What are the Characteristics of Refractory Castables?

Refractory Castables are typically used within kilns and furnaces to create the monolithic linings. Refractory castables are made from fine – course refractory grains that are combined together with a cement binder.

Refractory castables are combined with water and then poured, pumped, or pneumatically shot into position to form refractory shapes. There are different types of refractory castables that have their own unique characteristics based on the composition. Are you interested in learning about the various types of castables? Here are three types of castables and their traits. Click To Tweet

Conventional High Alumina Cement

High alumina cement castables are most commonly used in boilers and furnaces. They are resistant to abrasion. Gunning and casting are the methods used to install these castables. Gunning is the preferred installation method when working with bulk materials.

Low Density

Low-density materials are used for insulating in high-temperature facework. A characteristic of these insulating castables is that they are not good thermal conductors. They’re typically used as backup linings in refractories because they are not resistant to abrasion.

Free Flowing

Free flowing castables are easier to shape. They are abrasion resistant and have low porosity. It takes minimal effort to pump these castables into the correct position because they use less cement.

Pro Tip: Free flowing refractory castables are convenient because they are moldable. However, they shouldn’t be used in furnaces when a lot of wear and tear is to be expected because their lower density makes them susceptible to damages.

Understanding Refractory Castables

It’s important to understand the various types of castables and their characteristics when working with refractories.  

Do you have any questions about the specifications of each refractory castable type? Join the conversation to speak with one of our experts about castables for refractory shapes.