Fixed carbon helps buyers estimate the useful carbon level in GPC, but it should not be read alone. A practical GPC inquiry should also include sulfur content, ash, moisture, volatile matter, particle size, application, quantity, packing and destination so the supplier can match an available batch.
Definition
Fixed carbon is commonly used to describe the carbon remaining after moisture, volatile matter and ash are considered. GPC means Graphitized Petroleum Coke. Semi graphitized petroleum coke and fully graphitized petroleum coke are treated as part of the GPC product family, with supply confirmed by batch specifications.
Product and supply reference
Fixed Carbon and Related Specification Fields
| Specification field | What it means | How buyers should use it |
|---|---|---|
| Fixed carbon | Useful carbon level in the material | Screens whether a GPC batch fits the target application |
| Sulfur content | Sulfur control level | Important for foundry, steelmaking and metallurgy requirements |
| Ash | Inorganic impurity level | Helps evaluate impurity input and batch consistency |
| Moisture and volatile matter | Dryness and processing condition | Affects storage, feeding, packing and use stability |
| Particle size | Granule or powder size range | Affects feeding, absorption, screening loss, dust and logistics |
Inquiry Checklist
- Product name: GPC / Graphitized Petroleum Coke
- Target fixed carbon plus sulfur content, ash, moisture and volatile matter limits
- Particle size, application and whether batch COA is required
- Order quantity, packing method, destination and expected delivery time
- Whether samples, photos or loading documents are needed
Procurement Context
Turn this knowledge into a specification-based inquiry
For procurement, this topic should eventually be translated into product route, specification fields, quantity, packing and destination so the buyer can send an executable RFQ.
FAQ
Is higher fixed carbon always better for GPC?
Not always. Fixed carbon is important, but sulfur content, ash, moisture, volatile matter, particle size and application decide whether a batch is actually suitable.
Can buyers request a GPC quote by fixed carbon only?
Fixed carbon alone is not enough for a workable quote. Suppliers also need sulfur content, particle size, quantity, packing, destination and application.
How is GPC different from CPC when reading fixed carbon?
GPC is Graphitized Petroleum Coke, while CPC is Calcined Petroleum Coke. Both may use fixed carbon as a specification field, but the process route and common applications differ.
Why do ash and volatile matter appear with fixed carbon?
These fields help explain the material balance and processing condition. They should be reviewed together rather than treating fixed carbon as the only quality signal.
What if the buyer does not have a test report yet?
The buyer can send target specifications, application, particle size, quantity and destination first. The supplier can then discuss available batches, samples, photos or COA.
