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Factory

How Our Coconut Shell Charcoal Is Made

The full Mulia Charcoal production process — from coconut shell to a finished shisha briquette — carbonized mostly at our own plant in Bitung and supplemented from vetted suppliers, then milled, bound with natural tapioca starch, pressed, dried and weathered at our Semarang factory.

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Authored by
Andri Dharmawan
Founder & Director
Fact-checked by
Teguh Pranomo
Quality Control Manager
Last updated
Reading time
5 min read

Every briquette we ship is pressed, dried, weathered and packed in-house, and most of the char in it is carbonized at our own plant in Bitung. This page is part of our coconut charcoal factory overview: the process stage by stage, with the temperatures and durations that matter.

Hydraulic presses compact coconut shell charcoal powder and tapioca binder into shape at high pressure.

Quick answer

How is coconut shell charcoal made?

Coconut shell charcoal is made in 7 stages: carbonize the shell into char, mill and sieve it, mix it with natural tapioca starch and water, press it, dry it for at least 36 hours, weather it, then check and pack it. We carbonize most of the char at our plant in Bitung; every later stage runs at our Semarang factory.

1. The process at a glance

7 stages take coconut shell from a raw byproduct to a finished briquette, across our two sites:

Bitung, North Sulawesi

  1. 1Carbonization

Semarang, Central Java

  1. 2Milling & sieving
  2. 3Mixing & binder
  3. 4Pressing & forming
  4. 5Drying
  5. 6Weathering
  6. 7Quality control & packing

Export

Tanjung Emas, Semarang (IDSRG)

Mulia Charcoal production runs across two sites: most of the char is carbonized at our plant in Bitung, North Sulawesi, and the 6 stages from milling & sieving to quality control & packing run in Semarang, Central Java, where containers load at Tanjung Emas port (IDSRG).

  1. Carbonize the shell ≈400–700°C

    Raw coconut shells are carbonized in our kilns, driving off volatiles and leaving high-fixed-carbon charcoal.

  2. Mill and sieve the char

    Carbonized shell is crushed and milled to a fine powder, then sieved to a controlled, uniform particle size.

  3. Mix with the binder

    Charcoal powder is blended with food-grade tapioca starch and water — no chemical accelerants — into a homogeneous paste.

  4. Press and form

    The paste is pressed and extruded into cubes, hexagonals, or fingers at high pressure for a dense, consistent briquette.

  5. Dry ≥36 h

    Formed briquettes are dried in temperature-controlled tunnels to a low, stable moisture content.

  6. Weather ≥14 days

    Briquettes are weathered under cover before packing — a dangerous-goods safety step under IMDG Special Provision 978.

  7. Check and pack

    Every batch passes our in-process quality checks and a burn/ash test before packing; a reference sample is retained.

The inputs are simple: coconut shell, and natural tapioca starch with water as the binder. Additives: none — no chemical additives or igniting agents.

Milled charcoal is mixed with tapioca binder, pressed or extruded, then cut, weathered and dried before packing.

2. Carbonization and pyrolysis

Carbonization heats coconut shells in a low-oxygen kiln to roughly 400–700°C, driving off moisture and volatile gases and leaving a hard char that is mostly fixed carbon.

Carbonization at 400–700°C drives off volatiles and leaves a hard, high-carbon char.

What carbonization level means

Pyrolysis: the chemistry

Definition

Pyrolysis is the thermal decomposition of organic material without flame. Inside the kiln it converts the shell's cellulose and lignin into carbon, releasing wood gas and leaving the char that becomes charcoal.

Freshly carbonized char is cooled before it is bagged, because hot charcoal exposed to air can catch fire again.

Pyrolysis, defined

3. Kiln operation at Bitung

We carbonize at our own plant in Bitung, North Sulawesi, at the shell source, not at the port. We run 8 carbonization ovens there, each carbonizing about 1.5 tons of shell per batch on a 24-hour cycle. The ovens run on gas and electric heat.

Carbonization ovens heat coconut shell with little oxygen, driving off moisture and volatiles to leave a hard, high-carbon char.

Kiln operation, defined

4. Binder and pressing

The milled char is mixed with natural tapioca starch and water into a paste, then pressed and extruded under high pressure into cubes, hexagonals, or fingers. Additives: none — no chemical additives or igniting agents.

Milled coconut shell charcoal is blended with food-grade tapioca binder in ribbon mixers to a consistent paste before pressing.

