Long-term Effects of Ultraviolet Radiation on Materials Studied with UV Aging Test Chambers

The UV Aging Test Chamber adopts fluorescent ultraviolet lamp as the light source to simulate the ultraviolet radiation and condensation in natural sunshine, and carries out the accelerated weather resistance test to obtain the result of the material weather resistance. It can simulate the environmental conditions such as ultraviolet, rain, high temperature, high humidity, dew condensation and darkness in natural climate. By reproducing these conditions, combining them into a cycle and letting it automatically execute the number of cycles.

LISUN UV aging test Chamber is designed for evaluating the resistant performance of non-metallic materials, organic materials (plastics, paints, coatings, rubbers, etc.) under the specified conditions such as sunlight, temperature, and other climatic conditions. It creates a man-made testing environment imitating the natural light source such as sunlight and other damages in the nature, such as rain and dew damage, to impose on the materials and to assess the degree of color changing and fading under the accelerated environment conditions. The chamber fully complies with the requirements of Standard ISO 4892-1, ISO 4892-3, GB/T16585-1996, GB14522-93, GB/T16422.3-1997, ASTMG53 and etc., provides the best UV sunlight simulation, and is easy to use and operate.

I. Structural Structure of UV Aging Test Chamber

1. Corrosion resistant stainless steel material is used for test box inner bucket. The outer box is made of A3 steel plate and sprayed plastic treatment. The sample rack is composed of gaskets and telescopic springs. Aluminum alloy material is adopted for equipment parts. The water pan in the box is also made of stainless steel, which can prolong the service life of the equipment.

2. Since the equipment needs to be tested for ultraviolet aging, including 8 fluorescent ultraviolet lamps, the lamps are installed in rows of four each, with a lamp center distance of 70mm and a lamp power of 40W. The length of the lamp tube is 1200mm. The uniform working area of the test box is 900*210mm. On the market, there are many types of ultraviolet fluorescent lamps, such as UVA-340, UVB-313, which are commonly used. Customers can choose appropriate light sources according to specific needs.

3. Test samples are fixed and installed at a distance of 50mm from the Z near parallel plane of the lamp table surface. The test samples and their supporting brackets form the inner wall of the box. The back side of them is exposed to the cooling air at room temperature. Due to the temperature difference between the test samples and the air in the box, the condensation phase on the test samples surface produces stable dew condensation conditions. The natural air convection should be generated from the bottom to the outer wall of the box and through the passage of the test samples.

4. Water vapor is produced from the low water pan of the heating box. The water depth is not more than 25mm, and there is an automatic water supply controller. The water pan should be cleaned regularly to prevent the formation of scale.

5. The temperature of the test box is measured by the sensor installed on the black plate with a width of 75mm, a height of 100mm and a thickness of 2.5mm. The black plate is placed in the center area of the exposed test. The measuring range of the thermometer is 30-80 ℃ and the tolerance is ± 1 ℃. The control of light and condensation phase should be carried out separately. The control of condensation phase is controlled by the heating water temperature.

6. The test box should be placed in a test room with a temperature of 15-35 ℃, 300mm away from the wall. It should be prevented from the influence of other heat sources. The air in the test room should not be strongly circulated in order to avoid affecting the light and dew condensation conditions.

II. Functions of Accessories of UV Aging Test Chamber

1. Pure water filter device: Everyone should know that pure water or filtered water should be used for test equipment. Therefore, the UV Aging Test Chamber can filter water by configuring the pure water filter device. The automatic water supply valve and the manual water supply drawer are usually installed in the water supply tank under the test equipment. If the filter device is installed, the automatic water supply valve is connected to the pressure water source. Once the water tank is short of water, the equipment water inlet solenoid valve is opened, and the filtered tap water enters the storage tank.

2. Automatic Lighting Protection Device: Due to the special nature of the test equipment, the photoelectric proximity switch is installed on the front and rear cover of the UV Aging Test Chamber. Once the box door is accidentally opened, the ultraviolet irradiation function can be automatically shut down. When the box cover is closed, the ultraviolet irradiation will be restored.

3. Use Radiation Meter: The instrument can be used to measure the real-time radiation. At present, the instrument adopts hand-held and installed type. The hand-held radiation meter is used in combination with the probe and the display screen. If the fluorescent lamp tube is opened under normal illumination, according to the wavelength of the lamp tube, the same wavelength band and measurement range radiation meter is selected on the display screen, and the probe is placed on the measurement hole of the specimen rack, the real-time radiation degree will be displayed on the display screen. The installation type radiation meter is to install its photosensitive probe in the box, and the probe faces the fluorescent lamp tube. The distance between the probe and the lamp tube is the same as that between the lamp tube and the specimen. The radiation value of this method will be displayed on the touch controller.

III. Analyze the three environments in the UV Aging Test Chamber

1. Condensation environment: many items are kept in the outdoor environment for a long time, and the cause of this long-term outdoor humidity is generally not rainwater but dew. Using the ultraviolet aging test box, its condensation effect can be used to simulate the outdoor corrosion, and in the test running cycle of the condensation, hot steam is produced after heating the water tank at the bottom of the equipment, and then the test laboratory is filled In this simulated environment, the relative humidity in the test room is kept at 99.99% and maintained at a high temperature. Since the sample is fixed on the side wall of the laboratory, the liquid water produced by condensation will always be exposed on the surface of the sample and in contact with the natural environment. Therefore, in the whole condensation cycle, the surface of the sample will always have liquid water produced by condensation.

2. Ultraviolet radiation: this is the basic function of the ultraviolet aging test box, which is mainly used to detect the resistance of objects in the ultraviolet environment. This simulated environment mainly uses ultraviolet light sources to simulate in order to obtain different ultraviolet radiation energy as the target. Different ultraviolet lamps should be selected, because different light sources will Obtain different ultraviolet wavelengths and radiation, users should still choose appropriate lamps according to the material test needs.

3. Rain test of the ultraviolet aging test box: there will be sunshine in daily life. Due to sudden rain, the accumulated heat will quickly disperse. At this time, the temperature of the material will suddenly change, thus producing heat shock, and the water spray of the equipment can also simulate the hot shock or corrosion caused by the sudden temperature change and rain washing. Object resistance.

IV. Industry suitable for UV Aging Test Chamber

Ultraviolet aging test box is suitable for a variety of different industries, such as automotive, construction, paint, coating, plastics, fiber, rubber, printing, electronics, paper, textiles, etc. These industries need to test the durability and stability of the products to ensure their quality and performance when used and exposed to the external environment for a long time.

In the automotive industry, UV Aging Test Chamber can test the durability and anti-aging performance of automotive parts and interior trim. In the construction industry, it can test the durability and durability of building materials and coatings. In the paint and coating industry, it can test the anti-aging performance and color stability of the coating. In the plastic and rubber industry, it can test the weather resistance of plastic and rubber products. In the fiber industry, it can test the durability and color stability of textiles. In the printing industry, it can test the lightfastness and color stability of printing products. In the electronics industry, it can test the weather resistance and stability of electronic components and products. In the paper industry, it can test the durability and color stability of paper and paper products.

In summary, the UV Aging Test Chamber is a kind of testing equipment widely used in different industries, which can test the durability and stability of various products to ensure the quality and performance of the products when used and exposed to the external environment for a long time.

Tags：UV-263LS