Specific surface area testing currently employs many standards in various industries in China. Some industry standards were promulgated earlier. The testing principles mentioned therein are still used, and the testing equipment has been replaced by more accurate automated instruments. At present, it is mainly the gas adsorption BET specific surface area test that is in line with international standards, which is also the most commonly used test standard in China. The standard was jointly promulgated by the General Administration of Quality Supervision, Inspection and Quarantine and the National Standardization Management Committee in 2004. The standard name: gas adsorption BET method for the determination of the specific surface area of ​​solid materials, standard number GB / T 19587-2004. This standard is the parallel standard of ISO 9277: 1995, NEQ issued by the international ISO organization. At present, all the products produced by our company have passed the certification of this standard.
Direct contrast method specific surface area test, the corresponding standard is "Determination of carbon black specific surface area-nitrogen adsorption method" (GB 10722-89), direct comparison requires the use of standard samples for comparison, only when the measured sample and standard sample adsorption characteristics are similar , The test results will be relatively accurate. Since the most commonly used standard sample is carbon black, the results of the direct comparison method for measuring carbon black samples have higher accuracy, and when used in different types of samples, the reliability is much lower. It can be said that the direct comparison method is aimed at some production enterprises for online production testing equipment, which greatly meets the rapid product quality inspection. With the development of nitrogen adsorption test technology, the direct comparison method is gradually replaced by the stronger BET method based on theory. At present, the products sold by our company mainly use the BET method to measure the specific surface area.
Crowd Control Barrier
This garden border garden fence Traditional hoop top fence. This steel garden border fence is Green PVC coated. This garden fencing is Attractive and functional. These coated garden wires are easy to erect with no need for straining wires. This metal garden PVC wire has self supporting spiked legs. These garden border fencing will create either low border fence or decorative mid height fence.
Expanded Metal is a versatile and
economical product. Made from a sheet of metal uniformly slit and
stretched, forming diamond-shaped openings in the sheet - Expanded is a
one piece construction that won't unravel and under normal circumstances
and will hold its shape for many years. The strands and bonds of the
diamond-shaped trusses add strength and rigidity. Expanded Metal comes
in a standard (raised) or flattened diamond pattern in a variety of
gauges, opening sizes, materials and sheet sizes.
Expanded Metal is typically used for
screening, ventilating or security as a guard. The openings permit
passage of light, air, heat and sound, and sheet is lightweight and easy
to fabricate and form. Decorative patterns have the same properties and
are used aesthetically. Decorative patterns may be found in
applications like retail shelving, signage, partitions, ceiling tiles,
and more.
Crowd Control Barrier,Garden Border Fence,Standard Expanded Metal,Panel Expanded Metal Mesh
Anping Chuangqian Wire Mesh Co., Ltd , https://www.cqwiremesh.com