Mica Tape — Key Refractory Barrier of High-rise Building Cables
Published time:
2026-04-29 09:39
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Mica Tape: A Critical Fire Barrier for High-Rise Buildings
一、云母带：天生适配火场的无机 “安全卫士”
Mica tape is a strip-shaped insulating material made from core raw materials such as synthetic mica and phlogopite, combined with glass fiber cloth and silicone adhesive. As an inorganic mineral product, it features a stable molecular structure and delivers superior high-temperature resistance, fireproof and insulating properties that organic materials cannot match.
Ultra-high Temperature Resistance, Fire Resistant
Temperatures in building fires generally range from 750℃ to 1000℃. Conventional plastic and rubber insulation softens and melts above 200℃, resulting in complete loss of insulation performance. Mica has a melting point above 1200℃, and synthetic mica tape can withstand over 1300℃. It maintains stable structure for long periods under 800℃–1000℃ flame conditions, with no melting, dripping or combustion, and closely wraps cable conductors.
Stable High-temperature Insulation, Securing Continuous Power Supply
When cable outer sheaths and insulation are burned out during a fire, mica tape sinters into a dense, rigid insulating layer that firmly adheres to conductor surfaces and forms a reliable barrier. With high dielectric strength and strong voltage resistance, it prevents short circuits and electric leakage, sustains circuit operation in fires, and meets the standard requirement of 90-minute fire-resistant power supply.
Low Smoke, Reducing Secondary Hazards
Toxic heavy smoke is a major cause of casualties in high-rise building fires. As an inorganic material, mica tape emits minimal toxic fumes when exposed to fire. Featuring low smoke density and low toxicity, it reduces physical harm and visual obstruction, and improves safety for evacuation and emergency rescue.
Flexible & Durable, Adaptable to Complex Construction
Mica tape is tough and elastic, enabling tight wrapping on cable conductors. It resists cracking and peeling during cable bending and installation, forming an integral continuous fire-resistant protection layer. Its excellent flexibility suits complex laying conditions such as cable shafts and concealed wiring in high-rise buildings, ensuring stable fire resistance without construction damage.
Unique demands of high-rise buildings call for mica tape exclusively
Meet Core Mandatory Code Requirements
In accordance with Code on Fire Protection Design of Buildings, Design Standard for Cables in Electric Power Engineering and other relevant codes, power circuits for key facilities in high-rise buildings — such as fire control rooms, fire water pumps, smoke control fans, emergency lighting and fire alarm systems — must adopt fire-resistant cables. Mica tape shall be wrapped around cable conductors as the fire-resistant layer, a clear technical mandate and rigid regulation for building fire safety.
Prolonged Fire Resistance for Evacuation & Rescue
High-rises feature long evacuation routes and difficult rescue operations, requiring emergency systems to maintain power for no less than 90 minutes. Verified by fire resistance tests, mica tape fire-resistant cables can operate continuously for 90 minutes without breakdown or short circuit under 750℃–950℃ flame. Special grades can withstand up to 180 minutes, fully meeting the time demands of high-rise fire rescue.
Resist Multi-layer Combustion to Build Solid Defenses
The structure of fire-resistant cables: copper conductor → mica tape fire-resistant layer → insulation layer → outer sheath. In a fire, the outer sheath and insulation burn and carbonize first. As the core protective barrier, the inner mica tape maintains stable insulation at high temperatures. It ensures continuous power supply even if outer layers are damaged, preventing paralysis of emergency systems.
Suitable for Dense Wiring & Restrain Fire Spread
Cables are densely arranged in electrical shafts and piping shafts of high-rise buildings. Common cables easily trigger the chimney effect and accelerate fire spread during combustion. Non-combustible and non-dripping, mica tape effectively blocks flame propagation along cables, restricts fire expansion in shaft spaces and lowers overall fire hazards.
Why Other Materials Cannot Replace Mica Tape?
Insufficient high-temperature resistance
The long-term temperature resistance of ceramic silicone rubber is only 200℃-300℃, with an instantaneous limit of 600℃-800℃, which tends to fail prematurely in fire scenarios. Flame retardant plastics have even lower heat resistance and melt at around 200℃.
Poor insulation stability
Organic insulating materials decompose and carbonize under high heat, leading to rapid deterioration of insulation performance and frequent short circuits. In contrast, mica tape maintains stable insulation at high temperatures and sinters into a rigid protective layer for more reliable protection.
Inadequate safety performance
Most organic high-temperature resistant materials release toxic dense smoke when burning and aggravate secondary disasters. Mica tape features low smoke and halogen-free properties, making it better suited for high-rise buildings with dense crowds.
Details Build a Comprehensive Defense, Mica Guards Safety
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