Step 6: Shell Knock Off

Once cool, the shell material is removed from the metal. This is typically done via mechanical means:

• Hammer
• High Pressure Water Blast
• Vibratory Table

Shell removal can also be accomplished chemically, using a heated caustic solution of either potassium hydroxide or sodium hydroxide, but this approach is being phased out due to environmental and health concerns.

Next... Step 7: Cut Off

Back... What Is Investment Casting

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