Layers of gypsum or cementitious materials are cast inside the steel shell. These materials contain moisture that, when heated, is released as steam, keeping the internal temperature significantly cooler than the exterior.
When choosing a file, look for certifications from . The rating indicates how long the file can withstand a fire and what it is designed to protect: Class 350: Maintains an internal temperature below fire proof files
High-quality models include a steel wire lattice to ensure the cabinet maintains its shape even if it falls through a collapsing floor. Understanding Fire Ratings Layers of gypsum or cementitious materials are cast