Clay is the oldest and most widely used refractory brick manufacturing raw materials are clay minerals, natural refractory clays can be divided into hard clay and soft clay.

Loess is the use of solid clay-based raw materials to manufacture molding, natural materials as coal firing solid red brick. Solid clay, also known as a solid red brick.

Artificial brick building with a small block of wood. Also known fired brick. Solid clay is one of the world's oldest building materials.

The true density of silica brick smaller, more complete conversion of the lime, resulting in a residual expansion process also smaller oven.

Refractory materials by certain particle size distribution of refractory aggregate and powder, binder, additive mixed, also called bulk refractories.

The structural strength of unshaped refractory materials by combining the control, unshaped refractory materials are generally aggregate by combined continuous phase and a discontinuous phase composition of unshaped refractory material.