(III) Loam Sand:
Loam sand contains many ingredients, like fine sand particles, finely ground refractories, clay, graphite and fiber reinforcements.
In many cases, the clay content may be of the order of 50% or more.
When mixed with water, the materials mix to a consistency resembling mortar and become hard after drying.
Big molds for casting are made of brick framework lined with loam sand and dried.
Sweeps etc are used for making big castings like big bells by using loam sand.