SeqLine Bio · Current-batch COA
Buyer guide · before payment
Check the current-batch COA before you pay
A COA describes one lot. Before you pay, confirm that the lot on the COA is the lot that will ship. It takes a few minutes and catches most document problems.
Which COA is this?
Four documents, four levels of evidence.
| Document | What it tells you | What it doesn’t |
|---|---|---|
| Sample or generic COA | The supplier’s document format and fields | Anything about current stock |
| Previous-batch COA | Past results for that compound | The quality of a later lot |
| Current-batch COA | Results for the lot you will receive, if the lot numbers match | Whether the material arrives as described |
| Your test of the received lot | An independent result on what actually arrived | Other lots |
How to match
Compare four things before paying.
- Product and strengthCompound name and strength per vial on the COA match the quotation line.
- Lot numberThe supplier confirms in writing that this lot will ship. On delivery, the label carries the same number.
- DatesManufacturing and test dates are recent, and any retest date is still ahead.
- Result vs specificationHPLC purity meets the stated specification and the MS mass matches the expected molecular weight. See how to read a COA.
Lot not made yet?
Agree the terms instead.
A lot produced to order has no COA until it is tested. Agree in writing that the COA will be sent before dispatch, which release specification applies, and what happens if the lot misses it.
Our quotation includes the COA for the lot you would receive. Every published lot is also in the public COA library with its lot number, HPLC purity against our NLT 98.0% release specification, MS identity, test date and a QR code to the online record.
After delivery, compare the label lot number with that record. Independent testing is welcome, and a confirmed quality issue is replaced or refunded under the quality policy.
FAQ
Questions buyers ask.
Why request the current-batch COA before payment?
Because it is the point where a mismatch costs nothing to fix. After payment, a wrong lot becomes a claim instead of a question.
Is a previous-batch COA useless?
No. It shows the supplier’s document format and past results. It does not show the quality of a later lot.
What gives stronger proof than a COA?
The same lot number on the COA, quotation and label, plus your own test of the received material. See independent peptide testing.
Next step
Send your compound list and document requirements.
We reply within 4 business hours with price, lead time and the COA for the lot you would receive.