Lightweight cementitious fireproofing is based on inexpensive raw materials and as its name suggests, the material is significantly lighter than dense concrete and cement due to their lower densities, so they do not load too much on the structure. Using concrete or cement as a protective coating is not in accordance with any standard or regulations but is only used for its low cost.
SFRM is used as part of a building’s passive fireproofing strategy to delay or prevent the failure of steel and concrete structures that are exposed to the high temperatures during a fire. They do this by thermally insulating the structural members to keep them below the temperatures that cause failure.
Spray-applied fire resistive materials are composed of cement or gypsum and contain other mineral materials such as mineral wool, quartz, mica, perlite or vermiculite. These materials are generally delivered as dry powder in bags which are then mixed with water in the field. Spary-applied fireproofing is primarily used to protect rigid structural elements including columns, beams, walls, joists and metal decks from the effects of heat generated during a fire.
SFRMs are used as protective coatings against cellulosic and hydrocarbon fires for interior and exterior parts of buildings including commercial centers, residential and non-residential constructions, industrial and petrochemical plants. Lightweight cementitious fire resistant materials apply through spray on all horizontal, vertical and spherical structures and have very good adhesion to steel surfaces. These coatings are resistant to high temperature (1200°C) for up to 4 hours. This issue has been tested in laboratories based on international standards such as UL-263 (construction), UL-1709 (petrochemical), ASTM E119, BS 476, NFPA 251 and etc.