Chemicals quality level complex, many varieties, especially confusion. Usually conventional varieties (a class of agents) that is necessary for species, 225 species in our Beijing, Tianjin, Shanghai, Xi'an, Chengdu, Guangzhou, Shenyang chemical reagent production bases substantially complementary. II reagents used in almost all areas, but also manufacturers the necessary variety, there are about 1,800 to 2,000 species, such agents demand, widely used. Approximately three agents from 3000 to 6000 species, most of them related to the field of use of the national economy and industry agents such as chemical, metallurgy, electricity, food, medicine and other industries in particular use.
In China, the use of pure class distinctions, Fenxi Chun, chemical pure chemical reagents three levels represented, in accordance with national standards and ministerial standards People's Republic of China Ministry of Chemical Industry, a total of 225 kinds. This 225 kinds of chemical reagents in a standard form, provides the basis of the content of chemical reagents. Determination of the content of other chemicals are as a benchmark to determine the content by measuring. Therefore, the quality of these chemicals is very important. At the same time, these 225 kinds of chemical reagents due to the extremely versatile and became the basic varieties. This 225 varieties of chemical reagents directory are marked. In addition, special reagents, production of small, almost on demand quotas, the number is generally designated by the user.
Common quality level
Excellent level of pure (GR, green label): the main component content is high, high purity, for precise analytical and research work, and some can be used as reference material.
AR (AR, red label): the main component content is high, high purity, low impurity interference for industrial analysis and chemical experiments. ACS grade equivalent foreign (American Chemical Society Standards)
Chemically pure (CP, blue label): main ingredient content, high purity, there is interference of impurities, suitable for experiments and chemical synthesis.
Experimental pure (LR, yellow label): The main ingredient content, poor purity, impurity content not select applies only to general chemical experiments and synthesis.
And indicator dye (ID or SR, purple label): requires a unique sensitivity.
Specifies the level (ZD): according to user requirements to control quality index, made for a specific user chemical reagents.
Electronic pure (MOS): suitable for the production of electronic products, electrical low impurity content.
Equivalent reagent (3N, 4N, 5N): the main ingredients were 99.9%, 99.99%, 99.999% or more.
Pure spectrum: The main ingredient purity of 99.99%