What "identical to the last batch" can actually mean
By Mohamad Sinno, Charcoal Expert · Reviewed by Budi Dharmawan, Head of QC,
Ask AI for an importer brief:
It is the most reasonable request a repeat buyer makes and the one most often answered dishonestly. Two production runs of a coconut-shell product do not report the same digits. What can be held constant is the band, the method and the basis — and a certificate proving each run against them.
What can and cannot be promised
| Same contractual band, run after run | Yes — this is what a specification is for, and what the batch COA evidences each time. |
|---|---|
| Same method and same basis on every report | Yes. Without it the figures are not comparable, so consistency could not even be assessed. |
| Same laboratory | Usually, and worth agreeing. Two accredited laboratories can both be right and still differ slightly. |
| The same digits as last time | No. An agricultural feedstock varies, and a certificate repeating a previous one exactly is a reason for concern, not comfort. |
Our own reports are the worked example. Across 3 certificates the ash readings were 1.20–1.58% — one product, measured three times over two months. That is the shape of real variance, and it is why we publish the spread rather than the flattering end of it: what our laboratory reports measured.
Which leads to the sentence worth carrying into any contract negotiation: a sample batch is not a guarantee of month six — the batch COA is. (Trade convention as observed in supplier and buyer practice, August 2026.)
Retained samples
From every production tonne we draw 10 × 1 kg boxes, drawn at random and keep them for 5 years on open shelves in the factory warehouse. That is ≈1% of volume — ≈200 kg per 20 ft container — a real quantity of finished product held back rather than sold.
The point is that a dispute about a shipment eighteen months ago does not have to be argued from memory. The material still exists and can be re-tested.
The caveat, which we state up front rather than when it becomes inconvenient: Ash and fixed carbon remain stable in open storage; moisture drifts, and any comparison against a retained sample has to say so. Open shelving is honest storage for the mineral and carbon fractions and imperfect storage for water. A retained sample answers an ash or fixed-carbon question cleanly; a moisture comparison against one has to be read with that in mind.
Auditing a repeat order
The audit is short, and it happens before a claim rather than instead of one:
- Get the batch COA for the shipment, not a previous one and not a specification sheet. A COA is issued for every production batch, so one exists.
- Check it against the acceptance band agreed in your contract — the contractual band, not a website figure and not the previous batch's numbers.
- Confirm the basis and method match the ones your last comparison used. A figure that moved because the basis changed has not moved at all.
- If it sits outside the band, raise it with the export desk with the certificate and your contract line in front of you. A retained sample from that production tonne can be pulled and re-tested.
What a claim looks like once raised — evidence, timing, and what a supplier owes — is material for a dedicated page we have not published yet. Until then the export desk is the route, and the reorder QC checklist is the actionable version of the four steps above.
Two pages go further than this one does. The buyer's side of it, step by step from the code printed on the carton to the claims window, is the batch audit protocol. The reason there is anything to audit — what actually moves ash, moisture and fixed carbon between two batches of the same grade, with our own three certificates published as the spread they are — is why charcoal batches vary.
Before the audit, the document
None of this works without being able to read the certificate you are auditing against — how to read a charcoal COA line by line and what a COA proves and what it does not.