Plastic refractory castable are made of high quality refractory aggregate mixed and kneaded with a combination of clay, water and lightweight aggregates, refractory powders, binders and additives, and they can be easily formed and installed to suit any specific shape.In the case of plastic refractories, they stay soft and can be freely shaped and reshaped at will, which can be valuable in the case of an emergency cases. They are mainly used as linings for various heating furnaces, soaking furnaces, annealing furnaces, sintering furnaces, and electric furnace roofs in the steel industryIn addition to this, they are used for walls, ceilings, bottoms or burner blocks of perse furnaces.

The main components of plastic refractory castable are granular and powdery materials, accounting for 70% to 85% of the total. It can be made of refractory materials of various materials, and it is often classified and named according to the material. Because this unshaped refractory is mainly used in various heating furnaces that are not in direct contact with the melt, clay clinker and high-aluminum clinker are generally used. Light-weight plastic materials are usually used to prepare lightweight plastics.

Plastic clay is an important component of plastics, it only accounts for 10% to 25% of the total weight of plastics, but it has a stable bonding strength to plastics and its hardened body, plasticity of plastics, and volume stability of plastics and its hardened body Both sex and fire resistance have a great influence. In a certain sense, it can be considered that the nature and quantity of clay control the properties of plastics.

Hardening and strength of plastic refractory castable：

In order to improve the shortcomings such as slow hardening after construction and the low strength at room temperature, plastics that use soft clay as the bonding agent often add an appropriate amount of gas-hardening and thermosetting bonding agents and their polymers.

Plastics without chemical binders are called ordinary plastics. This type of plastic has a low strength before being sintered, but as the temperature increases, moisture escapes and the strength increases. After sintering at high temperature, the cold strength increases. However, the hot state strength decreases with increasing temperature at high temperatures.

The strength of plastics added with sodium silicate increases rapidly with the temperature after construction, and it can be demolded quickly after construction. However, during the drying process, this bonding agent may migrate to the surface of the structure or product, preventing the smooth removal of moisture, causing stress and deformation of the skin. In addition, plastic debris after construction is not suitable for reuse. Plastics containing this kind of binder are suitable for large-scale kilns with long construction periods and for roofs.

Aluminum phosphate is the most widely used thermosetting binder in plastics. It can be dried and baked to obtain high strength after construction.

Features

Easy construction,

Good plasticity,

Excellent wear resistance

Low thermal conductivity

Small volume density

Good thermal insulation

Good thermal shock resistance

long lasting

Applications

Widely used in the insulation parts of industrial kilns and thermal equipment in metallurgy,heat treatment furnace、Furnace of incineration of garbage, recirculating fluidized bed furnace、mechanical power, petroleum, chemical and other industries.

Physical And Chemical Indicators