Charcoal samples: getting them, testing them, making them enforceable
By Mohamad Sinno, Charcoal Expert · Last updated
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Almost every charcoal supplier will send you a sample for nothing. That is not a concession, and it is not evidence: a parcel a factory chose to send says what the factory can make on a good day, and nothing at all about what leaves the yard in a container three months later. The gap between those two things is where most sourcing disputes live, and it closes in writing rather than in the parcel. This page is about all three steps — what arrives, how to read it, and how to make it count.
What a sample can and can't prove
A sample proves capability. It tells you the factory can press a briquette of that shape, that density and that finish, and that somebody there knows what good looks like. That is genuinely worth knowing, and it rules out a class of supplier quickly.
What it cannot prove is consistency, because consistency is a property of a system rather than of an object. The quality-control firms that write about this for a living put it flatly: a passed sample guarantees nothing on its own, and what protects a buyer is a documented reference sample, inspection staged through production, and the balance payment held until an inspection passes (cmgm.net, quality-inspection service, 19 July 2026). A sourcing agent writing on the same problem adds the part buyers most often skip — put the hold in writing, because a balance you have already wired is not leverage (rich-bee.com, sourcing agent, 17 June 2026).
Both of those are conventions from general goods sourcing, not charcoal-specific rules, and neither is a standard anybody holds. They are cited here as what the trade does, dated, so you can weigh them for what they are. The charcoal-specific half — what actually varies between a sample and a run, and why — is on why bulk sometimes differs from the sample.
What we send, and on what terms
Ours are set out below so you can compare them against anyone else's. The line that matters most is the last but one: the sample carries the certificate of analysis for the batch it came from, which is what makes it checkable rather than merely nice.
| Term | What applies |
|---|---|
| Cost | Free |
| Quantity | 1–10 kg |
| Freight | Paid by the recipient |
| Paperwork | A batch COA accompanies every sample |
| Dispatch | Dispatched within 2 working days |
| Obligation | None |
Samples ship by air as declared dangerous goods through our DG forwarder; availability depends on the destination country; for the USA, confirm case by case with the export desk; delivery cost is on the buyer. That is not a formality — charcoal is UN 1361, Class 4.2, Packing Group III, and a supplier who sends a sample as ordinary air freight is telling you something about how they will ship a container. The reasoning is on UN 1361 and the IMDG 42-24 amendment.
A COA is issued for every production batch. Each COA states its own validity — 90 days from issue on current certificates. The certificates behind the published figures, with the laboratory named and the method printed beside every value, are on the certificate of analysis page.
The evaluation protocol
A scorecard beats an impression, and the reason is not rigour for its own sake. Two people handling the same sample a week apart will remember different things; a written score is the only version of an evaluation that survives into a negotiation, and it is the thing you compare the bulk against later.
Half the scorecard is what the factory already records and can hand you. Samples are drawn at 6 stages — carbonization, screening, grinding, mixing, extrusion, drying — at random, at least five pieces per 50 kg, and weight, ash content, moisture, ash colour are recorded for each. Per batch, the file holds the laboratory COA and the factory’s own results for the batch: ash content, moisture, burning time, drop test, cracks, temperature. The other half is what you can observe in your own workshop with no equipment at all, and it is the half most buyers under-use.
The full method — the parameters, what each one tells you, the buyer-side observations taken from dated supplier and content-site conventions, and where the score bands fall — is on how to evaluate a charcoal sample: the scorecard method.
Making the sample enforceable
This is the step that is almost always skipped. A sample is approved by WhatsApp message, the order goes ahead, and nobody writes down what "approved" referred to. When the container lands and something is different, both sides are arguing from memory about an object that is no longer in the room.
