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.

What is the advantage of graphite as a pigment?

Its stability. It does not degrade chemically or lose tone with heat, which matters in formulations exposed to temperature or aggressive media where an organic colourant does not hold.

Does it reach the intensity of a specialized black pigment?

Not always. Hiding power depends on particle size and dispersion, and for maximum intensity there are purpose-formulated pigments. Graphite is chosen when stability outweighs peak tone.

By particle size distribution, purity, and ash content, plus the presentation. Those figures allow batches to be compared and the colour result repeated.

Graphite used as a black pigmentation additive in an industrial formulation

Additives / Formulation

Pigment graphite additive

Graphite powders play a fundamental role as additives in a wide range of chemical processes and coating production.

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Pigment and colouring filler

Also known as: Graphite as a black pigment · Graphite colouring filler · Carbon pigment for formulations · Powdered graphite for pigmentation

[ Technical summary ]

As a pigment, graphite provides a stable black that does not degrade chemically or lose tone with heat, unlike many organic colourants. It is used in paints, plastics, and industrial formulations where that stability matters more than maximum colour intensity. Hiding power and shade depend on particle size and dispersion, so the result is defined on the specific formulation.

[ Problem it solves ]

Provide stable black colouring in formulations exposed to heat or aggressive media, where an organic colourant would lose tone or degrade.

Operating conditions

Pigmentation of paints and coatings
Coloring of plastics and compounds
Industrial formulation

When it is suitable

The colour must stay stable under temperature or the medium
The formulation accepts a solid powder filler
A chemically inert pigment is required
The additive can be dispersed homogeneously in the matrix

When it may not be suitable

The formulation requires a light colour or transparency
The effect cannot be validated with tests on the actual formulation
The application demands the black intensity only a specialized pigment reaches

Process challenges

Uneven pigment dispersion
Color stability
Compatibility with the matrix

Advantages

Stable, chemically inert black
Good covering power depending on particle size
Suitable for multiple matrices

Limitations

May require adequate mechanical dispersion
Does not add colors other than black/gray
Dose affects viscosity and mechanical properties

[ Critical selection variables ]

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

Base matrix or resinDecisive
Particle sizeDecisive
Dosage and application frequencyDecisive
Carrier or formulation baseRelevant
Required purity and allowable contaminationRelevant

[ Required material properties ]

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

Critical properties

Thermal stability
Particle size distribution
Dispersibility
Chemical resistance

Secondary properties

Purity
Ash content

[ Related ]

[ Frequently asked questions ]

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

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