Typical Data SPECIAL GRADES
Properties C-22 Z BNZ-25 BNZ-26 HS
Temperature Use Limit
(Normal oxidizing atmosphere)
°F
°
C
2300
1260
2500
1371
2600
1427
Density, Avg.
ASTM C 134
lb/ft²
kg/m³
lb/BEq
kg/str.
46
737
2.7
1.2
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
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
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)
    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
Hot Load Strength %
    ASTM C 16 deformation
    10 psi load for 11/2 hours: °F (°C)
    2000 (1093) 0.1
    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 1.8 1.9
      (260) 0.22 0.26 0.27
      1000 1.8 2.1 2.2
      (538) 0.26 0.30 0.32
      1500 2.2 2.5 2.5
      (816) 0.32 0.36 0.36
      2000 2.5 2.8 2.8
      (1093) 0.36 0.40 0.40
     To convert Btu-in/ft², hr,
°F to Kcal-m², hr,
°C,
multiply by 0.124.
Chemical Analysis
    Alumina – Al2O3 39.4 34.0 44.7
    Silica – SiO2 51.7 63.0 49.9
    Ferric Oxide – Fe2O3 0.6 0.7 0.6
    Titanium Oxide – Ti2O2 1.5 1.4 1.6
    Calcium Oxide – CaO 6.4 0.3 0.6
    Magnesium Oxide – MgO 0.1 0.1 0.1
    Alkalies, as Na2O& K2O 0.3 0.5 2.5
*ASTM C 113