Graphite petroleum coke (GPC) is a high-purity carbon material used as a recarburizer in steelmaking, foundry, and as a raw material for electrodes and anodes. While carbon content and sulfur levels get most of the attention, particle size directly determines how efficiently your process runs.
The Science in One Sentence
Fine particles dissolve fast but oxidize easily. Coarse particles resist oxidation but dissolve slowly. The right size balances speed and yield.
Particle Size Guide
| Size | Best For | Why |
| < 0.5 mm (fine powder) | Plastics, rubber, battery anode precursors | High surface area for conductivity and reactivity |
| 0.5 – 5 mm (small granules) | Foundry recarburizing, gray and ductile iron | Optimal balance: ~90% carbon absorption, even dispersion |
| 5 – 25 mm (coarse granules) | Electrode and carbon product manufacturing | Structural strength, high density, 20-30% higher compressive strength |
One Rule of Thumb
Match particle size to your furnace capacity:
Furnace ≤ 1 ton → 0.5–2.5 mm
1–3 tons → 2.5–5 mm
3–10 tons → 5–20 mm
The Cost of Getting It Wrong
Using the wrong size can drop carbon yield from 90% to 60%, increase slag waste, and weaken final product strength. A 20-30% efficiency loss is common.
The Bottom Line
Specifying the right particle size is not a detail - it's a performance lever. We offer custom sizing services to meet your specific processing requirements.
[Contact us for a tailored GPC sample matched to your furnace specifications.]
