How to Properly Use graphite molds
This is a simple guide on proper use and techniques for graphite molds to extend life and produce excellent pours.
1
Inspect and Clean the Mold
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Inspect all mold surfaces before each pour
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Remove graphite dust or debris using compressed air
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Confirm the mold is completely dry
Moisture trapped in graphite can cause cracking or violent metal spatter when molten metal is poured.
2
Preheat the Mold (Critical)
Target temperature:
200–400°F (95–200°C)
Why preheating matters:
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Removes residual moisture
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Prevents thermal shock
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Improves metal flow into fine details
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Reduces surface defects
Acceptable preheating methods:
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Hot plate
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Kiln
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Furnace edge
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Even torch heating across the entire mold
Avoid concentrating heat in one area.
3
Melt and Pour the Metal
Best practices:
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Fully melt the metal and slightly superheat it
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Skim slag or dross before pouring
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Pour in one smooth, continuous motion
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Fill the cavity completely without stopping
Avoid splashing or interrupted pours, which can cause defects.
4
Cooling and Release
Cooling rules:
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Allow the metal to solidify naturally
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Typical cooling time is seconds to minutes
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Gently tip or tap the mold to release the casting
Do not water-quench or force cool graphite molds.