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Clinker
Clinker is a waste byproduct of smelting ore in a Furnace. You will receive it, along with the finished metal, at the end of the smelting process. Largely worthless, it is used in conjunction with bauxite and gypsum in a Clinker Vat to produce cement. You will probably generate far more clinker in the process of smelting metals than you will ever need for cement production.
Only if you possess the Masonry tech will a furnace produce clinker for you. (Presumably, characters without the tech don't recognize its potential use and automatically discard it.)
See Pollution for related info.