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Insulator

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1.No flaw,crack in the surface and interior  ,each bar color uniform(green or light yellow).

2.Can withstand the sawing,milling,planning,drilling,lathe and other mechanical processing.

3.Internal thread can be tapping with screw tap,external thread can be polished,but not allowed to bear overload.

4.It has good damping,creep resistance,fatigue resistance,fracture resistance ,high temperature resistance,stress corrosion resistance etc.

ANSI CLASS With long stud 57-1L 57-2L 57-3L 57-4L 57-5L
With short stud 57-1S 57-2S 57-3S 57-4S 57-5S
Fig. No. 1 2 3 4 5
Creepage Distance (mm) 356 559 737 1016 1143
Dry Arcing Distance (mm) 165 241 311 368 430
Cantilever Strength(kN) 12.5 12.5 12.5 12.5 12.5
Power Frequency

Flashover Voltage

Dry /kV 70 100 125 140 160
Wet/kV 50 70 95 110 130
Critical Impulse

Flashover Voltage

Positive/kV 120 160 200 230 265
Negative/kV 155 205 260 340 380
Radio

Influence voltage

Test Voltage to ground/kV 15 22 30 44 44
Maximum RIV at 1MHz/uV 100 100 200 200 200

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