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Excellent grade Glass/Epoxy material made with vacuum casting |
CORONALESS is made through the process that epoxy resin is impregnated into glass fabric in a vacuum cast mold and then thermal cured.Therefore air bubbles which cause partial discharge (Corona) can not be involved in.
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▲CORONALESS (Pipe) |
▲CORONALESS (Pipe and Board) |
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▲Actuating shaft made of CORONALES
Square shaft is also available with machining a board into a square bar. |
Epoxy resin is vacuum impregnated into glass fabric so entirely that CORONALESS appears to be translucent. |
■Properies |
- Excellent in flatwise insulation property.
- Reliable under high voltage and/or high current.
- Suitable for insulation parts installed in the place where air tightness or oil tightness are required.
- Excellent in mechanical strength.
- Durable for use under such low temperature as liquid Helium.
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■Applications |
- Actuating shaft of Gas blast circuit breaker,Air blast circuit breaker or Vacuum circuit breaker.
- Insulation cylinder or actuating shaft of small size Oli circuit breaker.
- Actuating shaft of small size Magnetic blast circuit breaker.
- Actuating shaft or insulation cylider of transformer tap changer.
- Insulation board of silicon rectifier.
- Insulation rod for wiring.
- Insulation Bolt & Nut
- Frange of freeze container with double layer structure.
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■General properties |
| Test items |
Unit |
Condition |
ER-5000
Glass fabric base |
ER-5600
Glass roving fabric base |
| Flatwise withstand voltage (1min) |
In oil |
MV/m |
C-90/20/65 |
16 |
16 |
| Flatwise break voltage ( 1min) |
MV/m |
20< |
20< |
| Edgewise withstand voltage (1min.) |
kV/6mm |
O-0.5/90 |
9 |
9 |
| Edgewise break voltage (1min.) |
30< |
30< |
| Insulation resistance |
Accept state |
MΩ |
C-90/20/65 |
108～109 |
108～109 |
| Heating treatment |
MΩ |
C-90/20/65
+D-2/100 |
105～108 |
5×103～104 |
| Volume resistivity |
MΩ/cm |
C-90/20/65 |
5×108～1010 |
5×108～1010 |
| Surface resistivity |
ＭΩ |
5×108～1010 |
5×108～1010 |
| Dielectric constant (60Hz) |
- |
4～5 |
4～5 |
| Dissipation factor (60Hz) |
一 |
0.001～0.003 |
0.001～0.003 |
| Tensile strength |
MPa |
A |
294～392 |
343～441 |
| Flexural strength |
Crosswise |
MPa |
392～441 |
490～588 |
| Compressive strength |
Lengthwise |
MPa |
245～294 |
245～294 |
| Crosswise |
MPa |
441～540 |
392～490 |
| Water absorption |
% |
E-24/50
+D-24/23 |
0.02> |
0.03> |
| Specific gravity |
- |
A |
1.8 |
1.8 |
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- The above figures show one of test results based on JIS K 6911.
- Condition: A = Accept state, C = Constant temp.and hum.,D = Dipping in water, E=Heating ,O=Oil dipping
- Figures typed after condition show Time/Temp./Hum.
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■Representative size of pipe |
| Bore (mm) |
Outside diameter (mm) |
Length (mm) |
| 12～999 |
17～1040 |
1000 / 1200 |
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■Representative size of board |
| Thickness (mm) |
Width (mm) |
Length (mm) |
| 5～50 |
500 / 1000 |
1000 / 1100 / 1200 |
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