What are lightweight castables?

Lightweight castables are formulated with refractory lightweight aggregates, powders, binders, and admixtures. General regulations: Castables with a bulk density of less than 1800kg/m3, no requirements for refractory resistance, or a total porosity greater than 45%, and a linear shrinkage of less than 1.5% at a specified temperature are called lightweight refractory castable.

Characteristics of lightweight castables

Lightweight insulation castables are characterized by low volume density, low thermal conductivity, and good thermal insulation properties. They are used in kilns and thermal equipment in industrial sectors such as metallurgy, petrochemicals, electric power, and building materials. Lightweight refractory castable is used for It has many applications. It is generally used as a heat insulation layer, and can also be used as a working layer or load-bearing component, both of which achieve good results. In the parts in contact with liquid metal or slag, only the tundish is used with thermal insulation panels, and good results are achieved. The performance testing of lightweight refractory castables is the same as that of heavy refractory castables The difference is that for the test of load softening temperature, the load load is 0.1MPa. It should be pointed out that with the need for energy saving in industrial furnaces, lightweight refractory castable will surely receive greater development. Its direction is lightweight, high strength, low thermal conductivity, easy to use, and low price. In addition, lightweight aggregates and binders are generally used in combination, and mixed with admixtures to develop excellent lightweight refractory castable.

Classification of lightweight castable

There are many varieties of refractory castables, which are generally classified according to principles such as lightweight aggregate varieties, production methods, binder types, and performance levels. The most commonly used types of lightweight aggregates are insulation castables such as lightweight brick sand, porous clinker, hollow balls, ceramsite, and expanded perlite.