What is lightweight castable

Castables with a bulk density less than 1.5 specific gravity are lightweight castable refractory, mainly for thermal insulation.

The raw materials of the lightweight castable refractory are aggregates and powders that are added in proportion with a density and light weight, and the binder is also combined with high-alumina cement. There is also a combination of water glass and phosphoric acid, but the binder of the lightweight castable is large, and the proportion of water added to the construction is also larger than that of the heavy castable.

Lightweight castable  refractory are characterized by low density, light weight, low thermal conductivity and good thermal insulation effect. There are many varieties of lightweight castables, and the properties are also divided into neutral and acidic.

The lining of the kiln basically has an insulating layer. The lightweight castable used for the insulating layer cannot directly contact the flame. The outer layer of the insulating layer generally has castables or refractory bricks for the working layer. Lightweight refractory castable has good thermal insulation effect, slow heat dissipation and good thermal insulation effect. And it can save the use of fuel in the kiln. Different light castables or light castables with different properties can be used in different furnace linings.