EVA halogen-free flame retardants are compounds of organic hypophosphorous acid and nitrogen, subjected to special surface treatment processes. They fully meet the requirements for EVA/PE wires and sleeves, offering characteristics such as smooth surface finish on molded parts or wires, no phosphine generation, non-migration, non-bleed-out, and superior electrical performance. The base resins for polyolefin cable compounds primarily include polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), and ethylene-vinyl acetate copolymer (EVA).

With industrial development, the demand for wires and cables is increasing daily. Most insulating and sheathing materials used for wires and cables are organic polymers, which can easily ignite under conditions such as high voltage, heat sources, certain temperatures, and oxygen concentrations. Therefore, flame retardancy in polyolefin cable compounds is essential. While halogenated flame retardants offer high efficiency, they release large amounts of toxic gases during fires, causing "secondary harm" to humans and the environment. Consequently, with growing environmental awareness, developing new, halogen-free flame retardant polyolefin cable compounds has become a hotspot in cable material research. Commonly used halogen-free flame retardants for flame-retardant polyolefin cable compounds mainly include inorganic flame retardants, phosphorus-based compounds, and nitrogen-based flame retardants. These are highly favored in related fields worldwide because they do not volatilize or produce toxic gases during combustion.

Halogen-free flame retardancy in cable compounds has been a research focus in recent years. However, due to the low efficiency and poor compatibility with the matrix of halogen-free flame retardants, flame-retardant cable compounds often suffer from inferior mechanical properties, making their widespread application challenging. Ethylene-vinyl acetate copolymer (EVA) is gaining popularity in the plastics industry for wires and cables, as it maintains good flexibility, impact resistance, and environmental stress crack resistance over a wide temperature range. Using EVA as the base material for cable compounds, applying halogen-free flame retardancy, and improving the mechanical properties of the flame-retardant cable compounds to meet the technical performance requirements of low-smoke, halogen-free flame-retardant cable sheathing materials hold significant value for promoting their application.

Currently, China primarily relies on imported low-smoke, halogen-free flame-retardant wire and cable compounds, which are expensive, limiting their application. With the rapid development of China's economy and increasing safety requirements, the demand for low-smoke, halogen-free flame-retardant wires and cables is growing. Many domestic manufacturers are intensifying efforts to develop such materials. Low-smoke, halogen-free flame-retardant wire and cable compounds represent a key future direction for flame-retardant wires and cables.