Glass insulator not only have a delicate appearance and stable quality, but also support high voltage transmission lines.
A suspension string can be made suitable for any voltage level.

| IEC designation |
U40B/110 |
| Diameter D |
mm |
175 |
| Height H |
mm |
110 |
| Creepage distance L |
mm |
185 |
| Socket coupling |
mm |
11 |
| Mechanical failing load |
kn |
40 |
| Mechanical routine test |
kn |
20 |
| Wet power frequency withstand voltage |
kv |
25 |
| Dry lightning impulse withstand voltage |
kv |
50 |
| Impulse puncture voltage |
P.U |
2.8 |
| Power frequency puncture voltage |
kv |
90 |
| Radio influence voltage |
μv |
50 |
| Corona visual test |
kv |
18/22 |
| Power frequency electric arc voltage |
ka |
0.12s/20kA |
| Net weight per unit |
kg |
2.1 |