For stable reagents, “Retest Date” means you must re-test the chemical before use after that date. It is often interchangeable with an expiration date for regulatory purposes.
Indicates the purity level (e.g., ACS Grade, HPLC Grade, Reagent Grade, USP Grade). 3. Lot and Batch Traceability Chemical manufacturing occurs in runs or "lots."
"Run it to the dock," Silas said, a hint of a smile cracking his stone face. "Good catch on the data, Thorne. A bad result is better than a lie. But a good result that's true? That's why we get paid."
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The specific production run identifier. This is critical for traceability.
Uni-Chem reagents are classified by grades, which are reflected in the specifications listed on the CoA:
12.2 ppm.
It was beautiful. A perfect batch. Elias smiled. He opened the CoA template on his computer. He typed in the results, feeling the satisfaction of a job well done. He was about to hit 'Print' when his eyes drifted to the bottom of the screen.
Uni-Chem's product portfolio encompasses multiple categories of chemical reagents:
If he typed "< 0.5 ppm", the printer would spit out the CoA. The truck would leave. Meridian would run their production. Nobody would ever know. Lead at 12 ppm wouldn't kill anyone instantly; it wasn't that kind of reagent. It was used for pH adjustment, not ingestion. It would just be... a little dirty. For stable reagents, “Retest Date” means you must
Think of the CoA as a "passport" for the chemical reagent. It guarantees that the product in your laboratory complies with its specifications and, when relevant, with industry standards such as ACS (American Chemical Society), USP (United States Pharmacopeia), or EP (European Pharmacopeia). Key Components of a Uni-Chem CoA
The validity period is tied to the product's re-test date or expiration date. Each COA includes a manufacturing date and either an expiration date or recommended re-test date. After this date, the COA is no longer valid for quality acceptance.
Never use a generic MSDS or specification sheet when you have a lot-specific CoA available. Conclusion A bad result is better than a lie
Used to confirm the identity of liquid reagents. How to Obtain a Uni-Chem CoA