+Clinker is a nodular material, typically 3-25 mm in diameter, produced by heating [Limestone](/wiki/limestone) and other minerals to incipient fusion in a [Rotary Kiln](/wiki/rotary_kiln). It forms the key intermediate product in the manufacture of [Portland Cement](/wiki/portland_cement), ground down with gypsum and other additives.
+## See also
+- [Cement](/wiki/cement)
+- [Gypsum](/wiki/gypsum)
+- [Concrete](/wiki/concrete)
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