WAM® 99 ULC – Ultra Low Cement Castable

WAM® 99 ULC is a very high temperature, ultra-low cement containing castable comprised primarily of a pure tabular alumina aggregate. The alumina content, purity and lower cement levels in this product permit usage up to 3400oF.


Tabular alumina is a very high temperature aggregate and differs from both mullite and bauxite. Tabular alumina has a very high melting point but is susceptible to creep which is a tendency to deform at high temperatures under load. As such it is typically not recommended for long term, high temperature use as a support structure. It is however utilized in high temperature chemically reactive conditions where it excels.


Westmoreland Advanced Material LLC’s  ultra-low cement castable technology incorporates the latest available technology in regards to particle size distribution, surfactants, and in-situ reactants that promote volume stability at temperature, density, non-reactivity, water demand, working time and placement characteristics. You will not find a superior product in the market place.


Several versions of these ultra-low cement castables are available including a coarse mix that  increases the material’s resistance to both abrasion and impact. Also available are add on packages for aluminum penetration resistance, and thermal shock resistance. A fine package is available for patching and  intricate precast shapes There is not an alkali resistant package for WAM® 99 ULC.


WAM® 99 ULC finds application in several areas as a very high temperature, thermal protection material also required to resist chemical reaction. It is commonly used in controlled atmosphere reaction furnaces, specifically in reducing atmospheres.

Typical Technical Data
WAM® 99 ULC                                                                                         PDF Download

Classification:Ultra Low Cement Castable
Placement Method:Vibration Casting
Available Application Packages:AL - Aluminum Penetration Resistant
C - Coarse Aggregate
F - Fine Aggregate
TSR - Thermal Shock Resistant
Typical Water Requirement (%wt):4.5
Material Required for Estimating (lb/ft3):194
Maximum Recommended Service Temperature (°F):3400

Calculated wt.% Based on Common Oxides

Aluminum Oxide (Al2O3):98.7 %
Silicon Dioxide (SiO2):<0.1 %
Titanium Dioxide (TiO2):<0.1 %
Iron(III) Oxide (Fe2O3):<0.1 %
Calcium Oxide (CaO):0.9 %
Magnesium Oxide (MgO):<0.1 %
Combined Alkali Oxide (Na2O + K2O):0.3 %


Modulus of
Rupture (psi)
Cold Crushing
Strength (psi)
Linear Change (%)
After 23019613208240n/a
After 150019415409480-0.1
After 3000n/an/an/a-0.2

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.