Zhengzhou Changcheng Technology Industry and Trade Co., Ltd. was founded in 1988 and is a technology innovation enterprise that integrates research, development, manufacturing, and operation. Our enduring philosophy is technological innovation, serving society, and dedicating ourselves to education and science. Long term research and continuous technological accumulation have provided excellent equipment for research and industrial applications in fields such as chemistry, chemical engineering, biology, pharmaceuticals, new materials, new energy, electronics, metallurgy, petroleum, and machinery. The Zhengzhou Great Wall brand has long received industry attention and is highly favored by customers. After long-term research and development and continuous technological accumulation, our products are distributed across four continents: Asia, Europe, the United States, and Australia, covering most universities, research institutes, and enterprise laboratories in China. The company currently has three main product lines: high and low temperature sources and temperature control, vacuum acquisition and control, separation and reaction equipment and control. There are more than ten series and over one hundred models of scientific, educational, and industrial equipment, including closed refrigeration and heating cycle devices, circulation coolers, high-temperature circulators, low-temperature constant temperature stirring reaction baths, pilot low-temperature equipment, diaphragm vacuum pumps, circulating water multi-purpose vacuum pumps, vacuum controllers, rotary evaporators, glass reaction kettles, and heat collecting constant temperature magnetic stirring baths. The company's products have won bids for World Bank education projects, teacher education development projects, and nearly 100 university laboratory projects. Professors and engineers lead the research and development, while engineers and masters form the technical team, possessing 78 patents related to vacuum and refrigeration experimental equipment. Our product line, marked by high and low temperature sources and temperature control, vacuum acquisition and control, has long been a leader in the industry's development. Collaborate at multiple levels with universities and research institutes to establish joint laboratories, graduate teaching bases, and undergraduate internship bases. Discipline leaders and PhDs in related fields participate in the company's scientific exploration and product development. The company received the first batch of project support from the Small and Medium sized Enterprise Innovation Fund of the Ministry of Science and Technology in 2011, as well as support for multiple provincial and municipal scientific and technological research projects. Multiple products were recognized as the first major technical equipment in the province and were designated as city level enterprise technology centers. Recognized as a "Henan Province Science and Technology oriented Small and Medium sized Enterprise" by the Henan Provincial Department of Science and Technology; The Municipal Development and Reform Commission has recognized it as the "Zhengzhou Low Temperature Instrument and Equipment Engineering Research Center". The company has obtained ISO9001 international quality system certification and the brand has been awarded the famous trademark in Henan Province. Recognized as a national high-tech enterprise and an innovative pilot enterprise in Henan Province; For more than 10 consecutive years, it has been a "contract abiding and credit worthy" enterprise at the provincial and municipal levels; The Provincial Technical Supervision Bureau has awarded it the title of "Quality Key Tracking Enterprise", the Municipal Technical Supervision Bureau has awarded it the title of "Quality and Measurement Trustworthy Unit", the Provincial Product Quality Supervision and Inspection Institute has awarded it the title of "Product Quality Trustworthy Unit", and the China Market Supervision Center has awarded it the title of "China's Model Industry of Honesty, Contract Compliance, and Quality Supervision".