Refractory Lining

A thicker brick wall that you fit inside a Crucible or a furnace (see Furnaces). It makes the crucible heat up and cool down more slowly. It does not make it any hotter.

Crafting

Four Bricks in a square.

B B
B B

Fitting it

Right-click a Small or Large Crucible, or a furnace, with the lining. It goes inside, so it doesn't matter which face you click. Each takes one lining. Breaking it gives the lining back.

What it actually does

A lined crucible behaves like a heavier crucible:

• Slower to heat up. It takes longer (and more fuel) to reach temperature.
• Slower to cool down. Pull the fire away and it holds its heat much longer.
• Steadier. Short flickers in the fire barely show up in the crucible's temperature. That helps a lot with processes that go wrong if the temperature swings or climbs too fast.
• Slower to respond to a thermostat. A Bimetallic Strip or Controller driving it will overshoot a bit more, because the crucible keeps rising after the heat is cut.

What it won't do is raise the crucible's final temperature. A crucible still settles just under the temperature of the fire beneath it, lined or not. To get hotter you need a hotter fire. See Powered Bellows.

Small vs. large

On a Small Crucible the difference is dramatic: it roughly doubles how sluggish it is, which puts it partway to a Large Crucible's steadiness without the size. On a Large Crucible, which is already very heavy, you'll barely notice it.

When to use it

• Yes: long holds at a steady temperature, or jobs that are ruined by heating too fast.
• No: jobs where you need the crucible to get hot quickly, or to cool down fast between batches. Leave the small crucible bare for those.