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Electro-technical sheet glass-fabric laminate type 121 of grade СТ, СТ-1
Electro-technical sheet glass-fabric laminates have found a wide application in many branches of the national economy as electric insulating material at voltage up to 1000 V and frequency 50 Hz for open-air activity with outside relative humidity(relative air humidity -45-47%, at 15-35º C).
Continuous working temperature: from -65ºC to +130ºC.
- sheets with a width of up to 900 mm, length up to 1400 mm; thickness ranging from 0.5 to 50mm;
- articles of different shapes and configurations;
- cylindrical items with a diameter ranging from 20 to 500 mm and a length up to 1000 mm;
Mechanical-and-physical properties Of Glass-fabric laminate
| Item | Requirements acc.to ГОСТ-12562-74 | |||
|---|---|---|---|---|
| СТ | СТ-1 | |||
| Higher grade | First grade | Higher grade | First grade | |
| Density, kg/cm2 | 1600-1300 | 1600-1850 | 1600-1800 | 1600-1850 |
| Cross-breaking strength, flatwise,MPa, not less | 200 | 95 | 200 | 100 |
| Tensile strength, MPa, not less | 100 | 70 | 100 | 75 |
| Impact strength, notched, Charpy, edgewise, kJ/m2, not less | Depending on sheet thickness | |||
| Electric strength, flatwise(1 minute checking test) KWt/mm, not less, for sheets with thickness up to 3 mm | ||||
| Specific insulation resistance Ohms, not less, for sheets with thickness up to 8.0 mm, after immersion in water under conditions: 24h/23°C/93% | 110 | 110 | 110 | 110 |
| Insulation resistance after immersion in water under conditions: 24h/23°C/ distilled water, Ohms, not less | 100 | 100 | 100 | 100 |
| Tracking strength, edgewise(1 minute checking test) under conditions: M/90C/ dialectric oil, not less | 20 | 8 | 20 | 8 |
| Water absorbtion(10,mm thk.) mg, not less | 491 | 491 | 491 | 491 |