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Professional Manufacturing Technology of Class A & B Composite Insulated Glass Fire Doors
Composite insulated glass fire doors are core special facilities within the modern building fire protection system. They integrate architectural transparency and aesthetic appeal, daily practical usability, and fire insulation performance under fire conditions, and are widely deployed in commercial complexes, industrial plants, public buildings, underground civil air defense projects and other premises.
Class A and Class B represent the mainstream fire resistance grades in the industry, classified in accordance with the national standard GB 12955 Fire Doors. Standardized graded systems are formed between the two grades in terms of fire resistance duration, structural configuration, manufacturing processes and applicable scenarios. The core manufacturing principle of high-quality composite insulated glass fire doors lies in the precise coordination of five key components: composite fire-resistant glass, high-strength steel frames, high-density heat-insulating core materials, fireproof sealing systems and dedicated fire-resistant hardware. This synergy delivers triple safety guarantees: fire integrity, thermal insulation and smoke resistance, while meeting long-term service requirements including wear resistance, deformation resistance and anti-aging performance.
Performance Grades of Class A & Class B Composite Insulated Glass Fire Doors
Class A Steel Fire Door with Fire-resistant Glass
Class A fire doors feature a fire resistance time of no less than 90 minutes as high-grade fireproof products. They are applicable to high-risk fire zones including openings on firewalls, power distribution rooms, boiler rooms, Class A and B factory buildings and warehouses, underground connecting passages, refuge walkways and so on.
Such products adopt top-spec base material thickness, high-density fire-resistant core materials and multi-layer composite fire-resistant glass, with outstanding thermal shock resistance and deformation resistance. They can withstand sustained high-temperature flame and smoke erosion, effectively block fire spread, and adapt to stringent fire service conditions.
Class B Steel Fire Door with Fire-resistant Glass
Class B fire doors have a fire resistance time of no less than 60 minutes as general-purpose fireproof products. They are mainly installed in conventional building areas such as smoke-proof stairwells, front rooms of fire elevators and building partition passages. The doors can efficiently contain smoke propagation and slow down fire spread, winning precious time for personnel evacuation and fire rescue operations.
While complying with national standard fire protection requirements, the product features optimized self-weight structure and transparent visual effect, balancing fire safety and architectural decoration practicability.
Core Material Selection of Composite Fire-resistant Glass
Fire-resistant glass serves as the core functional component of glass fire doors, distinct from ordinary tempered glass.
Both Class A and Class B insulated glass fire doors adopt multi-layer composite fire-resistant glass as the primary light-transmitting component, eliminating the single protective defect of single-layer glass. High-transmittance low-iron tempered glass sheets are selected as base materials, featuring high light transmittance and excellent impact resistance. Special inorganic fireproof gel is poured into the interlayers, which contains no combustible organic substances. Upon exposure to high temperatures, it rapidly foams and ceramicizes to form a dense heat-insulating barrier layer, acting as the core technical element for heat insulation, fire resistance and anti-spalling performance.
Glass edges undergo precise edging and cleaning treatment with no air bubbles or delamination inside. Each glass panel is laser-engraved with fire resistance grade markings. It will not crack or fall off in fire scenarios, stably blocking thermal radiation, flame and smoke, and fully complying with the fire resistance and heat insulation requirements specified in GB 12955.
Fire and Smoke Resistance Performance of Fire Glass Doors: Sealing Systems and Fire-resistant Hardware as Critical Supporting Components
The sealing system and fire-resistant hardware are key supporting parts that determine the fire and smoke blocking performance of fire glass doors. EPDM fire intumescent sealing strips are fully fitted along the door frame. These strips feature high and low temperature resistance and anti-aging properties. They provide dustproof sealing under normal temperature, and expand to block gaps and isolate flame and smoke when exposed to fire. The glass area adopts double sealing with pressing strips and fire-resistant gaskets to prevent high-temperature flame leakage and glass loosening.
All supporting hardware are fire-resistant accessories qualified by fire inspection, including fire hinges, locks, door closers and sequence closers. They boast high temperature resistance, rust resistance and structural strength, and are durable for long-term service. In case of fire, they can automatically close and latch the door leaf to stably separate fire compartments, eliminating fire hazards caused by failure of ordinary hardware under high temperature.
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