A per-batch Certificate of Analysis (COA) is an independent lab report issued for each coconut charcoal briquette export lot, measuring ash, moisture, calorific value, fixed carbon, volatile matter and burn time. As of 2026, every lot brokered through this desk ships with one from an Indonesian-accredited laboratory — request a sample COA and quote below.
A spec sheet says what a producer intends to make. A COA says what your batch actually measured. Indonesia is the dominant global origin for coconut-shell charcoal, so origin is settled — the real question is whether a supplier can prove, lot by lot, that the cubes in your container match the brochure.
What Does a Per-Batch COA Actually Cover?
Six parameters, each tested on samples drawn from your production lot — not from a showroom cube.
| Parameter | Premium shisha spec (as of 2026) | What it tells you |
|---|---|---|
| Ash content | 1.8–2.5% (2.2–2.5% is the most-ordered band) | Residue after burning; white or light-grey ash signals clean shell stock |
| Moisture | ≤5–6% | High moisture means slow ignition and mould risk in transit |
| Calorific value | 7,000–7,500 kcal/kg | Heat output per cube |
| Fixed carbon | ≥75–80% | Burn stability and length |
| Volatile matter | ≤15% | Sparking, smell and flavour taint when high |
| Burn time | 90–120 minutes per cube, ignition under 5 minutes | The session length a lounge can actually run |
Two reference points give those numbers context. Independent studies using the ASTM D1762 method measured Indonesian coconut-shell charcoal at 2.4–2.9% ash, with calorific values around 31,400–31,600 kJ/kg. Indonesia’s SNI standard caps briquette moisture and ash at 8% each — so a COA showing 2.2% ash runs far inside the national ceiling.
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; Sulawesi shells give whiter ash and up to 110 minutes.
How Do You Read a Coconut Charcoal COA?
Take a real certificate top to bottom. Every line has a job:
- Lab identity. Name, address and accreditation reference of an independent Indonesian-accredited lab. A “COA” typed on the seller’s own letterhead is a brochure.
- Lot identification. A batch code matching your proforma invoice and, once assigned, your container number. No lot code, no traceability.
- Test dates. Sampling and test-completion dates inside your lot’s production window — typically days to a few weeks before stuffing.
- Parameter table with methods. Each result should name its test method (proximate analysis to the ASTM D1762 approach is common), not just a bare number.
- Results against limits. Measured values beside the agreed specification, so a miss is visible at a glance.
- Stamp and signatory. A named analyst or lab manager, signed and stamped. Check both test dates and lab stamp — standard diligence as of 2026.
What Are the Red Flags on a Supplier’s COA?
- Stale test dates. A certificate dated months before your batch was pressed describes someone else’s charcoal.
- No lab stamp or named signatory. Unsigned PDFs are decoration.
- No lot number. A COA that cannot be tied to your container proves nothing about it.
- Recycled numbers. Identical results across “different” batches suggest one old report on career-long duty.
- Too-good physics. Claims like 0.5% ash sit outside published Indonesian producer ranges.
- Missing method references. A result without a stated test method cannot be reproduced or challenged.
COA vs ROA vs SHT: Which Document Proves What?
| Document | What it proves | Who asks for it |
|---|---|---|
| COA — Certificate of Analysis | Measured quality of your specific export lot: ash, moisture, calorific value, fixed carbon, volatile matter, burn time | Buyers, importers, private-label brands |
| ROA — Report of Analysis | A one-off lab result on a product sample; useful background, but not tied to your lot | Marketing decks, product registration files |
| SHT — Self-Heating Test | The cargo is not liable to self-heat in transit — a safety document, not a quality one | Carriers and cargo insurers, before accepting charcoal |
Sellers sometimes hand over an ROA and call it a COA. The difference is the lot code: an ROA describes a sample from the past; a per-batch COA describes the pallets going into your container.
What Do COA-Backed Grades Cost FOB?
