Insulating mullite refractory bricks

Excellent Chemical Stability and Low Thermal Conductivity

Application

Used in the working (unprotected) lining of furnaces, not subjected to the action of melts, abrasive forces, and mechanical impacts, or in the intermediate (protected) insulation.

Description

Mullite lightweight heat-insulating brick belongs to high-alumina refractories. Mullite lightweight refractory brick represents a new type of heat-insulating material with Al₂O₃ content 50-80%, where mullite (3Al₂O₃·2SiO₂) is the main crystalline and binding phase.

Specifications

Item	JM23	JM25	JM26	JM27	JM28	JM30	JM32
Al2O3 % ≥	40	50	55	60	65	70	77
Fe2O3 % ≤	1.0	1.0	0.9	0.8	0.7	0.6	0.5
Bulk Density g/cm³ ≤	0.55	0.80	0.85	0.9	0.95	1.05	1.35
Cold Crushing Strength MPa ≥	1.0	1.5	2.0	2.5	2.5	3.0	3.5
Linear change on reheating %	1230°С×12h	1350°С×12h	1400°С×12h	1450°С×12h	1510°С×12h	1620°С×12h	1730°С×12h
Linear change on reheating %	-1.5~0.5	-1.5~0.5	-1.5~0.5	-1.5~0.5	-1.5~0.5	-1.5~0.5	-1.5~0.5
Thermal conductivity W/(m·K) ≤
200±25°С	0.18	0.26	0.28	0.32	0.35	0.42	0.56
350±25°С	0.20	0.28	0.30	0.32	0.37	0.44	0.60
600±25°С	0.22	0.30	0.33	0.36	0.39	0.46	0.64
Refractoriness Under Load 0.05 MPa T_0.5 °С ≥	1080	1200	1250	1300	1360	1470	1570

Features

High-Temperature Strength
Thermal Stability
Thermal Expansion
Thermal Shock Resistance

Applications

Widely used

for lining working surfaces of furnaces, directly contacting flame, due to its exceptional thermomechanical properties.
as thermal insulation material in various industrial furnaces, where contact with melts and aggressive gas media is absent. Operating temperature: 1200-1400°C.

Main directions of use:

Thermal Boilers (Power Generation)
Glass Tank Furnaces
Cement Rotary Kilns
Fertilizer Gasifiers
Blast Furnaces & Hot Blast Stoves
Coke Ovens
Electric Arc/Induction Furnaces
Foundry & Steel Teeming Equipment

RS Refractory