LSZH cable is an eco-friendly, flame-retardant cable characterized as "Low Smoke Zero Halogen." Its core feature is that, when exposed to fire, it generates minimal smoke and releases no toxic or corrosive gases—such as halogens. Within the safety frameworks of modern buildings and infrastructure, LSZH cables are becoming an indispensable core component. Thanks to their unique material properties, LSZH cables provide critical safeguards for human safety during fire emergencies.
The sheathing material for LSZH cables typically consists of cross-linked polyolefin(XLPE), supplemented with aluminum hydroxide or magnesium hydroxide acting asflame retardants. Their flame-retardant mechanism operates through the following processes:
- Endothermic decomposition, which lowers the temperature;
- The release of water vapor to dilute combustible gases；
- The formation of a high-temperature-resistant carbonaceous char layer to isolate oxygen
Their core performance advantages include:
Low Smoke Density: During combustion, smoke light transmittance can exceed 70%,allowing for a visible distance of over 60 meters—thereby facilitating personnel evacuation.
Halogen-Free Emission: They do not generate toxic acidic gases such as hydrogen chloride or dioxins; their toxicity index is significantly lower than that of traditional PVC cables (for instance, while the toxicity index for PVC is 15.01,LSZH cables can be as low as 0.79).
High Safety:They are ideally suited for use in densely populated or enclosed spaces, such as subway systems, high-rise buildings, hospitals, and data centers.
Wide Temperature Range:They can withstand temperatures ranging from -30°C to 150°C, with a tensile strength exceeding 1.2 Kgf/mm².
Common models include WDZA-YJY, WDZCN-YJY, and WDZC-BYJ; these are widely deployed across sectors such as rail transit, marine engineering, new energy, and aerospace.Although the cost of LSZH cables is slightly higher than that of traditional PVC cables, when measured against the value of human life, this investment is undoubtedly worthwhile. As global emphasis on fire safety and environmental protection continues to grow, LSZH cables are gradually becoming the mainstream choice for modern electrical systems, constructing an invisible line of defense for our daily lives.
