Home » Fire Clay » Clay Refractory Mortar

Clay Refractory Mortar

Clay Refractory Mortar

Fire Clay

Item Code:A4101

Composition of clay refractory mortar
Clay refractory mortar is made from calcined clay (clinker), waste clay brick powder and combined clay (raw material). Clinker is major component of clay refractory mortar with content of about 75%~80%. Raw clay is a binder which its function is enhancing plasticity of the mortar and reduce breathability and water loss rate. However, the batching amount of raw clay cannot be too large, otherwise it will be easily cracked. The proper batching amount should be 20%~25%.


Clay refractory mortar is mainly used in furnace body joint and repair of different kinds of furnace with clay brick masonry, such as blast furnace, hot air furnace, coke oven, soaking furnace, heat exchanger and boiler.


Clay refractory mortar, as joint material, is able to adjust size deviation of bricks to make masonry structure regular with uniform load, and strengthen the masonry as a compact whole, so as to resist damages of external forces and avoid invasion of gas and molten liquid.

  1. Good plasticity and construction convenience.
  2. Sufficient bond strength to combine the masonry as a solid whole at working temperature;
  3. Low thermal conductivity.

Physical and Chemical Indicators

Item Index
NN-30 NN-38 NN-42 NN-45A NN-45B
Refractoriness,℃ ≥ 1630 1690 1710 1730 1730
AL2O3, % ≥ 30 38 42 45 45
Cold flexural bond strength MPa 110℃ after drying 1 1 1 1 2
after sintering
3 3 3 3 6
0.2MPa  RUL,℃ T2.0 ≥ 1200
Linear change rate % 1200℃×3hafter  sintering +1 ~-3
1300℃×3hafter  sintering +1 ~-5
Bonding time 1~3
Particle size % -1.0 mm 100
+0.5mm ≤ 2
-0.074mm ≥ 50
Let's help you!
Call us: + 0086 372 5081703
Henan AGRM FurnTech Co., Ltd
Scroll to Top