Tapioca binder, defined

5. Weathering

Important

Special Provision 978 of the IMDG Code requires charcoal to be weathered for at least 14 days after production before it is packed. Hapag-Lloyd, February 2025 (opens in new tab)

We weather every batch under cover for at least 14 days before loading. Weathering lets the reactive carbon surface oxidize and the material's self-heating tendency fall, which is why sea freight treats it as a dangerous-goods safety control.

Weathering lets freshly pressed briquettes equalize moisture with the air and lets the reactive carbon surface stabilize before packing.

Weathering, defined Why weathering is a shipping-safety step

6. In-process quality control

We retain a reference sample from every batch, so any later query can be traced back to the exact production run.

Carbonized shell is milled to a uniform charcoal powder and sieved for particle size, which controls briquette density and finish.

Every batch moves through our 6-stage in-process control framework:

  1. Raw shell intake

    Incoming coconut shell is inspected for moisture and contamination before carbonization.

  2. Carbonization control

    Kiln temperature and burn time are monitored to hold fixed carbon within target.

  3. Powder consistency

    Milled charcoal is sieved and checked for particle-size uniformity.

  4. Mix & density check

    Binder ratio and paste density are verified before pressing.

  5. In-line dimensional check

    Pressed briquettes are sampled for size, weight, and edge integrity.

  6. Finished-batch burn test

    Each batch undergoes a moisture reading and a burn/ash test; a reference sample is retained.

Each container ships with a batch Certificate of Analysis and a third-party laboratory report from Carsurin; the documentation side is covered under Quality. How we test and document every batch

7. Develop to spec

Tip

Have a target ash, density, or burn profile? We can develop a recipe toward your spec and confirm it by sample before a production run.

8. Isn't a trader with many suppliers more flexible than one factory?

Note

The strongest counterargument is real: a trading house that aggregates output from several workshops can quote almost any shape, grade, or volume on short notice, and can swap suppliers if one stumbles. A single factory's catalog and monthly ceiling are, by definition, finite.

That flexibility has a cost the buyer inherits: with multiple unnamed workshops feeding one shipment, ash, density, and burn time can drift from carton to carton, and there is no single party who can trace a complaint to the run that caused it.

Note

Our model trades breadth for traceability. Most of our char is carbonized in our own ovens at Bitung, every briquette is milled and pressed on our own lines, and a reference sample is retained from every batch after our 6-stage in-process framework, so a query months later maps to an exact production run. On volume, one 18-ton container is about 5% of our 350-ton monthly output, so one factory is not the bottleneck the trader model implies. For a buyer building a brand on repeat-order consistency, a documented single chain beats a flexible but unattributable one.

Frequently asked questions

How is coconut shell charcoal made?
In 7 stages: coconut shells are carbonized into char, the char is milled to a powder, mixed with natural tapioca starch, pressed into briquettes, then dried and weathered for at least 14 days before in-process QC and packing.
What is carbonization, and what is pyrolysis?
Carbonization is heating coconut shell in a low-oxygen kiln (roughly 400–700°C) until it becomes char that is mostly fixed carbon. Pyrolysis is the underlying chemistry — thermal decomposition without flame that converts the shell into carbon.
Why are the briquettes weathered, and for how long?
At least 14 days at our factory. IMDG Special Provision 978 requires at least 14 days after production. Weathering lets the reactive carbon surface oxidize so the self-heating tendency falls — a dangerous-goods safety control for sea freight.
What binder do you use?
We bind the charcoal with natural tapioca starch and water. Additives: none — no chemical additives or igniting agents.
What is your in-process quality-control process?
Every batch is checked in process before packing, and a reference sample is retained from every batch. The checks follow our 6-stage framework: raw-shell intake, carbonization control, powder consistency, mix and density, in-line dimensions, and a finished-batch burn and ash test.
How do you keep quality consistent batch to batch?
Every batch runs the same sequence on our own lines: milled powder is sieved to a uniform particle size, and a reference sample is retained from every batch. Each container's COA and Carsurin laboratory report documents the result; see Quality.

Sources

  1. New safety rules for charcoal shipments — What you need to know! (customer advisory on IMDG Special Provision 978) (opens in new tab), Hapag-Lloyd, February 2025 — accessed

Want the process records for your order?

We send the production sequence, the batch COA and the weathering record with a written quote. Tell us the grade, the shape and your destination port.

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