Raw Refractory bricks need to be baked at 850°C for 27 fuel ticks to turn into Fired Refractory Bricks. Those can then be used to craft their tier specific brick blocks and brick grating blocks. The different tiers of refractory bricks have different heat resistances. Tier 1 has a heat resistance of 90%, Tier 2 has 95%, and Tier 3 reaches 100%. All refractory brick blocks have a chance to receive damage in each smelting process. Each tier 1 brick block has a 1 in 10 chance to break, while it is 1 in 20 for tier 2. Tier 3 refractory bricks have a low 1 in 1000 chance to break. Damaged refractory brick blocks can be broken to return some of their materials back, similar to a broken bloomery. Grate blocks do not get damaged at the moment, which means there is
not sense in making them out of higher tier bricks.