On the basis of traditional proportioning, high strength impervious castables are adjusted by particle gradation, adding different admixtures, reducing cement dosage, improving performance, improving medium temperature strength and load softening temperature, reducing thermal conductivity and good thermal stability. With the penetration resistance, corrosion resistance, impact resistance, abrasion resistance, good mechanical properties, furnace structure, strong integrity, air tightness is better than brick stove, prolonging the life, save the furnace repair cost, the characteristics of significant economic benefits. Widely used in power plant, boiler, furnace, heating furnace, furnace, heat treatment furnace and induction furnace in different parts of the lining.

The cement added at 3-8%, and the CaO content is generally between 1-3%, is called low cement castable. The castable with CaO content less than 1% is called super low cement castable.

A series of super low cement and cement free refractory castable properties:

The traditional ordinary castable cement content as high as 10 to 30%, while the low cement matrix, ultra low cement castable is used and the chemical composition of the main material of the same or similar ultra fine powder (particle size less than 5um) replace some or most of the cement, while adding dispersant trace (superplasticizers) and a certain amount of delayedaction retarder prepared.

Its advantages are:

1) the low calcium oxide content in the castable can reduce the low eutectic phase produced in the material, thus improving the refractoriness, the high temperature strength and the slag resistance.

2) the cement hydrates generated after molding and curing, a lot of damage to the hydration key temperature decreased the intensity of the problem does not exist in the heating and baking, but with the increase of heat treatment temperature and sintering strength increases gradually;

3) the water requirement of the castable is greatly reduced, so the porosity is low and the volume density is high.