WAM® 90 NC – Alumina Based No Cement Castable

WAM® 90 NC is a special purpose no cement containing castable.  It is composed primarily of tabular alumina aggregate. This allows the material to be suitable for use up to 3300oF. Because the material is basically calcium free it is suitable for high temperature and highly acidic environments. WAM® 90 NC is for heavy duty acid applications.


These applications are where the primary attack is directly by an acidic material in an aqueous or vapor state. This involves hot face attack as well as subsequent condensation at the cold end of the refractory. This is also typically in contact with a steel shell so the use of a mastic should be considered. This high alumina material is also creep resistant so it can be used in some load bearing applications such as lintels.


WAM® 90 NC  is available in a fine version which is primarily used to make complicated precast shapes. There is also a thermal shock resistant version for use when the hot refractory is impacted by liquid waste streams containing sulfur. The sulfur decomposes and forms sulfuric acid which is very aggressive against calcium and magnesium.

Typical Technical Data
WAM® 90 NC                                                                                           
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Classification:No Cement Castable
Placement Method:Vibration Casting
Available Application Packages:F - Fine Aggregate
TSR - Thermal Shock Resistant
Typical Water Requirement (%wt):4.5
Material Required for Estimating (lb/ft3):180
Maximum Recommended Service Temperature (°F):3300

Calculated wt.% Based on Common Oxides

Aluminum Oxide (Al2O3):89.0 %
Silicon Dioxide (SiO2):10.0 %
Titanium Dioxide (TiO2):<0.1 %
Iron(III) Oxide (Fe2O3):<0.1 %
Calcium Oxide (CaO):<0.1 %
Magnesium Oxide (MgO):<0.1 %
Combined Alkali Oxide (Na2O + K2O):0.3 %
Phosphorous Pentaoxide (P2O5):<0.1 %


Modulus of
Rupture (psi)
Cold Crushing
Strength (psi)
Linear Change (%)
After 23018215105450n/a
After 150018029109850-0.1
After 3000n/an/an/a-0.1

Additional technical data may be available. Please contact your sales representative for more information.
Data on this table represent typical properties and cannot be used for specification purposes.