Classification of chemical reagents and common
The specifications of reagents in our country are basically divided according to the purity (the amount of impurity content), and there are 7 kinds of high purity, spectral purity, benchmark, spectroscopic purity, excellent purity, analytical and chemical purity. There are three main types of excellent purity, graded purity and chemical purity promulgated by the state and the competent authorities.
（1) Excellent grade pure (GR: Guaranteed reagent), also known as first-grade or guaranteed reagent, 99.8%, this reagent has the highest purity and the lowest impurity content, suitable for important and precise analytical work and scientific research work, using green bottle labels.
（1) Excellent grade pure (GR: Guaranteed reagent), also known as first-grade or guaranteed reagent, 99.8%, this reagent has the highest purity and the lowest impurity content, suitable for important and precise analytical work and scientific research work, using green bottle labels.
(2) Analytical purity (AR), also known as secondary reagent, is very high in purity, 99.7%, slightly inferior to excellent purity, suitable for important analysis and general research work, using a red bottle label.
(3) Chemical purity (CP), also known as tertiary reagent, ≥ 99.5%, the purity is quite different from the analytical purity, and it is suitable for general analytical work in industries, mines and schools. Use blue (dark blue) labels.
(4) Laboratory reagents (LR), also known as four-level reagents.
Common Quality Levels
Excellent purity (GR, green label): high content of main components, high purity, suitable for accurate analysis and research work, and some can be used as reference materials.
Analytical purity (AR, red label): high content of main components, high purity, low interference impurities, suitable for industrial analysis and chemical experiments.
Chemical purity (CP, blue label): high content of main components, high purity, and interference impurities, suitable for chemical experiments and synthetic preparations.
Experimental purity (LR, yellow label): high content of main components, poor purity, impurity content is not selected, only suitable for general chemical experiments and synthetic preparations.
Indicators and stains (ID or SR, purple label): A specific sensitivity is required.
Designated grade (ZD): a chemical reagent customized for a specific user according to the quality control indicators required by the user.
Electronically pure (MOS): suitable for the production of electronic products, with extremely low levels of electrical impurities.
Equivalent reagents (3N, 4N, 5N): The main component content is 99.9%, 99.99%, and 99.999% respectively. Recommended reading:What do AR, GR, CP, and USP stand for in the chemical reagent level?
