GR grade, in the context of chemicals, stands for Guaranteed Reagent and signifies a high-purity grade suitable for analytical chemistry.
Understanding Guaranteed Reagent (GR) Grade
Guaranteed Reagent (GR) grade chemicals meet or exceed the purity standards established by the American Chemical Society (ACS) where applicable. This ensures that the chemical is of a quality suitable for reliable and accurate results in analytical and research applications. This is a trademark of EMD (MilliporeSigma).
Key Characteristics of GR Grade Chemicals:
- High Purity: GR grade chemicals are manufactured to minimize the presence of impurities.
- Analytical Suitability: They are specifically designed for use in analytical chemistry procedures.
- Meets ACS Standards: Where applicable, these chemicals meet or exceed the standards set by the American Chemical Society, providing a benchmark for quality.
Example of Other Common Chemical Grades:
| Grade | Description |
|---|---|
| AR | Analytical Reagent; a standard grade for laboratory and general use. |
| Reagent Grade | Generally suitable for laboratory and analytical purposes, though purity may vary. |
| Technical Grade | Suitable for general industrial or educational use, but not pure enough for food, drug, or medicinal use. |
| USP/NF | Meets standards set by the United States Pharmacopeia (USP) or National Formulary (NF) for drug substances. |
In summary, GR grade is a designation that indicates a chemical reagent's high purity and suitability for demanding analytical applications, often meeting or exceeding ACS standards.
