UV weathering test chamber (standard type)-Global supplier

307, Port Shenzhen International Center, Xinniu Road, Xinniu Community, Minzhi Street, Longhua District, Shenzhen, Guangdong Province

Equipment structure

The structure of the ultraviolet weather resistant box is a stainless steel inner box space, equipped with two rows of four lamps each to simulate ultraviolet light. The temperature of the inner box is increased through a humidification system to simulate a humid environment, and then combined with a sprinkler system to simulate rain. The three different environments are alternately cycled through program settings.

meet the standard

GB/T 14522-93 ； ASTM G 154,ISO 4892-1； ISO 11507 ； ASTMD 4329

Product Usage

The TL-UV series UV weather resistant box can simulate the hazards caused by sunlight, rainwater, and dew. UV uses fluorescent UV lamps to simulate the effect of sunlight exposure, and uses condensed moisture to simulate rainwater and dew. The tested material is placed in a cyclic program of alternating light and moisture at a certain temperature for testing. UV can reproduce the hazards that occur outdoors for months to years in a matter of days or weeks. The types of hazards include fading, discoloration, loss of light, powdering, cracking, turbidity, bubbles, brittleness, strength degradation, and oxidation. UV test data can help you select new materials and evaluate how changes in formulation affect the durability of new products.

Widely used in coatings, inks, paints, resins, plastics, rubber, printing and packaging, aluminum profiles, adhesives, automotive and motorcycle industries, cosmetics, metals, electronics, electroplating, pharmaceuticals, etc.

Test equipment

The structure of the test chamber is made of corrosion-resistant metal materials, including 8 fluorescent ultraviolet lamps, a water tray, a test sample holder, and temperature and time control systems and indicators.

2. The lamp power is 40W and the lamp length is 1200mm. The range of the uniform working area of the test box is 1140 × 500mm.

3. The lights are installed in four rows, divided into two rows. The tubes of each row of lights are installed in parallel, and the center distance of the lights is 70mm.

4. The test sample is fixedly installed at a position 50mm away from the nearest parallel plane of the lamp surface. The test sample and its bracket form the inner wall of the box, and their backs are exposed to cooling air at room temperature due to the temperature difference between the test sample and the air inside the box. To create stable condensation conditions on the surface of the test sample during the condensation stage, the test chamber should generate natural air convection through the outer wall of the chamber and the channel of the test sample at the bottom.

5. Water vapor is generated by a water tray located at the bottom of the heating box, with a water depth not exceeding 25mm, and equipped with an automatic water supply controller. The water tray should be regularly cleaned to prevent the formation of scale.

The temperature of the test chamber is fixed with a width of 75mm, a height of 100mm, and a thickness of 2.5mm The sensor on the black aluminum plate (blackboard) is used for measurement, and the blackboard should be placed in the central area of the exposure test. The measurement range of the thermometer is 30-80 ℃, with a tolerance of ± 1 ℃ The control of lighting and condensation stages should be carried out separately, while the condensation stage is controlled by the heating water temperature.

7. The test chamber should be placed in a test room with a temperature of 15-35 ℃, 300mm away from the wall, and should prevent the influence of other heat sources. The air in the test room should not circulate strongly to avoid affecting the lighting and condensation conditions.

Test conditions

1. The fixed device for the test sample is placed on the test rack, facing the fluorescent lamp. When the sample rack is not filled with the sample, a blackboard is needed to fill the rack and keep the inner wall of the test box closed.

2. Test temperature. When illuminated, three temperatures of 50 ℃, 60 ℃, and 70 ℃ can be used, with 60 ℃ being the preferred temperature; The temperature during the condensation stage is 50 ℃, with a temperature tolerance uniformity of ± 2.

4. The condensation cycle for each illumination can be selected from two cycles: 4H illumination and 4H condensation, or 8H illumination and 4H condensation.

After the first illumination of 400-450H, each row of lamps needs to be replaced with a fluorescent lamp, and the other lamps should be compensated for the losses caused by lamp aging according to the lamp cycle and replacement method. This operating mode ensures that the service life of each lamp tube is around 1600H.

When replacing the lamp tube, the water tray should be wiped dry and cleaned to avoid the formation of scale.

Test samples and performance evaluation

1. Appearance evaluation: The evaluation of coatings mainly focuses on appearance, and plastic and rubber can also be evaluated for appearance when necessary. The inspection items mainly include gloss, color changes, powdering, spots, bubbles, cracks, and dimensional stability. Quantitative item testing should be carried out using instruments as much as possible, such as gloss and colorimeter.

2. Evaluation of mechanical and other properties: Generally, rubber materials are measured for tensile strength, elongation, hardness, impact strength, elongation at break, tensile strength, and bending strength. If necessary, other performance testing items may be specified.