Typical Data   SPECIAL GRADES
Properties   C-22 Z BNZ-24 BNZ-25 BNZ-26 HS
Temperature Use Limit
    (Normal oxidizing atmosphere)
°F
°
C
2300
1260
2400
1316
2500
1371
2600
1427
Density, Avg.
    ASTM C 134
lb/ft²
kg/m³
lb/BEq
kg/str.
46
737
2.7
1.2
37
593
2.2
1.0
45
721
2.6
1.2
57
913
3.3
1.5
Modulus of Rupture
    ASTM C 133
lb/in²
MPa
kg/cm²
210
1.4
14.8
120
0.8
8.5
150
1.0
10.6
360
2.5
25.4
Cold Crushing of Strength
    ASTM C 133
lb/in²
MPa
kg/cm²
320
2.2
22.5
130
0.9
9.2
260
1.8
18.3
580
4.0
40.8
Permanent Linear Change %        
    ASTM C 210          
    24 hrs at soaking temp: °F (°C)          
    2250 (1232)   0.0
    2350 (1290)   -0.4
    2450 (1343)   -0.4
    2550 (1399)   -0.7
    2750 (1510)  
    2800 (1538)  
    2950 (1621)  
    3150 (1732)  
Reversible Linear Thermal Expansion %        
    at 2000°F (1093°C)   0.5 0.6 0.6 0.6
Hot Load Strength %        
    ASTM C 16 deformation        
    10 psi load for 11/2 hours: °F (°C)          
    2000 (1093)   0.1 0
    2200 (1204)   0.3 0.1
    2400 (1316)  
Thermal Conductivity Btu-in/ft², hr, °F        
    ASTM C 182 (W/mk)        
    Mean temperature, °F (°C)          
      500   1.5 0.9 1.8 1.9
      (260)   0.22 0.13 0.26 0.27
      1000   1.8 1.1 2.1 2.2
      (538)   0.26 0.16 0.30 0.32
      1500   2.2 1.4 2.5 2.5
      (816)   0.32 0.20 0.36 0.36
      2000   2.5 1.6 2.8 2.8
      (1093)   0.36 0.23 0.40 0.40
     To convert
Btu-in/ft
², hr, °F to Kcal-m², hr, °C,
     multiply by 0.124.
         
Chemical Analysis          
    Alumina – Al2O3   35 40.0 34.0 44.7
    Silica – SiO2   60.1 47.2 63.0 49.9
    Ferric Oxide – Fe2O3   1.1 0.5 0.7 0.6
    Titanium Oxide – Ti2O2   1.3 1.5 1.4 1.6
    Calcium Oxide – CaO   2.1 10.3 0.3 0.6
    Magnesium Oxide – MgO   0.0 0.2 0.1 0.1
    Alkalies, as Na2O & K2O   0.4 0.3 0.5 2.5
*ASTM C 113