It involves the classification of chemical reagents.

China's reagent specifications are basically divided into purity (how much impurity content), a total of high purity, spectral purity, benchmark, spectroscopic pure, excellent grade pure, analytical and chemical purity. The state and the competent authorities promulgate three main types of quality indicators: pure, graded pure and chemically pure.

(1) Excellent grade (GR: Guaranteed reagent), also known as first grade or guaranteed reagent, 99.8%. This reagent has the highest purity and lowest impurity content. It is suitable for important and precise analytical work and scientific research. .
(2) Analytical purity (AR), also known as secondary reagent, with high purity, 99.7%, slightly below the pure grade, suitable for important analysis and general research work, using red bottle label.
(3) Chemically pure (CP), also known as tertiary reagent, ≥99.5%, the purity and analytical purity are quite different, suitable for industrial and mining, general analysis of schools. Use a blue (dark blue) label.
(4) Experimental reagent (LR: Laboratory reagent), also known as a four-stage reagent.

In addition to the above four levels, there are currently on the market:
Benchmark Reagent (PT: Primary Reagent): It is used as a reference material and can be directly prepared into a standard solution.
Spectroscopic reagent (SP: Spectrumpure): indicates that the spectrum is pure. However, since the organic matter is not displayed on the spectrum, the main component may not be more than 99.9%, and care must be taken when using it, especially when it is used as a reference material.

A reagent with a purity much higher than that of a pure grade is called a high purity reagent (≥ 99.99%).

At present, the specifications of chemical reagents produced by foreign reagent factories tend to be classified according to their uses. The common ones are as follows:

Biochemical reagent (BC: Biochemical)
Biological reagent (BR: Biological reagent)
Biological stain (BS: Biological Stain)
Complexometric titration (FCM: For Complexometry)
For chromatography (FCP: For chromatography purpose)
Fluorescence analysis (FIA)
Microbial (FMB)
For microscope (FMP: For microscopic purpose)
For synthesis (FS: For synthesis)
Gas chromatography (GC: Gas chromatography)
High Pressure Liquid Chromatography (HPLC)
Indicator (Ind: Indicator)
Infrared absorption (IR)
Liquid chromatography (LC)
Nuclear magnetic resonance (NMR)
Organic Analytical Standard (OSA)
For analysis (PA: Pro analysis)
Pract: Practical use
(Pure purum pure)
Puriss (Purissmum pure)

Synthesis (SYN)
Industrial Tech: Techincal grade)
Thin layer chromatography (TLC)
Spectroscopic pure, optically pure, pure spectrophotometric pure (UV: Ultra violet pure)

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