Is graphite suitable for blown-glass molds?

Yes. Isostatic graphite provides surface finish, thermal conductivity, and dimensional stability for molds, tongs, and float-glass fenders.

Why does graphite not mark hot glass?

Because it is not wetted by the glass and because its contact draws heat less abruptly than metal. Marking on hot glass usually comes from both sticking and local chilling, and graphite reduces both effects.

Complete tongs or graphite inserts?

Inserts are usual when a metal tool already exists: only the contacting part is replaced. Complete tongs are justified when the geometry is proprietary or when the whole tool works close to the hot part.

Are jaws machined to the shape of the part?

Yes. The gripping face is machined to the glass profile to spread pressure, which reduces marking and the risk of cracking at the contact point.

Graphite tongs and holders for hot glass handling

Glass applications

Hot-glass tongs

They facilitate the transport and handling of glass at high temperatures.

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Hot glass handling tool

Also known as: Graphite tongs for glass · Graphite jaws for hot glass · Graphite grippers · Graphite tong inserts

[ Technical summary ]

Graphite tongs, jaws, and inserts grip the glass part while it is still hot and its surface is sensitive to any contact. Graphite allows gripping without sticking, and by drawing less heat at the contact point than metal it avoids the local shock that cracks the part. It is used in the hot end of container lines, in technical glass, and in the workshop — as complete tongs or as inserts replaced on a metal tool.

Carbon/graphite tongs, inserts and holders for take-out and hot-ware handling. The material reduces marking, thermal stress and the need for lubricants.

ESGRAF supplies parts to print for container lines. Share tong type, machine and cycle.

[ Problem it solves ]

Grip hot glass without marking it or sticking to its surface, and without causing local chilling that cracks the part at the gripping point.

Operating conditions

High temperature
Contact with molten metal or glass

When it is suitable

The part is handled while still hot and its surface is sensitive
Metal tools mark or over-chill the gripping point
The jaw must match the shape of the part
Only the insert, not the whole tool, is to be replaced

When it may not be suitable

The part is left in hot air during stoppages, with no protection
Gripping requires high clamping force on a small section
The tool takes knocks against the machine or the floor

Process challenges

Adhesion / sticking
Thermal shock
Surface wear

Advantages

Low adhesion
Thermal stability
Custom 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.

Operating temperatureDecisive
Contact forceDecisive
Geometry and tolerancesDecisive
Surface finish required on the partRelevant
Machine cycle rateRelevant
Heat-extraction rateRelevant

[ Required material properties ]

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

Critical properties

Thermal shock resistance
Thermal conductivity
Wear resistance
Non-wetting by molten metal

Secondary properties

Compressive strength
Machinability
Grain size

[ Related ]

[ Frequently asked questions ]

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

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