Charcoal powder has no natural stickiness, so every briquette needs a binder. The right choice depends on cost, availability and what your customers care about: low smoke, low ash or low price. Here are the options most small producers consider.

Starch (cassava, maize or wheat)

Starch is the most widely used binder. You cook it with water into a thick paste, then mix it with charcoal dust.

• Pros: burns relatively cleanly, widely available, produces firm briquettes when dried properly.
• Cons: needs cooking, adds a small cost, and briquettes must be dried well to avoid mould.

Clay or soil

Some producers use clay-rich soil because it is cheap and close at hand.

• Pros: very low cost.
• Cons: adds ash and reduces the heat value, so briquettes burn less hot and leave more residue.

Molasses or sugar-based binders

Molasses is sticky and sometimes available cheaply near sugar factories.

• Pros: strong binding when mixed correctly.
• Cons: supply is local, it can attract insects, and some mixtures give off more smoke or odour.

Waste paper pulp

Soaked and mashed paper acts as a binder and uses a waste material.

• Pros: inexpensive, recycles waste.
• Cons: briquettes can be weaker and smokier. Avoid glossy or printed paper that may contain chemicals.

How to choose

1. Make small batches with each candidate binder, using the same charcoal, and keep notes on quantities.
2. Dry them under the same conditions.
3. Compare hardness, how they light, smoke, ash left and burn time.
4. Calculate cost per kilogram of finished briquettes, including your time.

Keep it small

Binder should be only a modest share of the mix. Too much binder raises cost and smoke, and too little makes briquettes crumble. Trial batches show the balance for your own charcoal.

Related guides

For the full process, see how to make charcoal briquettes from agricultural waste. If you are thinking about a business, continue with turning charcoal briquettes into income.

• binder
• charcoal briquettes
• starch