Product Overview

Metallurgical coke is a porous, high‑carbon solid produced by heating low‑volatile bituminous coal in the absence of air. The resulting material consists primarily of fixed carbon with a structured macro‑porosity that promotes uniform combustion.

For open‑fire use the coke is sized to provide a consistent burn rate, high calorific value, and low volatile emissions, making it preferable to wood or charcoal in applications where steady heat and minimal smoke are required.

Typical Physical Properties

Values are indicative; actual properties vary with source coal and coking conditions. Material test reports are available on request.

Why Coke Suits Open‑Fire Applications

Open fires require a fuel that ignites readily, sustains a steady flame, and produces minimal particulate emissions. Coke’s high fixed‑carbon content yields a high calorific value (approximately 28‑32 MJ/kg) while its low volatile matter reduces smoke and spark formation.

The macro‑porous structure allows oxygen to diffuse uniformly through the fuel bed, preventing localized hot spots that can cause uneven burning or flare‑ups. Compared with wood, coke delivers a longer burn time per kilogram, reducing refuel frequency in fire pits, brazier rings, and low‑capacity industrial furnaces.

Additionally, the low sulphur and ash contents limit corrosive by‑products and simplify ash disposal, which is advantageous for both residential and semi‑industrial settings where cleaning frequency impacts operating cost.

Manufacturing Considerations

The coke is produced in by‑product recovery ovens where coal is heated to approximately 1000‑1100 °C under an inert atmosphere. The driving off of volatiles leaves a solid carbon matrix that is subsequently crushed and screened to the required size bands.

Quality control focuses on three key parameters: fixed carbon content (via proximate analysis), size distribution (via sieve analysis), and moisture content (via oven‑dry method). Each batch is sampled before packaging to verify conformance to the agreed specification.

Because coke is a commodity material, tolerances are expressed as ranges rather than fixed points. Typical acceptance criteria are ±2 % for fixed carbon, ±1 % for moisture, and size‑grade compliance within ±5 % of the target sieve percentages.

Quality Assurance

Every lot undergoes a full proximate analysis (fixed carbon, volatile matter, ash, moisture) and a sulfur determination. Results are recorded in a batch‑specific test certificate that accompanies the shipment.

Size verification is performed using a calibrated vibratory sieve shaker; the cumulative percentage passing each sieve is compared to the graded specification. Any deviation outside the agreed tolerance triggers re‑screening or rejection.

Visual inspection checks for foreign material, excessive fines, or signs of premature oxidation (surface discoloration). These non‑destructive checks are carried out at the packaging line before final sealing.

Packaging & Storage

The product is packed in multi‑wall polyethylene‑lined polypropylene bags, each bag containing 25 kg of coke. Bags are sealed with a heat‑seal lip to prevent moisture ingress during transit and storage.

For bulk orders, coke can be supplied on pallets (40 bags per pallet, ~1 tonne) or in bulk‑liner bags (500 kg to 1 tonne capacity) with a protective outer wrap. All packaging materials are UV‑stabilised to withstand outdoor storage.

Storage recommendations: keep under cover, on a dry, level surface, and away from direct sources of water. Under these conditions the product retains its specified properties for at least 12 months.

Ordering Information & Lead Time

Minimum order quantity is one pallet (40 bags, 1 tonne). Smaller quantities can be arranged through regional distributors; please consult the sales team for available options.

Standard production lead time is 10‑15 working days after receipt of a confirmed purchase order, subject to raw‑coal availability and furnace capacity. Express processing (5‑7 days) may be offered for an additional fee.

Shipping is performed via road freight with palletised or bulk‑liner configurations. Export shipments are prepared in accordance with ISPM‑15 wood‑packing regulations and include a moisture‑barrier liner inside the container.

Frequently Asked Questions

Can the size be customised?

Yes. While the standard graded range is 20‑75 mm, alternative size bands (e.g., 10‑30 mm for rapid ignition or 50‑100 mm for extended burn) can be produced upon request, subject to minimum lot size.

What information is required for a quotation?

To generate a quote we need the desired quantity (in tonnes or bags), preferred size grade, delivery location, and any specific packaging (e.g., bulk‑liner vs. bagged). Providing the required delivery date helps us confirm lead time.

How is quality verified before shipment?

Each lot is accompanied by a certificate of analysis showing proximate analysis, sulfur, and size distribution results. Random samples are retained for three months for potential retesting.

What are the typical payment terms?

Standard terms are 30 days net from invoice date. Alternative arrangements (e.g., letter of credit, advance payment) can be discussed based on order volume and customer credit profile.

Ready to Discuss Your Requirements?

If you need a fuel that delivers steady heat, low emissions, and predictable consumption for open‑fire installations, contact our technical sales team to arrange a sample or receive a detailed quotation.