Andalusite brick

Description of andalusite brick

Kerui Refractory andalusite brick is used as the primary lining for various industrial furnaces. Its refractoriness under load reaches a maximum of 1700°C (3092°F). Andalusite brick can effectively improve the efficiency of high-temperature industrial furnaces.

Characteristics of andalusite bricks (Russian brand МЛУТ)

Indicator	MLUT-62	MLUT-69.
Al2O3, not less, %	62	69
Fe2O3, not more than %	1.3	1.2
Open porosity, %, not more than	17	19
Compressive strength, N/mm2, not less than	50	50
Additional linear shrinkage at T=1500℃ and 2 hours exposure time, %, no more than	0.6	0.6
Softening onset temperature under 0.2 MPa load, ℃, not lower	1600	1650
Heat resistance (heating up to 1300℃ - water), heat change, not less than	25	30

Characteristics of andalusite bricks (Chinese grade)

item		RH-155	RH-150	RH-145	RH-140	RH-135	RH-130
Al2O3, %	≥	69	65	61	57	53	49
Fe2O3，%	≤	1	1	1.2	1.2	1.5	1.5
TiO2, %	≤	0.5	0.5	0.5	0.6	0.6	0.6
Porosity, %	≤	20	20	20	20	20	20
Volumetric density, g/cm³		2.55~2.70	2.50~2.65	2.45~2.60	2.40~2.55	2.35~2.50	2.30~2.45
Compressive strength, MPa		55	55	50	50	40	40
0.2MPa softening temperature under load, ℃	≥	1700	1700	1650	1600	1520	1450
Permanent replacement of heating line, %		1500℃*2h ±0.2			1450℃*2h ±0.2
Creep rate (0.2MPa, 0-50h) / %	≤	0.8 (1550℃)		0.8 (1450℃)	0.8 (1400℃)	0.8 (1350℃)	0.8 (1300℃)

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Properties of andalusite bricks

1. Andalusite bricks have excellent heat resistance and can withstand exposure to high temperatures without significant deformation or breakage.
2. Andalusite bricks have excellent abrasion and corrosion resistance, withstanding wear and corrosion under long term use.
3. Andalusite-based firebricks are highly resistant to thermal shock: they withstand sudden temperature changes and thermal shocks, even under extreme loads, without cracking or breaking.
4. Andalusite bricks have a very low creep coefficient, meaning they deform very little under load at high temperatures and retain good stability and strength.
5. Andalusite lining bricks have a high softening point under load, meaning they are capable of maintaining a high level of strength and stability under loads at high temperatures.
6. Andalusite bricks reduce harmful impurities such as iron oxide, which improves their insulating properties and durability.
7. Andalusite bricks also have good resistance to thermal cracking, i.e. large areas of cracking do not form on its surface under high temperature conditions, thus preserving its service life and stability.