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About composite suspension insulator:
Composite Suspension Insulator also known as "composite long rod insulator" The term ''long rod'' is actua lly used for a specific design of porcelain insulator which was first introduced in Germany in the 1920s as an alternative to cap-and-pin insulators (and also for critical ambient conditions, for example high pollution).
Composite long rod insulators benefit from the manufacturing possibilities ofthe FRP (fibre reinforced plastic) rod, and in particular from the fact that FRP rods can be produced practically endlessly in one piece in lengths of up to 20 m which is not possible with conventional insulator materials such as porcelain and glass.
Composite long rod insulators are currently produced in lengths of 10-100 cm for low-voltage and medium-voltage network systems, and in lengths up to 10m and more for today's UHV network systems

Advantages of composite insulator:
1:Composite insulator has high strength, light weight.Can relieve stress, reduce the installation and     maintenance of tower of strength, save costs.Because the rod core with tensile strength is high so the composite insulator can be very handy.
2:It aging resistance, good.Composite insulator has good corrosion resistance,aging resistance, at 70 degrees Celsius is elastic, can be long - term work 20 degrees celsius.
3:It has the advantages of small volume, light weight.Because the composite insulator has the advantages of small volume, light weight, and the umbrella disk is flexible, not easy to damage,so it brings great convenience to the transportation, installation, maintenance

Material available:
1.Silicon rubber, composite polymer
2.Glass-fiber reinforced epoxy resin rod
3.Hot-dip galvanized steel