Refractory clay is the main raw material for producing refractory clay bricks, and the clay

particles that make up the clay have a very small scale - no more than 5p (micrometers).

Due to the high dispersibility of particles and certain characteristics of particle structure,

clay has the function of forming plastic mud masses when water is permeable. Plasticity

can be understood as the function of Fire brick to change its shape when subjected to

external force, and adhere to the shape obtained when the external force stops.

The plasticity of refractory clay bricks is mainly determined by the raw material clay, and

the main factors involved are:

1. The size of clay particles is small.

2. The thin layered structure of clay particles.

3. There is a tight water film around the clay particles.

The clay of refractory clay bricks has plasticity only under wet conditions. When water is

gradually added to clay, its plasticity is initially weak. In the future, when water is continuously

added, its plasticity will be added, reaching a higher limit, and then it will begin to decrease.

Later, it disappears because the clay mass becomes liquid. When the clay mass has a large plasticity,

its state will be the standard consistency, which is determined by the weight of water (usually referred

to as the standard water content).