In order to meet the needs of use in special occasions and harsh conditions, halogen-free heat shrinkable sleeves have good mechanical and insulating effects, as well as resistance to aging, corrosion, good strength, a service life of more than 20 years, easy to use, and very good resistance combustion performance. Although halogen-containing heat shrinkable sleeves also have good flame retardant properties, when a fire occurs, such halogen-containing flame retardant materials will produce a large amount of smoke and toxic corrosive hydrogen halide gas, causing secondary hazards. ...