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 The testing principles mentioned therein are still used, and the testing equipment has been replaced by more accurate automated instruments.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.
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