The fix is old and unglamorous: the approved sample becomes a named reference in the contract, and the fields it fixes are ones an inspector can measure. Adjectives are the failure mode here; a sourcing agent's version of the rule is that a colour or grade word is unenforceable while a named sample number with a stated tolerance is enforceable (rich-bee.com, 17 June 2026). On our product the measurables are already there to be named: dimensions carry a tolerance of ±0.3 mm per side, the packing counts are nominal counts made at packing, the certificate values come with their methods, and the drop test has a written pass criterion.
The clause itself, taken apart line by line with what each line is doing and where the wording usually goes soft, is on the golden sample clause. It is practice rather than legal advice, and it says so.
Two first-party pieces sit behind that clause and are worth knowing before you draft one. We retain 10 × 1 kg boxes, drawn at random per tonne for 5 years, so a comparison against what actually shipped is possible years later — with one honest caveat: Ash and fixed carbon remain stable in open storage; moisture drifts, and any comparison against a retained sample has to say so. And the claims window is short and stated: within 7 days of receipt; after that the goods are deemed accepted, with the remedy being replacement or credit on the next order. A clause that names no window inherits whatever the law of the contract supplies, which is rarely what either side pictured.
What the acceptance criterion actually is
One test on our side is worth stating in full, because it is the one a buyer can repeat and because a clause can point at it.
- Cube. The piece is heated until glowing red, held five minutes after heating, then dropped five times from 1.2 m onto a hard tiled surface. It must not break.
- Hexagonal. Three drops from 50 cm.
It is a hot test rather than a cold one, which is the point — a briquette that survives a drop from the box and then crumbles in a bowl has passed the wrong exam. A clause can name that method and its criterion directly, and then a disagreement is a test rather than an argument.
What is not on this page, and why
No burn-minute figures of ours. Burning time is recorded per batch in the factory's own file, and that is as far as this site will take it. A burn figure is only meaningful with its method — the burner, the ambient conditions, one piece or a full bowl — and no such method has been written down here. Every supplier method page in this subject publishes its minutes anyway; comparing two of them is comparing two unstated experiments.
No bench log. This page was planned around one: a real inbound sample scored on the published scorecard, dated and shown. We have not scored one that way and writing a plausible entry would be manufacturing the exact evidence this cluster tells buyers to insist on. It is a gap, it is ours, and it closes the first time a sample is scored on the published form and the sheet records it.
No downloads. The scorecard and the clause are tables on their own pages, readable without giving anyone an email address. A file version is worth having and is not worth inventing a form for.
Sample-stage Q&A
Is a free sample really free, or is it deducted from the first order?
Ours is free with no obligation, and nothing is deducted or recovered later — the freight is the buyer's, which is where the cost actually sits. Elsewhere in general sourcing the common convention is a sample fee credited against the first bulk order, so it is worth asking which arrangement you are in before the parcel moves.
How much charcoal do I need to evaluate properly?
Enough to do the destructive parts more than once and still have pieces left to keep sealed as a reference. Our sample range is 1–10 kg, and the practical answer is at the upper end of it if you intend to run the drop test and hold back a counter-sample, which you should.
Will a factory sign that the sample is binding?
We do. On the buyer’s request, the factory signs a retained-sample agreement making the approved sample the production reference for the order — The terms are not recorded on our side: the buyer proposes the form, and we have no house template to push at you. A supplier who will not put the approved sample in the contract at all is telling you what they expect the bulk to look like.
The sample was excellent and the container was not. What now?
Photograph and document before you complain, and do it against the batch code on the cartons rather than against a general impression, so the conversation is about one identified batch. Then read the window in your contract: ours is within 7 days of receipt; after that the goods are deemed accepted. The causes, honest and dishonest, and the protections that close the gap are on why bulk sometimes differs from the sample.
Asking for one
This cluster is the reading; the request itself is one page over, on free charcoal samples. Say the shape, the size and the destination country, and the batch certificate travels with the parcel. WhatsApp +62 821 3924 038 if you would rather ask a question first. The sample is move three of the five in the shisha charcoal buyer's guide, after identity and production and before the contract that makes it count.