The Definition of Insulators
The substance with not good conduction current is called insulator, and it is also called the dielectric guide. Their resistivity is high. There is no absolute boundaries. Insulator under certain conditions can be transformed into the conductor. Either solid or liquid, internal if there is a freely moving electrons or ions, then he would be conducting. No free moving charge, under certain conditions, it can produce conductive particles, so it can also be a conductor.
Species of Insulators
There are many kinds of solid insulators, such as plastic, rubber, glass and ceramics; liquid such as various natural mineral oil, silicone oil, three chlorine biphenyl; gas such as air, carbon dioxide, sulfur hexafluoride. There are many kinds of insulators, including polymer insulators. Normally, gas is a good insulator. In some special conditions, it will be converted into conductor insulator. 
The Characteristics of Insulators
Insulator under certain conditions, such as heating, high pressure under the influence, it will be "breakdown", which translates into the conductor. The insulator breakdown is also not conductive object. If the insulation material applied on both ends of the voltage, the material will appear weak current. The insulating material is usually only a trace of free electrons without breakdown before participating in the conductivity of charged particles is dominated by thermal motion and dissociation from intrinsic ion and impurity. Insulator electrical properties are reflected in the conductivity, polarization, loss and the breakdown process. An insulator is material that can prevent heat (thermal insulator) or electric (electrical insulator) flow. The post insulator can be also used in this principle. Electrical insulator relative material is conductive and semiconductive, and they can take charge of patency of the flow (Note: in the strict sense, the semiconductor is an insulator, at low temperatures because it can stop the flow of electric charge, except in semiconductor doped with other atoms, which can release the excess charge to carry current). The term electrical insulators and dielectrics has the same meaning, but the two terms are used in different fields. A complete sense of heat insulator, according to the second law of thermodynamics is not possible. However, there are some material (such as silicon dioxide) is very close to the real electrical insulator. A larger class of materials for home and office wiring are perfect with no safety hidden trouble, and the efficiency is very high.
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