Insulator
Name:
Insulator
Detailed information:
Any substance or mixture that has an extremely low dielectric constant, low thermal conductivity, or both. Electrical insulators are either solid or liquid, the latter being used in transformers(askarel, mineral oils, silicone oils). A wide variety of solid types includes porcelains, glass, mica, alumina, various high polymers (epoxies, polyethylene, polystyrene, phenolics), cellulosic materials, nylon, and silicone resins. All these may be used alone or combined with other insulators as composites.See Dielectric; Transformer Oil.Thermal insulators comprise an equally broad range of materials. Such inorganics as mineral fibers, magnesia, aluminum silicate, cellulose, and glass fibers are widely used for steam and hot-water pipes, furnaces, and blown-in home insulation. Organic products that are effective include plastic foams (polyurethane, polyvinyl chloride, polystyrene) and cellular rubber. There are a number of materials that may be called double insulators, since they have both electrical and thermal insulating properties, e.g., polystyrene, PVC, cellulose, glass, magnesia, and aluminum silicate.Air is a unique case, as it is the only gaseous material in actual use as an insulator. Its dielectric constant is 1.0058, far less than that of any other dielectric material, and it has low thermal conductivity as well. It is particularly effective when trapped within a solid network, as in wool, cellular plastics, or glass fibers, or as an interlayer between wall panels.
- ©2008 LookChem.com,License:ICP NO.lookchem:Zhejiang16009103 complaints:service@lookchem.com
-
[Hangzhou]86-571-87562588,87562561,87562573
Our Legal adviser: Lawyer
-