Robust construction and excellent impact resistance: Cold-rolled steel door frames (≥1.2–1.5 mm) and door leaves (0.8–1.2 mm) deliver exceptional mechanical strength, resisting deformation and external forces, making them ideal for high‑frequency use or high‑risk environments such as industrial facilities, stairwells, and utility shafts.

　　Reliable fire resistance: The interior is filled with non-combustible insulating materials (such as rock wool and perlite), and when combined with fire‑resistant hardware rated for a melting point of ≥950°C, it can consistently achieve a Class A (≥1.5 hours), Class B (≥1.0 hour), or Class C (≥0.5 hour) fire‑resistance rating, effectively preventing the spread of flames and high temperatures.

　　Wide environmental adaptability: The surface is typically treated with galvanizing, powder coating, or fluorocarbon spraying, offering excellent resistance to moisture and mold, making it suitable for basements, garages, coastal areas, and regions with heavy rainfall—outperforming wooden fire doors.

　　Excellent smoke-sealing performance: the door leaf overlaps the door frame by at least 10 mm, with side gaps no greater than 4 mm, and is fitted with a non-combustible, heat‑expanding sealing strip, effectively preventing smoke from spreading during a fire.

　　Long service life and low maintenance costs: With proper use, it can last 15–20 years, requiring only periodic inspections of hardware (hinges, door closers) and touch‑up of rust‑proof paint on scratched areas—no frequent maintenance like that required for wooden doors.

　　Meets stringent standards and features clear classification: Complies with national standards such as GB 12955, is explicitly categorized by fire‑resistance rating to facilitate selection based on site‑specific risk levels, and is accompanied by a factory‑issued fire‑safety inspection report, ensuring quality control.