What material is commonly used for fire-resistant doors?

Steel is commonly used for fire-resistant doors due to its structural integrity and ability to withstand high temperatures without deforming or igniting. Steel fire doors are designed to provide a barrier against the spread of flames and smoke, making them an essential component in fire protection systems. They can resist fire for a specified duration, often measured in hours, depending on their construction and the materials used in their insulation.

Unlike wood, which can burn and compromise fire safety, or glass, which may shatter under heat, steel retains its strength and function under fire conditions. Plastic is generally not used for fire-rated doors because it can melt or emit toxic fumes when exposed to flames. Thus, in contexts where fire safety is a priority, steel is the preferred material for constructing fire-resistant doors.