A high and low temperature test chamber is a device used to simulate different environmental conditions, and it is often used to test the performance and reliability of products under extreme temperatures. What is the purpose of the damp heat test? Who are the top ten manufacturers? Let's clarify these for you! ### What is the purpose of the damp heat test? The strictness level of the temperature cycle test is determined by the high and low temperature values, equilibrium time, transition time, and number of cycles that constitute the cycle test. Relevant specifications stipulate that the high and low temperatures should be selected from the test temperatures specified in GB/T2421-2001 *Test A: Low Temperature* and GB/T2423.2-2001 *Test B: High Temperature*. The number of cycles is generally 5, and the transition time is 2-3 minutes. ### Top ten manufacturers of high and low temperature test chambers #### Top 10 brands of high and low temperature test chambers - Guangzhou Spike Guangzhou Spike Environmental Instrument Co., Ltd. is a manufacturer with 20 years of focus on R&D and manufacturing of large-scale high and low temperature test chambers with military-industrial quality. Its products are widely used in military industry, aerospace technology, electrical and electronics, communications, automobile industry, biotechnology, semiconductors, plastic materials, etc. Main products include large constant temperature and humidity test chambers, high and low temperature test chambers, temperature shock test chambers, rapid temperature change test chambers, low pressure test chambers, dust test chambers, salt spray test chambers, HAST high-pressure accelerated aging test chambers, and three-comprehensive test chambers. Inheriting Japanese technology, the products are stable and reliable, serving 13,238 military-industrial enterprises and institutions such as China Aerospace and China Aviation. They are stable and durable with a service life of more than 15 years. Spike provides various environmental test systems that meet international and domestic industry standards such as IEC, ISO, GB, GJB, EIA, ASTM, IPC, ISTA, JEDEC, SAE, JIS, and MIL for various industries, and can customize various non-standard products and services according to user needs. After market trials and years of hard work, Spike Instruments has developed into one of the leading enterprises in the field of environmental test equipment. #### Top 10 brands of high and low temperature test chambers - Shanghai Espec Founded in 1947, Espec has been committed to the R&D, manufacturing, and sales of environmental reliability test instruments for nearly 70 years, and has built a brand image of excellent quality and sophisticated technology. The Espec Group has established multiple independent legal persons and institutions responsible for production, sales, and commissioned testing around the world. Its products introduce advanced technology and craftsmanship from Espec Japan, leading the industry at home and abroad. #### Top 10 brands of high and low temperature test chambers - Guangzhou No.5 Institute (GWS) The main products of Guangzhou No.5 Institute (GWS) include environmental test equipment, reliability test equipment, high and low temperature test chambers, and rapid temperature change test chambers. Guangzhou No.5 Institute Environmental Instrument Co., Ltd. (referred to as "Guangzhou No.5 Institute") is a wholly-owned high-tech enterprise, focusing on the R&D, production, sales, and service of reliability and environmental adaptability test instruments and equipment. #### Top 10 brands of high and low temperature test chambers - Weiss-Voetsch Weiss-Voetsch Environmental Test Instruments Co., Ltd. is a subsidiary of Germany's Weiss Umwelttechnik GmbH in China. Founded in 1941, Germany's Weiss Umwelttechnik GmbH mainly manufactures three industries: simulated environmental technology, industrial air-conditioning technology, and thermal energy technology. #### Top 10 brands of high and low temperature test chambers - Beijing Zhongdian Xingyi Beijing Zhongdian Xingyi Test Equipment Co., Ltd. is a high-tech company engaged in reliability environmental test equipment. Its main business includes the sales of mechanical equipment, instruments, and electronic products, providing high-quality products, good technical support, and sound after-sales service, and offering products that meet personalized needs for users. #### Top 10 brands of high and low temperature test chambers - Chongqing Yinhe Chongqing Yinhe Test Instrument Co., Ltd. was founded on August 9, 1979, with its registered address at No.81, Huhang Village, Xiema Town, Beibei District, Chongqing. Its business scope includes general projects: design, manufacturing, sales, technical consultation, and maintenance services of environmental test equipment, instruments, and accessories; import and export of goods. #### Top 10 brands of high and low temperature test chambers - Wewon Technology Wewon Technology, with the English name "wewon", mainly produces and sells low-temperature chambers, high