The resistance to bending stress at high temperature is a property of extreme importance for load-bearing elements made of refractory material, such as lintels, ceramic rollers, plates for continuous casting of steel, etc.

In fact, when these are subjected to a flexural load under high temperature conditions, they exhibit different mechanical performances compared to room temperature ones, due to various possible phenomena such as the formation of new binding or reinforcing phases, softening of the matrix, grain boundary creep, recrystallization, oxidation or decomposition, etc.

The Hot MOR of samples is determined with special instrumentation according to the methods detailed in ISO 5013, UNI EN 993-7 and ASTM C583.