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This page is about the Slag from Thermal Expansion 3. For other uses, see Slag.

ModThermal Expansion 3

Slag is an item added by Thermal Expansion 3. It is a byproduct of smelting ore dust with Sand in an Induction Smelter. Smelting ore blocks with Sand yields a chance to drop Rich Slag. Rich Slag can be combined with ore blocks to triple the ore output and to create a secondary byproduct of regular Slag. Slag can be smelted in a furnace to create Rockwool.


  • Smelting any ore dust with sand has a 25% chance of producing Slag.
  • Smelting Gold Ore with sand has a 10% chance of producing Rich Slag, all other ores have a 5% chance.
  • Smelting any ore with Rich Slag has a 75% chance of producing Slag.