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Low Cement Castables

The list is illustrative and does not cover the full range of products and some of the improved items which have been recently developed.
 
Low Cement Castables A B C D E F
Al2O3 % 70 90 80 90 70 70
SiC % N.A. N.A. N.A. N.A. 15 N.A.
Max service Temp. (°C) 1650 1800 N.A. N.A. N.A. 1650
Grading (mm) 0-5 0-5 N.A. N.A. N.A. 0-5
B.D.(gm/cc) 2.80 2.90 2.93 3.02 2.90 2.65
PLC % ±0.50 ±0.40 -0.18 ±0.20 +0.12 ±0.50
 (at °C/3 hrs) 1400 1400 N.A. N.A. 800 1450
Refractoriness (°C) N.A. N.A. 1820 1820 1820 1790
CCS (kg/cm2) (at 110°C/24 hrs) 700 1000 860 980 200 700
MOR N.A. N.A. 1200 1290 40 N.A.
 (at °C/3 hrs) N.A. N.A. 1550 1550 800 N.A.

 

Insulating Castables A B C
Al2O3 % 40 45 63
SiO2 % 42 42 26
B.D. (kg/m3) 1430 1600 1550
PLC % (at 1100°C/3 hrs) ±0.2 ±0.2 ±0.5
Refractoriness (°C) 1430 1430 1600
CCS (kg/cm2) (at 110°C/24 hrs) 100 180 140
MOR (at 110°C/24 hrs) 18 90 40
Thermal conductivity (Kcal/m hr 500°C) 0.42 0.44 0.42

 

Insulating bricks A B C
Al2O3 % 40 70 72
A.P. % 60 N.A. N.A.
B.D. (gm/cc) 1.10 1.20 1.35
PLC % ±1.0 +0.8 -0.5
 (at °C/5 hrs) 1350 1600 N.A.
 (at°C/24 hrs) N.A. N.A. 1450
Refractoriness (°C) 1400 1825 N.A.
CCS (kg/cm2) (at 110°C/24 hrs) 40 50 35
Thermal conductivity (Kcal/m hr°C) 0.35 0.42 0.64
 (at °C) 500 500 1000

 

Ceramic Fibre A B
Al2O3 % 43-47 32-36
SiO2 % 53-57 44-48
ZrO2 % N.A. 16.5-19.5
Temp. Limit (°C) 1260 1425
Tensile strength (128kg/m3) (Kpa) 30-60 30-60
Linear shrinkage (%) 2.4-3.2 <3.5
 (at °C/24 hrs) 1200 1400
Sp.Heat capacity at 980°C (kj/kg°K) 1.07 1.07
Thermal conductivity at 800°C (W/mK) 0.18 0.17

 

 

     
 
 

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