Briefly introduce the two exposure methods of the UV aging test chamber

The UV aging test chamber uses a fluorescent ultraviolet lamp as the light source to conduct accelerated weathering tests on materials by simulating ultraviolet radiation and condensation in natural sunlight to obtain the results of the material’s weathering resistance. It can simulate environmental conditions such as ultraviolet, rain, high temperature, high humidity, condensation, and darkness in the natural climate. By reproducing these conditions, it can be combined into a cycle, and it can automatically complete the number of cycles.

When conducting aging tests in the UV aging test chamber, the surface temperature of the test piece is a very important exposure parameter. Generally, high temperature will accelerate the polymer interpretation process. The allowable test temperature should be determined based on the sample material and aging performance evaluation indicators;

1.  After a period of light exposure, the sample undergoes a cycle test without an irradiator. The test time is conducted according to relevant standards. If there are no specified cycle conditions, we recommend the following cycle methods:
 Irradiation exposure at a black standard temperature of 60 ℃± 3 ℃ for 4 or 8 hours; Then, expose to non irradiation condensation for 4 hours at a black standard temperature of 50 ℃± 3 ℃; It should be noted here that the aging degradation of some polymers (such as PVC) is very sensitive to temperature. In this case, it is recommended to use an irradiation exposure temperature below 60 ℃ (such as 50 ℃) to simulate a cooler climate;

When selecting the procedure of irradiation exposure followed by condensation exposure, the allowable irradiation or condensation exposure time is 2 hours in order to ensure that the conditions during each exposure period reach a balance;

2. After a period of light exposure for the sample, it is followed by a cycle test without an irradiator. The sample is subjected to continuous irradiation exposure and periodic water spray cycle tests. The test time is carried out according to relevant standards. If there are no specified cycle conditions, we recommend the following cycle methods:
Expose to radiation for 5 hours at a black standard temperature of 50 ℃± 3 ℃ and a relative humidity of (10 ± 5)% of the air, and then continue to expose to radiation at a black standard temperature of 20 ℃± 3 ℃ and spray water for 1 hour; Note: In the equipment, the exposed surface of the sample is moistened by condensation through a moisture condensing machine. The moisture is generated by heating water in the container located below the sample holder;

When the equipment does not meet the requirements of 1, the method of providing the relative humidity of the exposure chamber or spraying the sample with pure water or an aqueous solution simulating acid rain can be adopted;

When conducting tests in an ultraviolet test chamber, you can choose the exposure method according to your actual test requirements; Different test standards use different methods.

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.

Tags：UV-263LS