Refractory cement and high temperature cement are often mentioned in practical applications. Although they have similarities in some properties, they also have obvious differences. The following is a comparative analysis of them:

I. Definition and composition

Refractory cement: It is composed of refractory powder, binder and additive, and is an unshaped refractory material used for building refractory bricks, filling brick joints or as coating material. Its composition usually includes clay, high alumina, silica and magnesia and other refractory raw materials.

High temperature cement: usually refers to a kind of refractory cement, but more emphasis is placed on its bonding performance and fire resistance in high temperature environment. In addition to refractory powder, its composition may also contain special high-temperature binder.

II. Performance characteristics

Refractory cement: high fire resistance, generally above 1650℃.

It has good corrosion resistance and peeling resistance.

High bonding strength and convenient construction.

The thermal expansion coefficient is similar to that of refractory bricks, and it can be destroyed synchronously with masonry.

High temperature cement: The fire resistance is higher, and some products can withstand the high temperature of 1800℃.

The adhesive property is stronger, and it can maintain good bonding force at high temperature.

Small shrinkage during drying and baking, long service life.

Stable chemical properties, non-corrosive to metal matrix.

III. Uses

Refractory cement: mainly used for building refractory bricks and filling brick joints.

It can also be used as coating material of furnace lining to protect furnace lining.

Widely used in metallurgy, building materials, petrochemical and other industries.

High temperature cement: more suitable for bonding and repairing in high temperature environment.

Commonly used for sticking refractory fiber felt and calcium silicate board.

It can be used to repair cracks and holes in pouring bodies or masonry bodies.

It can also be used to protect the insulation coil of intermediate frequency furnace.

IV. Construction and use

Refractory cement: dry powder products need to be mixed with water before use.

During construction, it is necessary to ensure that the brick joints are tightly filled.

High temperature cement: Barreled wet products can be used directly.

The construction is convenient, and it can be applied to the vertical working face without flowing.

V. Summary

Refractory cement is more suitable for conventional refractory brick masonry and furnace lining protection, emphasizing the matching with refractory bricks and the convenience of construction.

High-temperature cement is more focused on bonding and repairing in high-temperature environment, with higher fire resistance and bonding strength.

In practical application, which material to choose should be decided according to the specific use environment and requirements.