Air pollution in recent years, resulting in many polluting enterprises directly shut down, for the smart card industry, card materials gradually want to environmental protection materials transformation, the majority of cards on the market are currently made of environmentally friendly materials. Environmental protection PVC material section is divided into: general-purpose PVC resin, high polymerization PVC resin, cross-linked PVC resin. General purpose PVC resin is formed by the polymerisation of vinyl chloride monomer (VCM) under the action of initiators; high polymerisation PVC resin is a resin made by adding chain growth agents to the VCM polymerisation system; cross-linked PVC resin is a resin made by adding cross-linking agents containing dienes and polyenes to the VCM polymerisation system.

　　Smart card environmental material properties.

　　Stable; not easily corroded by acids and alkalis; relatively resistant to heat

　　PVC has the advantages of flame retardant (flame retardant value of 40 or more), high chemical resistance (resistant to concentrated hydrochloric acid, concentration of 90% sulfuric acid, concentration of 60% nitric acid and concentration of 20% sodium hydroxide), good mechanical strength and electrical insulation.