Rubber Materials Used in Mechanical Industry Products"
GB/T 23983 "Determination of Yellowing Resistance of Wood Coatings"
GB/T 23987 "Artificial weathering exposure of paints and clear coatings to fluorescent ultraviolet radiation and water"
GB/T16422.3 "Plastic laboratory light source test exposure methods: Part 3: Fluorescent ultraviolet lamps"
ASTM D4587 "Fluorescent UV Condensation Exposure Test for Paint and Related Coatings"
ASTM D5894 "Painted Metals"
ASTM G154 "Fluorescent UV/Water Exposure Standard for Non Metallic Materials"
ASTM D 4329 "Fluorescent UV/Water Exposure Standard for Plastics",
ASTM D 4798 "Aging Standard for Asphalt Roofing Materials"
SAE J 2020 "Accelerated Exposure Standard for Automotive Exterior Materials" products, adhesives, etc.
3、 Performance characteristics:
◆ Original imported UVA or UVB lamps ensure comparability of test data
XD-21-856 all use ultraviolet lamps produced by Q-Lab in the United States as experimental light sources. Compared to other types of lamps (including xenon arc lamps), fluorescent ultraviolet lamps are more stable. Spectral power distribution (SPD) does not change with lamp aging, even after up to 6000 hours of use. This will result in more reproducible test results, while reducing the need for lamp replacement and lowering operating costs. In addition, the lamps produced by Q-Lab are specially designed according to their own unique specifications based on Q-Lab's over 40 years of experience and fluorescent UV technology, and have undergone the strictest quality control testing in the industry.
◆ Fully automatic control of irradiation energy (using closed-loop control system, precise and stable energy value), comparable to the highest international level in the same industry
The biggest difference between XD-21-856 and other domestic brands is that the energy during the entire testing process is controllable and automatically adjusted. As is well known, the energy during the experimental process is the most important factor causing the aging of polymer materials. In order to ensure the reproducibility and comparability of experimental results, ultraviolet energy is a very important technical indicator. We use a principle similar to the sun eye to automatically monitor the energy value during the entire testing process. When the energy value set for the test cannot be reached due to the aging of the lamp tube, the system can automatically detect and immediately replenish it.
◆ Irradiance can be automatically calibrated
Like any lamp tube, the energy of the XD-21-856 UV lamp tube also decreases with increasing usage time. The XD-21-856 control system compensates for the weakened light energy by enhancing the light energy. However, as the lamp is used for a longer period of time, it can continue to weaken. At a relatively higher set point, XD-21-856 will not be able to maintain the corresponding irradiance, and the system will prompt a fault of "large irradiance error" and shut down. At this point, the user needs to calibrate the XD-21-856 radiometer.
XD-21-856 is calibrated using our company's self-developed irradiance calibrator; Users can also calibrate multiple XD-21-856 with one calibrator. It specializes in measuring fluorescent ultraviolet lamps and can be used to calibrate both UVA and UVB lamps. For UVB lamps, the irradiance calibrator has been calibrated at 310nm in units of W/m2/nm; For UVA lamps, the irradiance calibrator has been calibrated at 340nm in units of W/m2/nm.
On the calibration interface of XD-21-856, users only need to input the values read from the calibrator and click confirm, and XD-21-856 will automatically complete the entire calibration process.
◆ Condensation function (simulating humid condensation environment)
In many outdoor environments, materials can be kept moist for up to 12 hours per day. Research has shown that the main factor causing outdoor humidity is dew, not rainwater. XD-21-856 simulates outdoor moisture erosion through its unique condensation function. In the condensation cycle during the experiment, the water in the reservoir at the bottom of the testing chamber is heated to generate hot steam, which fills the entire testing chamber. The hot steam maintains the relative humidity in the testing chamber at 100% and maintains a relatively high temperature. The sample is fixed on the side wall of the testing chamber, so that the testing surface of the sample is exposed to the ambient air inside the testing chamber. The outward side of the sample exposed to the natural environment has a cooling effect, resulting in a temperature difference between the inner and outer surfaces of the sample. The occurrence of this temperature difference causes the sample to always have liquid water generated by condensation on its testing surface throughout the entire condensation cycle.
Due to outdoor exposure to moisture for up to ten hours a day, a typical condensation cycle typically lasts for several hours. XD-21-856 provides two wet simulation methods. The most commonly used method is condensation, which is the best way to simulate outdoor moisture erosion. At the same time, XD-21-856 also provides a wet method of water spraying. All XD-21-856 can operate both condensation and water spray cycles.
Spray function (simulating humid condensation environment)
For certain applications, water spray can better simulate the environmental conditions of final use. Water spraying is very effective in simulating thermal shock or mechanical erosion caused by temperature fluctuations and rainwater erosion. Under certain practical application conditions, such as sunlight, when the accumulated heat rapidly dissipates due to sudden showers, the temperature of the material will undergo a sharp change, resulting in thermal shock, which is a test for many materials. The water spray of XD-21-856 can simulate thermal shock and/or stress corrosion.
The XD-21-856 spray system consists of 12 nozzles (6 on each side), connecting pipes, control and drainage parts. The nozzle is installed between the UV lamps, and during the cycle, when the lamps are turned off, water will be sprayed onto the sample. The sprinkler system can run for a few minutes and then shut down. This short-term water spray can quickly cool the sample and create conditions for thermal shock.
High precision Pt 100 blackboard temperature sensor; Automatic temperature control and calibration capability
Temperature control is crucial throughout the entire experimental process as it affects the aging rate. B-SUN uses a blackboard temperature sensor to accurately monitor the exposure temperature of samples inside the box. Meanwhile, temperature control is also crucial for the reproducibility of testing.
Black Board Temperature is the temperature measured by a rod-shaped platinum thermocouple on the surface of a metal test plate coated with a black coating (capable of absorbing at least 90% to 95% of radiation within 2500nm). It is exposed to the same conditions as the test sample and is used to control the temperature obtained on the surface of the test sample exposed to sunlight. XD-21-856 can arbitrarily set the blackboard temperature required for the test and automatically control it throughout the entire test process. The blackboard thermometer can also be calibrated regularly through the calibration interface of XD-21-856.
◆ Meets multiple domestic and international testing standards, with multiple testing procedures set arbitrarily
Users may need to conduct different tests according to different standards or testing methods. XD-21-856 provides a very user-friendly feature: users can edit any test program, which consists of different segments (up to 10 segments can be set), and each segment can be set with different working conditions (including irradiation, spraying, condensation, and segment termination) and corresponding test parameters. XD-21-856 allows users to set up to six different test procedures and permanently save them. Simply call up the program during each experiment to start the test.
◆ Touch screen menu operation control, friendly and convenient interface, can view any parameter in the experiment at any time
All control and display of XD-21-856 are completed by a high-definition color touch screen, and the menu based operation is very convenient for users to use and maintain XD-21-856. During the test operation, all test parameters can be displayed in real time on the screen.
Real time data collection and storage, automatic generation of experimental data in EXCEL format for saving, and can be exported through a USB drive, truly achieving unmanned operation
The XD-21-856 has a USB interface on the back, through which the XD-21-856 can export all operating parameters of the user's requested time period at any time, making it convenient for users to conduct statistics and observations on the machine's operation, truly achieving unmanned operation.