GPC vs calcined petroleum coke vs semi-graphitized

Graphitized petroleum coke (GPC) is petroleum coke treated at graphitization temperatures (Jiushun cites ~2,800 °C). Calcined petroleum coke (CPC) is calcined, not fully graphitized. Semi-graphitized material sits between and must be bought against written indicators, not a marketing label alone. Buyers may also say carbon raiser, carbon additive, carburizer or recarburiser for the same purchase class.

Why buyers mix the three names

Suppliers and traders sometimes use “carbon raiser”, “recarburizer” and “GPC” loosely. For a purchase order, the chemistry and size matter more than the trade nickname.

Practical differences for enquiry text

1. GPC (graphitized) — use when you want the published Jiushun ZW01–ZW04 sheet (S≤0.05%, N 100–300 ppm by grade). See specifications.
2. CPC (calcined) — different process route; do not assume ZW sheet numbers apply.
3. Semi-graphitized — Jiushun quotes only after you send target F.C., S, ash, V.M., moisture, N and size. See semi-graphitized.

How to avoid a mismatched shipment

Write the indicator limits on the PO and require the same fields on the COA. If the supplier cannot put numbers on paper, do not treat the trade name as a specification.