Sling general use in explosive environments, in itself does not produce sparks. The world's first synthetic fiber a flat sling since 1955 in the United States successfully applied in the field of industrial lifting, it is widely applied to shipbuilding, metallurgy, machinery, mining, petroleum, chemicals, ports, power, transportation, military and other fields. Sling has portability, easy maintenance and good chemical resistance, and light weight, high strength, excellent characteristics such as easy to damage the lifting surface, it is increasingly popular use of personnel and in many ways to gradually replace the wire rope a. Conventional lifting belt (synthetic sling), the general production of high-tenacity polyester filament, high strength, wear resistance, anti-oxidation, anti-UV, such as multiple advantages, but soft, non-conductive, non-corrosive (the human body without any harm), is widely used in various fields. Many types of conventional sling sling (sling by appearance) is divided into four categories: core ring wear, ring flat, his eyes through the core, his eyes flat four.