If the CoA is not immediately available, submit a request via email to the distributor, ensuring you include the lot number for an updated document. 4. Understanding Unichem's Quality Commitment
: Solvents, acids, or volatile organic compounds can lose potency or absorb moisture over extended storage periods. Manufacturers frequently issue revised documents to extend shelf lives based on stable stability testing. unichem chemical reagents certificate of analysis upd
: Manufacturing date and Expiry or Recommended Retest date. Expand map If the CoA is not immediately available, submit
Maximum limits and measured results for heavy metals, trace elements, or water content. | | Description | Example | | :---
| | Description | Example | | :--- | :--- | :--- | | Header Information | Product name, manufacturer details (e.g., Unichem Chemicals), and physical description. | "Maleic anhydride, manufactured by Unichem" | | Batch/Lot Number | A unique identifier for the specific batch, crucial for traceability. | "GAPH1002" | | Specifications | The target ranges or limits for each quality parameter. | Purity: 99.0–101.0% | | Test Results | The actual measured values for each specification. | Assay (as-is basis): 99.87% | | Method of Analysis | The standard test method used (e.g., USP, EP, JP, or in-house method). | USP <621> Chromatography | | Expiration Date | The date after which the product should not be used or re-tested. | 2026-05-27 | | Authorized Signature | A signature from the manufacturer's quality assurance representative. | John Doe, QA Manager |
For pharmaceutical or critical analytical work, you must choose ACS, Reagent, or USP/NF grade chemicals. Using a lower grade could introduce impurities that compromise your results or, in the case of drug manufacturing, patient safety. A CoA provides the proof.
To ensure you have the most recent data for your reagents, follow these typical steps used by major suppliers like Unichem Specialty Chemicals :