The reasons why Beast mortar plaster bears high temperatures is because it contains a large percentage of non-combustible scoria, in addition to the volcanic origin of the zeolite mineral, which makes its resistance to high temperatures ideal, as it is used in many uses for metal melting furnaces, stoves, boiler rooms, and fire-resistant buildings, as it has reached the strength of heat tolerance According to the tests of the University of Science and Technology, reference No. (38), it reached 400 degrees Celsius, and according to the American Standard No. ACTM E 119-