This page belongs to our Products pillar and is the answer to the question every repeat buyer eventually asks. Consistency is not a claim you can verify from a website, so what follows is the mechanism instead: what is measured, by whom, what is retained, and what the remedy is.
Consistency at a glance
Batch consistency is the degree to which each production batch matches the agreed specification — measured per container by an independent laboratory, documented on a certificate of analysis, and evidenced by a retained physical sample.
- Independent testing
- every container, by Carsurin
- Retained batch samples
- 5 years
- Loading surveyor
- Paid by the factory, included in FOB — or nominate your own
- If a batch misses spec
- Usually replacement on the next shipment; a credit is also possible
Consistency as a system, not a promise
Any supplier can promise consistency. What a buyer can actually check is whether there is a measurement, an independent party, a retained physical record, and a stated remedy — because those are the four things that still exist when the promise is tested. All four are set out below, in the order they happen: production, testing, documentation, and what we do when a batch is outside the agreed range.
None of this makes variance impossible. It makes variance visible, attributable to a specific batch, and answerable.
The per-order certificate of analysis
Every container is tested before loading. Our in-house lab runs the full spec panel, and an independent laboratory — Carsurin — verifies ash content, moisture, fixed carbon and volatile matter on every container. The certificate of analysis reports the measured values for your specific batch, not the catalogue targets: ash and the proximate analysis to ASTM D1762-84(2021), calorific value to ISO 18125:2017.
The certificate of analysis is inside the FOB price and ships with every container. You are not billed separately for the evidence that the batch meets the specification you ordered.
The full test methods and standards What each measured value means
Retained batch samples
We keep a physical sample of every production batch for 5 years. That is the part of a consistency system buyers almost never get in writing, and it is what makes a dispute resolvable: if a container is questioned, there is a retained sample of that specific batch to test against, rather than two parties comparing recollections.
It also means a repeat order can be matched against what you approved. If you reorder a size and grade you bought two years ago, the reference for "the same as last time" physically exists.
Who watches the loading
An independent marine surveyor attends loading, checks the packing against the packing list, and issues the container vanning certificate that confirms the container is packed and secured per the IMDG Code. That surveyor is paid by us and included in the FOB price — it is not a line item that appears on your invoice.
If you would rather appoint your own surveyor or inspection agency, you can, at your cost. We have no objection to a buyer's inspector on the loading bay, and buyers who are placing a first container often send one.
What happens if a batch misses spec
If the certificate of analysis for a container falls outside the agreed specification, the usual remedy is replacement on the next shipment; a credit is also possible. Which one applies is settled case by case against the measured deviation and what it cost you — a batch half a point over on ash is not the same conversation as a batch that arrived wet.
We state this as practice rather than as a warranty, because it is practice. What is fixed is the evidence trail that makes the conversation possible: an agreed written spec before production, an independent measurement per container, and a retained sample of the batch in question.
- Agree the specification in writing before production — the proforma invoice carries it.
- Receive the certificate of analysis for your batch with the shipment.
- If a value is outside the agreed range, send us the COA reference and your own test result if you have one.
- We test the retained sample of that batch and agree the remedy against what the measurements show.
Why variance happens at all
It would be easy to write that our process eliminates variation. It does not, and a buyer who has been in this trade for a while would not believe it. Coconut shell is an agricultural by-product, and three things move underneath it.
- Shell source
- Shell arrives from a network of partner villages across several regions. Maturity and density vary with the tree, the harvest and the season, and that variation carries into ash content before any of our own process touches it.
- Carbonization source
- Most of our charcoal is carbonized at our own plant in Bitung; we supplement from vetted suppliers to meet demand. Two kilns run by two operators do not produce identical char, so supplemented material is checked on intake against the same standard and is one of the things the per-batch COA is there to catch.
- Weather
- Central Java has a wet season. Ambient humidity changes how much moisture the raw char carries into the press and how long drying takes to reach the same end point.
- Drying
- Drying is the step where a schedule gets compressed under delivery pressure at some factories. Under-dried briquettes arrive heavier, burn worse and can self-heat in transit, which is exactly the failure mode UN 1361 exists for.
What the system above does is catch those effects before the container sails, rather than letting your customer discover them. That is a different claim from "every batch is identical", and it is the one we can actually stand behind.
Match the container to the sample you approved
The simplest way to keep container two like container one is to be specific about what one was. Order the exact combination you sampled — shape, size and grade — and reference the approved sample on the proforma invoice. A sample approved as "your 25 mm cube" leaves the grade open, and the grade is what sets ash.