Fire-Resistant Layer Design: The insulation and sheath of fire-resistant cables use flame-retardant materials to form a stable protective layer at high temperatures. The insulation and sheath of fire-resistant cables often use flame-retardant polymers, such as halogen-free low-smoke flame-retardant materials (LSZH). These materials do not release toxic or harmful gases when exposed to flames and effectively inhibit the further spread of flames. Their flame-retardant mechanism lies in the metal hydroxides (such as aluminum hydroxide and magnesium hydroxide) added to the material. These substances decompose and absorb heat at high temperatures, releasing water vapor, reducing the oxygen concentration, and thus delaying the cable's combustion.
Multi-Layer Structure Advantages: The cable adopts a "concentric layer + armor" structure, including a conductor layer, a mica insulation layer, and a flame-retardant sheath to ensure performance and strength. The cable design is very sophisticated, typically employing a "concentric layer + armor" construction. Its core component is the conductor layer, generally made of copper or aluminum, ensuring the cable's conductivity. Next is the mica insulation layer, which tightly wraps around the conductor, providing excellent high-temperature insulation. In addition, a flame-retardant sheath is included to effectively block the intrusion of external flames. If further enhancement of the cable's mechanical strength is required to prevent collapse or breakage in a fire, a metal armor layer can be added as an option.