As of 2026, subject to change — only a written quotation binds:
| Grade | Typical spec anchor | FOB Indonesian port |
|---|---|---|
| Premium shisha (ash ≤2.5%) | 90–120 min burn, fixed carbon ≥75–80% | USD 1,250–1,500 / MT |
| Standard shisha (ash 2.5–3.0%) | Reliable lounge grade | USD 1,000–1,250 / MT |
| BBQ coconut–hardwood blends | Grade A (70/30) through Grade C (30/70) | USD 700–1,000 / MT |
| Private-label packaging | Printed inner boxes, master cartons | Adds up to USD 250 / MT |
Published exporter quotes anchor these bands: USD 1,340/MT FOB for a specified briquette, USD 700/MT FOB for a blend testing 7% moisture, 70% fixed carbon, 7,200 kcal/kg and an 8-hour burn, and USD 1,000/MT EXW (2024) for 100% coconut shisha briquettes at a 17.5-ton minimum. Site-wide MOQ is one 20ft container, roughly 17.5–18 MT.
How Does a COA-Backed Order Work?
- Send your spec. Use the request form on this page — target grade, volume, destination port. Contact is form-only; nobody cold-calls you.
- Receive a sample COA and quote. Within 24 business hours, the Coconut Charcoal Export desk returns a recent sample COA from a comparable lot plus an indicative FOB quote.
- Approve and reserve production. Your order goes to a verified producer from an audited pool. We broker and verify — we do not own the kilns.
- Pre-shipment testing. Samples from your lot go to an Indonesian-accredited laboratory; your per-batch COA is issued before container stuffing, with packaging to export packaging that meets buyer and destination requirements.
- Documents and loading. The COA travels under HS code 4402.90 with the Certificate of Origin (Form A or Form D by destination), PEB export declaration, commercial invoice, packing list, fumigation certificate and SHT report. Loading runs from Tanjung Priok, Tanjung Perak or Semarang; Benoa serves Bali loadings and buyer inspection visits.
> Request a sample COA + FOB quote. Send your grade, volume and destination through the form — the Coconut Charcoal Export desk replies within 24 business hours with a recent sample COA and dated pricing. Prefer chat? the quote form. All figures as of 2026, subject to change; only a written quotation binds.
Frequently Asked Questions
How do I verify a coconut charcoal briquette COA is genuine?
Match the lot number on the COA to your proforma invoice and container documents, then contact the issuing laboratory directly using contact details you source independently — not those printed on the certificate. A genuine per-batch COA carries a test date inside the production window, a named signatory, a lab stamp, and stated test methods such as ASTM D1762.
How recent should the test date on a per-batch COA be?
Sampling and testing should fall within your lot’s production window — typically days to a few weeks before container stuffing, never months before. A certificate dated before your batch existed describes someone else’s charcoal. As of 2026, per-lot testing ahead of stuffing is standard practice among serious Indonesian exporters, so a fresh date is reasonable to demand.
Is a COA the same as a Self-Heating Test report?
No. The COA measures quality: ash, moisture, calorific value, fixed carbon, volatile matter and burn time for your lot. The SHT report addresses safety, proving the cargo is not liable to self-heat in transit — carriers and insurers ask for it before accepting charcoal. A compliant export lot ships with both, plus origin and fumigation certificates.
Does every container get its own COA?
Each export lot receives its own COA, and one 20ft container — roughly 17.5–18 metric tons, the site-wide minimum order — typically equals one lot. Multi-container orders drawn from a single production batch may share one certificate, but every container should still trace back to that batch through the packing list and lot codes.
Which parameters matter most on a shisha-grade COA?
Ash content first: premium shisha grade runs 1.8–2.5%, and 2.2–2.5% is the most-ordered band according to Indonesian producer specifications published in 2024. Then moisture at or below 5–6%, fixed carbon of 75–80% or higher, and burn time of 90–120 minutes per cube. Calorific value of 7,000–7,500 kcal/kg confirms heat output.