According to the national standard GB2900.5 provides the definition of insulating material is: "used to make the device in the electrical insulation of the material." That is, to prevent the current through the material. Its resistivity is very high, usually in the range of 10 ~ 10Ω · m. Its characteristics include the following:
<1> Chemical resistance
<2> Glossy, partially transparent or translucent
<3> Most of them are good insulators
<4> Light weight and rugged
<5> Easy processing can be mass-produced and cheap
<6> wide range of uses, utility, easy to color, some high temperature <7> storage of goods can play a moisture-proof effect.