Sealing Gaskets for Power Oil Transformers

Fluorosilicone Rubber (FVMQ, fluorosiloxane elastomer) when used as gaskets and seals in power oil transformers possess the following advantages:

  • Service life up to 30 years.
  • Resistance to all types of transformer oils. Minimal swelling and permanent compression deformation guarantee no leaks during the entire period of service.
  • Rubber does not contain sulphur. Sulphur is not washed out with oil, followed by precipitation, which dramatically reduces the performance of the transformer.
  • The upper limit of the operating temperature is 2500C.
  • Electrical resistance is hundreds of times higher than in traditional insulating materials.
  • It does not age outdoors.

We are ready to offer our customers both standard seals and their manufacture according to the drawings.

Standard Transformer Seal Types

Sealing cords of round and rectangular section

  • 60 and 70 Shore hardness.
  • Section diameter (for round cords) is from 2 to 50 mm. Side size (for rectangular cords) is from 2 to 40 mm.
  • Supplied in reels of infinite length.

Semi-circular gaskets (typical sizes)

S D d
11 24 12
11 22 12
12 20 8
13 23 10
13 32 20
18 34 16
18 34 18
18 38 20
18 45 27
18 51 33
18 60 42
18 66 48
24 57 33
24 66 42
24 72 48
28 100 72

 

Rectangular gaskets (typical sizes)

h d D
4 10 18
4 27 49
4 45 70
6 28 45
6 36 56
6 52 80
6 65 96
6 78 104
6 90 120
6 110 150
8 42 62
8 45 85
8 255 279
8 315 339
10 58 70
12 45 65

 

Physical and Mechanical Properties of Fluorosilicone Rubber

Density (g/cm2) Hardness
(Shore)
Nominal tensile
strength (МPа)
Elongation at
break (%)
Tear strength
(кN/m)
Compression set %
(22 hours х 170оС х 25%)
Linear contraction (%)
1,39-1,45 58-65 8,0 350 Not less than 14 Not more than 20 3,5-4,0
1,39-1,45 58-65 7,5 300 Not less than 14 Not more than 20 3,5-4,0

Rubber Resistance in Various Environments

Environment Test conditions
(time/temperature)
Hardness
(Shore)
Change of indicators
Tensile Strength (%) Elongation at break (%) Volume (%)
Diesel fuel 1 week / 60оС 8,0 350 Not less than 14 Not more than 20
2 week / 60оС 8,0 350 Not less than 14 Not more than 20
3 months / 60оС 8,0 350 Not less than 14 Not more than 20
IRM 902 Oil 72 hours / 150оС 0 -7 -8 1
IRM 903 Oil 72 hours / 150оС -4 -11 -15 2
ASTM Oil #1 72 hours / 150оС -5 0 -5 0
ASTM Oil #3 7 days / 150оС 1 -3 -6 0
Unleaded gasoline 24 hours / 100оС -11 -16 -29 20
Ethylene glycol 50% 24 hours / 100оС 0 -5 5 0
СЖР-1 72 hours / 250оС -1,5
СЖР-3 72 hours / 250оС 1,9
Didn’t find what you were looking for?
Contact us to get customized solution.
Contact Us