98% Alumina Low Cement Castable: Which Test Results Matter?
High alumina content is only one line of the specification; review impurity levels and properties at stated test temperatures.
A 98% alumina figure describes chemistry, not the complete installed performance of a low cement castable. Buyers should ask whether the figure is typical, minimum, or a guaranteed range, and whether it applies to the whole dry mix. The binder and any additives also matter to the final lining.
Read the test conditions
Compare bulk density after drying with density after firing only when their temperatures are stated. Cold crushing strength measured after a 1,600°C treatment answers a different question from strength measured after a 110°C dry. Permanent linear change and thermal conductivity also need their test temperatures and units attached.
Confirm the low cement basis
The name alone does not state a maximum CaO or cement content. If the project specification defines that limit, obtain a written value for the proposed grade. Review the permitted water range and mixing method: a high purity aggregate does not compensate for an unsuitable installation process.
The Royal LC-98 datasheet lists its published values. Use those values with the lining's exposure, geometry, and approval requirements when comparing offers.