Professional terms and definitions of sand and dust test chamber: Dust: particles with a specific source or composition, and a size of 1μm ～ 150μm Dust concentration: the total mass of dust particles per unit volume of air. Humidity: Relative humidity is defined as the ratio of the actual vapor pressure at any temperature to the saturated vapor pressure at temperature. Hygroscopic: Ability to absorb moisture. Particle size: Assuming that the particles are spherical, the combined size of dust and particles is generally determined by sieving, calculating sedimentation, or measuring micrographs. Sand: spherical or angular particles with a size of 100 μm to 2000 μm. For environmental tests, the size is generally limited to 150 μm to 850 μm. Sieve: A sieve that meets the standard requirements and is used to determine the particle size of the material being sieved. China's industrial development has been growing rapidly for many years in a row. China has become the world's largest industrial production distribution center. To promote the steady growth of China's industry, many scientific research machinery in China have launched a new round of scientific research power plan, forming a new industrial system in China and giving environmental testing equipment With the new development opportunity of the industry, the demand for environmental test chambers of many scientific research institutions has surged. At the beginning of the reform, most of the environmental test chambers depended on imports. High and low temperature test chambers, constant temperature and humidity test chambers, salt spray corrosion test chambers and other environmental test equipment were often monopolized by a few foreign companies. China's reform and opening up has also brought vitality to the environmental testing equipment industry. Domestic companies have introduced advanced foreign production technologies, created their own national brands, and a large number of excellent domestic environmental testing equipment suppliers have emerged. Corner Sofas,White Corner Sofas,Sponge Corner Sofas, Sectional Corner Sofa INCHEE FURNITURE CO.,LTD , https://www.incheefurniture.com