Resistant at high temperatures and against scaling.

This term should only be used for metal materials, regarding ceramic or mineral substances which are resistant to high temperatures, the correct term would be refractory. For example, a heat-resisting steel is one which is suitable for use at high or highest temperatures and exhibits high scaling resistance. Cast steel can be heat-resistant for operating temperatures of between 300 and 600°C and highly heat-resistant for temperatures above 600°C.