and low temperature test chambers, low-temperature test chambers, high and low temperature chambers, drying ovens, constant temperature drying ovens, test chambers, and programmers. #### Top 10 brands of high and low temperature test chambers - Shanghai Juwei Shanghai Juwei Instruments is a Sino-foreign joint venture specializing in supplying environmental test equipment. Its technology originated in Taiwan, China, and was later extended to the mainland. Juwei was established in Shanghai in 2007 with a registered capital of 5 million yuan, integrating R&D, production, sales, service, and import and export trade. #### Top 10 brands of high and low temperature test chambers - Shanghai Farui Shanghai Farui Instrument Technology Co., Ltd. specializes in the production and maintenance of various quality testing instruments for metal and non-metal material industries such as automobiles, hardware, plastics, leather, and packaging. It is an emerging technology joint venture, providing quality testing instruments for various production-oriented enterprises. #### Top 10 brands of high and low temperature test chambers - Kunshan Quanyitong It is a professional manufacturer of quality control experimental instrument testing equipment. Founded in Taichung County, Taiwan, China in 1980, it established a factory in the mainland in 2000. It specializes in reliability environmental test equipment, and its main products include simulated environmental equipment, salt spray test machines, constant temperature and humidity test machines, high and low temperature test machines, temperature shock test machines, walk-in constant temperature and humidity laboratories, etc. ### Key points for purchase When purchasing a high and low temperature test chamber, the following aspects should be mainly considered: 1. Determine the purpose of the test chamber. What will it be used for? Is it to evaluate product quality or develop new materials? Different purposes require different test chambers. 2. Consider the temperature range of the test chamber. Common high and low temperature test chambers on the market are divided into low temperature, normal temperature, high temperature, and ultra-high temperature. Choose a test chamber with the corresponding temperature range according to your testing needs. 3. Select the appropriate size of the test chamber according to different usage sites and the size of the test products. 4. The temperature control accuracy of the test chamber is also an important consideration. The higher the temperature control accuracy, the higher the accuracy of the test data. 5. The choice of refrigerant is also crucial. Generally, refrigerants include R404A, R23, R134A, etc. Choosing environmentally friendly and non-polluting refrigerants is more friendly to the environment. 6. In terms of functions, high and low temperature test chambers generally have functions such as constant temperature and humidity, cyclic temperature control, and humidity control. Choose appropriate functions according to your testing needs. 7. For brand selection, you can choose some brands with good reputations, such as Shanghai Boyi, Chongqing Yinhe, and Guangzhou No.5 Institute. 8. Before purchasing the test chamber, it is recommended to understand the performance indicators, manufacturer qualifications, user reviews, and other information of the test chamber to better select a suitable one for yourself. ### Tips to avoid pitfalls When purchasing, the following two points need special attention: 1. **Don't just look at the price**: Although price is a factor to consider, you can't ignore the quality and performance of the equipment just for the price. Excessively cheap equipment may have problems such as poor performance and low durability. 2. **Understand the real performance of the equipment**: Before purchasing, you should understand the actual performance of the equipment through various methods, such as checking user reviews, communicating with manufacturers, and referring to evaluations on professional forums. Don't buy blindly based solely on the manufacturer's promotion. ### Tips for using high and low temperature test chambers 1. Equipment placement: Place the high and low temperature test chamber in a well-ventilated, dry, and stable environment, avoiding direct sunlight and high-temperature environments. 2. Sample preparation: Properly package and fix the test items according to the test requirements to ensure they are not affected during the test. 3. Operation specifications: Follow the equipment instruction manual for standardized operation. Do not arbitrarily adjust the temperature and humidity settings during the operation of the equipment. 4. Regular maintenance: Regularly clean, lubricate, and inspect the high and low temperature test chamber to ensure its normal operation. 5. Data recording and analysis: Record test data in detail during the test. After the test, analyze and process the data to provide a strong basis for product improvement. Sources: Spike, High and Low Temperature Test, Boyi Reliability Testing Equipment