Why does metal not stick to a graphite ingot mould?

Because the usual non-ferrous metals do not wet the graphite surface, so the interface never forms a bond. That allows demoulding without barrier coatings and yields a clean ingot face.

What surface finish is obtained on the ingot?

It depends on the cavity finish, the grade, and the pouring temperature. A fine-grain grade and a well-finished cavity reproduce the surface better; the actual result is validated on the first cast.

Can multi-cavity or special-format moulds be machined?

Yes. Multiple cavities, draft angles, filling channels, and identification marks are machined to drawing. It is worth defining the draft angle together with the format to ease extraction.

How many casts does an ingot mould last?

There is no general figure: it depends on the metal, pouring temperature, handling, and exposure to air between cycles. What can be defined is the grade and finish that slow cavity erosion.

Metallurgical applications

Foundry ingot molds

Graphite ingot molds for solidification and casting of ingots and cast shapes.

Request a quote

Solidification mould

Also known as: Graphite ingot moulds · Graphite ingot casting moulds · Graphite chill moulds · Ingot casting moulds

[ Technical summary ]

The ingot mould receives molten metal and defines the shape of the ingot as it solidifies. The cavity must extract heat evenly and release the part without sticking: if metal adheres, the ingot is marked and the mould is damaged on demoulding. Graphite is not wetted by the usual non-ferrous metals, conducts heat toward the wall, and holds the cavity dimension across casts, while machining to custom ingot formats.

[ Problem it solves ]

Solidify metal into a defined shape and release it cleanly, without sticking or marking, holding the cavity dimension cast after cast.

Operating conditions

Ingot casting
Controlled solidification
Mold release

When it is suitable

Ingots or shapes of non-ferrous metal are cast
The ingot finish must be clean and repeatable
Demoulding with a metal mould is problematic
The ingot format is proprietary rather than standard

When it may not be suitable

The contacting metal readily dissolves carbon and the alloy cannot tolerate it
The part sits in air at high temperature between casts without protection
Demoulding is done by striking the mould directly

Process challenges

Metal sticking
Cracking from thermal shock
Surface finish

Advantages

Favorable mold release
Dimensional stability
Custom cavity machining

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.

Molten metal or alloy in contactDecisive
Operating temperatureDecisive
Heat-extraction rateDecisive
Geometry and tolerancesDecisive
Thermal shock severityDecisive
Surface finish required on the partRelevant
Thermal and duty cyclingRelevant

[ Required material properties ]

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

Critical properties

Thermal shock resistance
Non-wetting by molten metal
Thermal conductivity
Dimensional stability

Secondary properties

Grain size
Machinability
Bulk density

[ Related ]

[ Frequently asked questions ]

View all FAQs

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

[ Quote ]

Need the right specification—not just material?

Tell us your application. Engineering response in under 24 hours.

Request a quote Talk to an advisor