Jul 18 , 2025
In fire door construction, "rail and stile" refers to the horizontal (rail) and vertical (stile) components that form the door leaf frame. These elements not only provide structural support for the door leaf but also play a critical role in fire containment and insulation during a fire. High-density calcium silicate boards, with their exceptional fire resistance, high strength, dimensional stability, and lightweight properties, are increasingly being adopted for manufacturing these crucial fire door rail and stile structures.
High-density calcium silicate boards are typically applied in fire door rails and stiles in two primary ways:
1. Solid Rail and Stile Core Material: High-density calcium silicate boards are directly machined into the required sizes and shapes of the horizontal and vertical components, serving as the core material of the fire door frame. These are then covered with decorative facings (such as steel sheets, wood veneers, or other fire-rated decorative materials).
2. Composite Structure Infill: High-density calcium silicate boards are used as infill within metal or wooden frames to enhance the fire rating and insulation performance of the composite frame.
1. Excellent Fire Rating: This is the most crucial advantage. High-density calcium silicate boards are classified as Class A non-combustible materials. They do not burn, produce smoke, or release toxic gases under high temperatures. They effectively block the penetration of flames and heat, helping the fire door achieve fire resistance ratings of 1 hour, 2 hours, or even longer.
2. Superior Insulation Performance: In a fire, besides blocking flames, fire doors must also limit heat transfer from the exposed side to the unexposed side to protect occupants and property. The low thermal conductivity of high-density calcium silicate boards ensures the door's insulation performance, effectively controlling the temperature rise on the unexposed side.
3. High Strength & Dimensional Stability: Under high fire temperatures, common materials can soften and deform, leading to structural failure of the door leaf. High-density calcium silicate boards maintain their structural integrity and dimensional stability at high temperatures, ensuring the door leaf remains intact during a fire, continuing to act as a barrier and providing precious time for evacuation and rescue.
4. Lightweight Property: Compared to traditional solid fire door core materials, high-density calcium silicate boards can significantly reduce the overall weight of the door leaf. This not only facilitates the installation and daily use of fire doors (reducing demands on hardware) but also helps lessen the load on the building structure.
5. Easy Machinability & Assembly: High-density calcium silicate boards can be cut, drilled, and routed using standard woodworking or CNC equipment, making them easy to assemble with other door leaf components (such as hinges, locks, vision panels) and improving manufacturing efficiency.
6. Environmentally Friendly & Asbestos-Free: Modern high-density calcium silicate board products are completely asbestos-free, complying with stringent environmental and health standards.
High-density calcium silicate boards, serving as a key material for fire door "rail and stile," significantly enhance the overall performance of fire doors by providing excellent fire resistance, thermal insulation, structural stability, and lightweight properties. They are an indispensable choice in the manufacturing of modern, high-quality fire doors.
