Refractoriness under load: a test in which a sample under a constant compressive load, commonly 0.2 MPa, is heated at a set rate while its height is tracked, and the temperatures at which it has deformed by set amounts, such as 0.5, 1 and 5 percent, are reported. It ranks how well a material keeps its shape when it carries weight hot, which matters for crowns, checkers and tall walls.
RUL T0.5 is 1680 on the new high-alumina, the old one started moving at 1550.
Also heard as
- refractoriness under load
- load test
Related terms
Creep
Slow, permanent deformation of a refractory under steady load at high temperature over hours to years.
HMOR
Hot modulus of rupture: the bending strength of a refractory measured at high temperature.
PCE
Pyrometric cone equivalent: a refractory's softening point expressed as the number of a matching standard cone.
Refractoriness
Ability of a material to withstand high temperature without softening or melting.