GR: Guaranteed reagent (superior pure reagent)
AR: Analytial reagent (analytical pure reagent)
CP: Chemical pure (chemical pure reagent)
LR: Laboratory reagent (experimental reagent)
Superior grade pure (GR, green label): high main component content and high purity, suitable for precise analysis and research work, with can be used as a reference material.
Analytically pure (AR, red label): high main component content, high purity, very low interfering impurities, suitable for industrial analysis and chemical experiments.
Chemically pure (CP, blue label): high content of main components, high purity, no interfering impurities, suitable for chemical experiments and synthetic preparations.
Experimental purity (LR, yellow label): high main component content, poor purity, no selection of impurity content, only suitable for general chemical experiments and synthetic preparations.
Extended information
"Chemical Reagent Label" carries information:
1. Registered trademark: clearly indicates the trademark registered by the manufacturer.
2. Quality standards: Quality standards are displayed in both colors and Chinese Pinyin codes. The color display area is the manufacturer information area at the bottom of the label; Chinese Pinyin codes (such as BZ, SH, DZ, SY) are marked in a prominent position.
3. Chinese name and type: The product name is mainly based on the "Systematic Naming Principles of Inorganic Chemical Substances" and "Systematic Naming Principles of Organic Chemical Substances" published by the Chinese Chemical Society in 1982, taking into account long-term use. Common name, trade name. And give the form or dosage form that can describe the chemical reagent as accurately as possible, such as: aqueous solution, alcohol solution, powder, block, rod, paste, and even the particle size such as 200 mesh, etc.
4. English name: The product name is mainly based on the "Systematic Naming Principles of Inorganic Chemical Substances" and "Systematic Naming Principles of Organic Chemical Substances" published by IUPAC in 1982, taking into account long-term common names and trade names.
5. CAS registration number: It consists of 9 digits in square brackets, divided into three parts by hyphens. For example, [58-08-2] is the CAS registration number of caffeine.
6. Molecular formula = molecular weight: Correctly write the simplified molecular formula, that is, the molecular weight formula, and accurately calculate the molecular weight according to the international atomic weight published in 1968. Such as NaOH=40.10.
7. Main ingredient content: The mass percentage content of the chemical reagent measured according to the molecular method specified by national standards or enterprise standards. Such as 99.9.
8. Packaging volume: The solid material gives the mass packaging volume of the chemical reagent, such as 1g, 5g, 10g, 25g, 100g, 250g, 500g, 1000g, etc. The liquid or gas gives the volume packaging amount of the chemical reagent, such as 1ml, 5ml, 10ml, 25ml, 100ml, 250ml, 500ml, 1000ml, etc.
9. Appearance: Use concise and accurate words to describe the color, smell, physical state and other physical states of the chemical reagent.
10. Physical constants: Measured values ??of physical constants such as "melting point, boiling point, density, viscosity, optical rotation, refractive index, solubility" are given in sequence.
11. Characteristic spectrum: Provides characteristic absorption peaks such as "ultraviolet, infrared, nuclear magnetic spectrum".
12. Content of interfering impurities: Give the accurate measurement value of the mass percentage of the main impurities, especially the mass percentage of the main interfering impurities.
13. Dangerous Goods Regulation Number: Dangerous goods must be marked with a dangerous goods regulation number. Production batch number: Give the production batch number to facilitate traceability.
Baidu Encyclopedia-Chemical Reagents