To obtain a result of analysis for a coconut charcoal shipment, draw a composite sample from the packed lot, send it to a KAN-accredited Indonesian laboratory that tests to ASTM or SNI methods, and request ash, moisture, calorific value, fixed carbon, volatile matter and burn time. Results typically come back within one to two working weeks.
Indonesia is the dominant global origin for coconut-shell charcoal, so the labs, methods and paperwork for testing this product are more developed here than anywhere else. A proper report costs a small fraction of a container’s value and settles arguments before they start.
Why do buyers ask for a result of analysis in the first place?
Because grade claims set the price. As of 2026, premium shisha-grade briquettes (ash <=2.5%) run USD 1,250-1,500 per metric ton FOB Indonesian port, while BBQ coconut-hardwood blends trade at USD 700-1,000/MT. The only thing separating those bands is a set of measured numbers — ash, moisture, fixed carbon, calorific value — and the only credible source of those numbers is an accredited laboratory. A result of analysis (ROA) is the lab's raw report: the measured values for one identified sample, with the test methods, the test date and the analyst's stamp. Disciplined exporters build their COA per batch on exactly these reports — the certificate you receive with the shipping documents is the formatted, lot-referenced summary of an underlying ROA. If a supplier can show the certificate but not the laboratory report behind it, ask harder questions.
How do you sample the lot correctly?
A perfect lab test on a bad sample is worthless — the result describes only what is in the bag. For a one-container order, the standard MOQ of roughly 17.5-18 metric tons, work through these steps:
- Sample after packing, not from the production line. Moisture changes during cooling and boxing; test what will actually ship.
- Pull from at least 8-10 cartons spread across the lot — different pallets, different production shifts if the lot spans more than one day.
- Take whole cubes, not fragments. Broken pieces skew burn-time and ash results.
- Combine into one composite sample of 1-2 kg, mix, then split it in half by quartering.
- Seal both halves in airtight bags with the lot number, production date and packing date written on each.
- Send one half to the laboratory; retain the other as a counter-sample in case results are disputed.
- Photograph the sealed bags next to the marked cartons. If a claim arises months later, that photo ties the sample to the lot.
Buyers who want independence from the supplier can appoint a surveyor to draw the sample at the warehouse or at Benoa, Tanjung Priok, Tanjung Perak or Semarang before loading — sampling under the buyer’s control is the strongest form of the exercise.
Which laboratory should test the shipment?
Use a laboratory accredited by KAN (Komite Akreditasi Nasional), Indonesia’s national accreditation body, to ISO/IEC 17025 — the international standard for testing-lab competence. Accreditation matters because it is checkable: every KAN-accredited lab has a registration number and a published scope you can verify.
Before booking, confirm five things:
- Scope covers solid fuels or charcoal, not just food or water testing — accreditation is parameter-specific.
- Methods are stated on the quote. Proximate analysis of charcoal (moisture, ash, volatile matter, fixed carbon) follows the ASTM D1762 approach; calorific value is measured by bomb calorimetry.
- Burn time can be tested. Not every lab runs a timed combustion test; premium shisha buyers ask for it, so choose a lab that reports it.
- Turnaround and report language. Ask for the report in English with the accreditation number printed on it.
- Reference verification. A genuine lab will confirm one of its own report numbers if a buyer emails to check.
Established testing houses in Indonesia — the state-owned surveyor Sucofindo, plus international groups such as SGS and Intertek — run charcoal and solid-fuel work routinely.
What parameters should the report cover?
Ask for six, and benchmark them against published producer specifications:
| Parameter | What it tells you | Premium shisha benchmark (per 2024 Indonesian producer specs) |
|---|---|---|
| Ash content | Residue after full burn; lower means a cleaner session | 1.8-2.5%, white to light-grey ash |
| Moisture | Ignition speed and mould risk in transit | <=5-6% |
| Fixed carbon | The fuel fraction that actually burns | >=75-80% |
| Volatile matter | Smoke and odour on ignition | <=15% |
| Calorific value | Heat output | 7,000-7,500 kcal/kg |
| Burn time | Session length per cube | 90-120 minutes |
Two external reference points put those numbers in context. Independent studies using the ASTM D1762 method have measured Indonesian coconut-shell charcoal at 2.4-2.9% ash with calorific values around 31,400-31,600 kJ/kg — broadly consistent with the premium band. And Indonesia’s own SNI standard caps briquette moisture and ash at 8% each, so a report showing 5% moisture and 2.3% ash is not merely compliant; it sits far inside the export-premium zone.
Shell origin shows up in the numbers too. According to Indonesian producer specifications published in 2024, Sumatra shells tend toward grey ash and roughly 90-minute burns, while Sulawesi shells produce whiter ash and burns of up to 110 minutes — worth knowing when two ROAs from the same supplier disagree slightly.
How long does testing take, and when should you book it?
Plan for one to two working weeks from sample handover to report, and confirm the exact turnaround when booking — some labs offer faster service for a surcharge, while others queue during peak export season. The scheduling rule: commission the analysis once the lot is packed and before the vessel is booked, leaving room to retest or reject without paying detention on a container already at port.
Cost is modest relative to the cargo. A six-parameter analysis is a rounding error against a container of premium briquettes worth well over USD 20,000 at 2026 FOB rates (premium grade trades at USD 1,250-1,500/MT) — non-optional insurance, not an expense to trim.
How does an ROA differ from a COA and an SHT?
Three documents, three jobs — and buyers routinely conflate them:
| Document | What it is | Who relies on it |
|---|---|---|
| ROA (Result of Analysis) | Raw laboratory report for one identified sample: measured values, methods, test date, lab stamp | Buyer and supplier, for grade verification and disputes |
| COA (Certificate of Analysis) | Lot-referenced certificate issued per export batch, summarising tested parameters against the agreed specification | Buyer’s QC team, customs brokers, downstream customers |
| SHT (Self-Heating Test) report | Proof the cargo is not liable to spontaneous combustion under UN transport criteria | Shipping lines and cargo insurers, before accepting charcoal under HS code 4402.90 |
The sequence in a well-run export: the ROA verifies the lot, the COA formalises it for the batch, and the SHT report clears it for carriage — carriers and insurers ask for the SHT as standard practice as of 2026, and a booking can be refused without it. Whichever document you are reviewing, check the test date against the production date; a certificate that predates the lot it describes is describing something else.
Frequently Asked Questions
Can I get a result of analysis before committing to a full container order?
Yes. Ask the supplier to draw a sealed sample from current production and courier it either to a KAN-accredited Indonesian laboratory or to a lab in your own market. Pre-shipment sample testing is standard practice at the one-container MOQ of roughly 17.5-18 metric tons, and the modest fee is cheap insurance against an off-spec lot.
Who pays for the laboratory analysis — the buyer or the supplier?
Practice varies. Suppliers normally absorb routine per-lot testing because it underpins the grades they publish; buyers commission and pay for independent analysis when they want results the supplier does not control. A common first-order pattern: the buyer funds one independent test, then relies on the supplier’s per-batch certificates once the two sets of numbers align.
How do I verify that a result of analysis is genuine and matches my shipment?
Match the lot or batch number on the report to your packing list, confirm the test date falls after the production date, and check the laboratory’s accreditation number against the KAN registry. Reputable labs will confirm a report reference on request. Treat any report that predates the lot it claims to describe as a red flag.