The smeltery is a multiblock structure, and it requires a few different kinds of blocks. First of all, every part of the smeltery must be constructed out of seared blocks or the blocks listed below. The most common type of seared block is Seared Bricks, which is crafted out of 4 Seared Brick (can be obtained by smelting Grout). Another common building material for smelteries is Seared Glass, which allows for easy viewing of liquids within the smeltery.