Factorio Forums

Chemical Plant Catalysts.
Require modules to make, cheap chemical additions that can be socketed into chemical plants and oil refineries to act as normal modules (producivity, efficiency and speed).
The difference to mechanical modules are there are more slots for them, and also they are much cheaper to make, some are raw prodcuts. catalysts do break down very slowly over time, very slowly. however they very efficiently facilitate reactions and are a good thing to have in factories. they could be made of things we dont normally make, or even new ores like vanadium or platinum.

You're suggesting, that there are item-slots, which use the inserted item (module or whatever) over the run-time.
Remembers me to using coal in the furnaces.
...

Well, if you mean that: This is already existing, but I think it works only for fuel-items like coal, wood...
But I'm not sure. Maybe someone, who knows how the assembly machine/furnace can be configured?