There are many types of refractory materials, usually divided into ordinary refractory materials (1580～1770℃), refractory materials (1770～2000℃) and refractory materials (above 2000℃) according to their degree of refractoriness; according to their chemical characteristics, they are divided into acidic refractory materials and neutral Refractories and alkaline refractories. In addition, there are refractory materials for special occasions.

Refractory mortar is divided into finished products and semi-finished products. The so-called finished refractory mortar means that the raw material and clinker have been prepared by the manufacturer in proportion, and only need to add water according to the standard and stir evenly when used on site; semi-finished or non-finished refractory mortar is the raw material and clinker that are not blended together. When using on site, mix thoroughly according to the composition of different slurries, and add water according to the regulations and stir evenly.

Refractory mortar can be divided into different types of materials: clay refractory mortar, high alumina refractory mortar, siliceous refractory mortar, magnesia refractory mortar, etc.

Refractory mortar can be divided into the following three categories according to different binders:

(1) Ceramic bonded refractory mortar is a mixture composed of refractory fine aggregate and ceramic bond (plastic clay). The delivery state is dry, it needs to be used after adding water, and it is hardened by ceramic bonding at high temperature.

(2) Hydraulically bonded refractory mortar is a mixture composed of refractory fine aggregate and hydraulic binder (cement) which plays a major role in bonding. The delivery state is only in dry form. It is used after adding water and does not need to be heated when hardened.

(3) Chemically bonded refractory mortar is a mixture composed of refractory fine aggregate and chemical bonding agent (inorganic, organic-inorganic, organic). The delivery state can be either paste or dry, and harden at a temperature lower than the ceramic bonding temperature. According to the hardening temperature, this refractory mortar can be divided into two types: air-hardening and thermo-hardening. Air-hardening refractory mortar is usually formulated with air-hardening binders such as water glass. Thermosetting refractory mortar is usually formulated with thermosetting binders such as phosphoric acid or phosphate. After hardening, this kind of thermosetting refractory mortar not only has high strength at various temperatures, but also has the characteristics of small shrinkage, tight joints, and strong corrosion resistance.