Which graphite powder is used as a foundry additive?

Depending on recarburization, slag, or conductivity needs we recommend coke, synthetic, or amorphous graphite in controlled particle sizes. Grades also exist for mortars, pigmentation, and drilling muds.

Why is graphite added in foundry work?

It is used as a carbon source to adjust bath composition and as a component of moulding sands, coatings, and dispersions. These are two distinct roles, and each imposes its own particle size and purity.

Which graphite is appropriate: natural flake or amorphous?

It depends on the role. Flake graphite is used where lubricity and non-wetting behaviour at the mould surface matter; amorphous is chosen on cost when the carbon contribution is what counts. Selection is made on carbon content and particle size.

How is the product specified?

By carbon content, ash, moisture, and particle size distribution, plus the presentation. Those are the figures that let batches be compared and results repeated in the plant.

Graphite/carbon additive for foundry processes

Additives / Formulation

Foundry additive

Graphite or high-carbon material is used as an additive in smelting and steelmaking processes to modify molten metal behavior.

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Carbonaceous process additive

Also known as: Graphite recarburizer · Carbon additive for foundries · Graphite for moulding sands and coatings · Graphite powder for foundry use

[ Technical summary ]

In foundries, graphite is used as powder or granulate with two distinct roles: as a carbon source that adjusts the composition of the bath, and as a component of moulding sands, coatings, and dispersions, where its lubricity and non-wetting character improve release and part finish. Selection is by particle size, carbon and ash content, and by how it is incorporated into the process.

[ Problem it solves ]

Add carbon to the process in a controlled way — to the bath or to the mould surface — without introducing impurities that alter the composition or finish of the casting.

Operating conditions

Foundry / casting
Formulation

When it is suitable

The bath composition requires a carbon adjustment
The moulding sand or coating needs a carbonaceous component
Release and surface finish of the casting must improve
The process accepts powder or granulate addition

When it may not be suitable

The alloy cannot tolerate variation in carbon content
The process requires ash or sulphur levels below what can be verified
Dust handling cannot be controlled at the point of application

Process challenges

Wetting
Casting quality

Advantages

Carbon pickup
Mold-release improvement depending on use

Limitations

Wear from erosion and thermal shock
Possible metal contamination if the grade is unsuitable
Service life depends on cycles and metal flow

[ Critical selection variables ]

These variables define the grade and the geometry. Actual values are confirmed against the grade datasheet.

Particle sizeDecisive
Required purity and allowable contaminationDecisive
Dosage and application frequencyDecisive
Application methodDecisive
Molten metal or alloy in contactRelevant
Operating temperatureRelevant

[ Required material properties ]

Properties that guide selection. Numerical values come from each grade's datasheet.

Critical properties

Non-wetting by molten metal
Purity
Ash content
Particle size distribution

Secondary properties

Dispersibility
Thermal stability

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[ Frequently asked questions ]

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Technical content reviewed by ESGRAF — Last reviewed: September 8, 2026

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