Dongguan Ai Siyi instrument professional and reliable environmental test equipment manufacturer, has a number of patented technology, also has a professional R & D, production and after-sales service team, from product development to after-sales service, every aspect of the customer's point of view And demand as the starting point for thinking. Accumulate rich product development experience in the field of environmental reliability test equipment industry, product control system development capability, production capacity, design capability and other capabilities are superior, constantly self-challenge in product innovation, and Taking advantage of its advantages, the company has become a long-term close partner of many large factories. The programmable constant temperature and humidity machine is used in the wet heat aging test of plastics and is a test method for accelerated aging of plastics. Many plastics are aged in the atmosphere due to the heat and humidity. In some specific environments, such as underground engineering, the plastics used in high-humidity heat plants are more affected by damp heat aging. Therefore, a damp heat aging test is used to accelerate the aging of the plastic and to measure the change in performance after aging, thereby evaluating the wet heat aging resistance and the estimated life of the plastic. Principle of plastic damp heat aging test: When the plastic material is exposed to the moist hot air environment, the performance change will occur after the damp heat is applied. The heat and humidity resistance of the material is evaluated by measuring some performance or appearance changes before and after the exposure under the specified environmental conditions. First, the standard of programmable constant temperature and humidity machine: Exposure of plastic under constant humid heat conditions (GB12000) and GB/T15905 vulcanized rubber damp heat aging test method. Second, the programmable constant temperature and humidity machine consists of: The constant temperature damp heat test chamber is composed of a box body, a heat preservation system, a control system, a freezing system, a protection device, and a power source. a, with temperature, humidity adjustment and indicating instruments, water shortage protection and alarm system; and with lighting and observation doors (window). b. The temperature can be adjusted from 40 to 70 °C, the temperature uniformity is less than (equal to) 1 °C fluctuation, and the relative humidity can be adjusted from 80% to 95%. c, temperature tolerance ± 2.0 °C, relative humidity tolerance is 2 minus 3%. d. The wind speed should not exceed 1 m/s, and air circulation should be maintained at any point in the effective space. e. Condensed water does not fall into the working room. Third, the damp heat aging test general test conditions: a, temperature (40 ± 2) ° C, accelerated aging, the temperature can be appropriately increased, but not more than 70 ° C The relative humidity is 93%, which can be specified in accordance with relevant technical specifications and various aspects of the agreement. b. The test period is determined according to the use of the material, and the performance termination value may be predetermined and then selected, and the number of general cycles is not less than 5. The first category: 24h, 48h, 96h, 144h, 168h; The second category: 1 week, 2 weeks, 4 weeks, 8 weeks, 16 weeks, 26 weeks, 52 weeks, 78 weeks. c. Test water, deionized water or distilled water. d, state adjustment: temperature (23 ± 2) °C, relative humidity 50% ± 5 % and air pressure 86 ~ 106kPa, time is at least 86h. Which is a programmable constant temperature and humidity machine? "Ai Siwei" is more professional 100% quality assurance, buy a programmable constant temperature and humidity machine to Ai Si, there is always a test box is what you need. Tool Case For Instrument,Tool Case For Instruments,Tool Case For Measuring Instruments,Instrument Suitcase Aluminum Tool Case Changzhou Junye Aluminum Case Co., Ltd , https://www.junye-box.com