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oil varnished silk

oil varnished silk

oil varnished silk

Oil insulation synthet fiber varnish silk cloth is made of silkworm silk and oily insulating varnish. It can be used as the binding and liner insulation in motor and mutual inductor.

Description of Oil Varnished Silk

Oil varnished silk is a yellow wax oily lacquered silk fabric which is uniformly immersed in oily insulating varnish by electrician silk (insulating spinning) by drying and cutting. It has good softness and certain electrical and mechanical properties. With certain electrical and mechanical properties, it can be applied for a long time at 130 °C.

Application of Oil Varnished Silk

Oil varnished silk is suitable for thin-layer wrapping insulation or gasket insulation that requires high dielectric properties in motors and electrical appliances.

Transportation and Storage Condition of Oil Varnished Silk

The storage life is half a year at temp lower than 25degree since delivery. The oil varnish cloth may be used if it is tested qualified according to the standard. Product shall be stored in a dry and clean warehouse with good ventilation and away room fire and away from fire and sunshine.

Characteristics of Oil Varnished Silk

Item Model Main Components Characteristics Heat-resistance  Class
Oil Varnished Silk  2210 Silkworm Silk Oily Insulating Varnish Used as the binding and liner insulation in motor and mutual inductor.  A

Technical Data of Oil Varnished Silk

Standard:JB/T 8147-1999                     
Performance Unit  
Thickness mm 0.08 0.1 0.12 0.15 0.18 0.2 0.25
Tensile 
Strength
Warp Direction (min value) N/10 mm ≥16 ≥18 ≥20 ≥24 - - -
Weft Direction (min value) ≥10 ≥12 ≥14 ≥18 - - -
45° Angle (min value ) ≥10 ≥12 ≥14 ≥18 - - -
Breakdown Voltage 23±2℃  (median) KV ≥4.8 ≥5.8 ≥7.2 ≥8.7 - - -
In wetting state at 23±2℃ ≥2.3 ≥3.5 ≥4.1 ≥4.7 - - -
105±2℃(median) ≥3.0 ≥4.3 ≥5.2 ≥5.8 - - -
6% extension at 45ºangle ≥2.7 ≥4.1 ≥5.0 ≥6.1      
Thermoplasticity 70 士2℃ thermal treatment for 24h, no bonding between the varnish
silk layers, and no fall-off of the film
Influence of oil on glass varnish cloth (105 士2℃, in 45# transformer oil, 18h) No bonding between the
varnish silk layers, and no fall-off of the film

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