SILICONE TRANSFORMER FLUID (SS SF 50TF)
Silicone Transformer oil
SF 50TF Transformer Liquid is suitable for transformers and other electrical equipment designed to operate at high temperatures or at very low temperatures.
SS-SF 50TF Transformer Liquid is a polydimethyl silicone liquid that meets the requirements of: International Electro technical Commission (IEC) 836 "specifications for silicone liquid for electrical purposes" (Silicone Type T-1). ASTM D 4652-92 "silicone fluids for electrical insulation". IEC 1100 – "Classification of insulating liquids according to fire point and net calorific value" (Class K3). With excellent electrical insulation properties over a wide temperature range, combined with high thermal stability, SF 50TF Transformer Liquid is suitable for transformers and other electrical equipment designed to operate at high temperatures or at very low temperatures.
Properties Tested to ASTM 4652-92
| Parameters | Unit | Value |
|---|---|---|
| Appearance | Crystal clear liquid | |
| Density at 25°C (77°F) | kg/dm3 | 0.96 |
| Viscosity at 25°C (77°F) | mm2/s | 0.50 |
| Water content | ppm | 30 |
| Specific heat | kJ/kg.K | 1.51 |
| Thermal conductivity | W/(m.K) | 0.151 |
| Refractive index at 25°C (77°F) | 1.404 | |
| Breakdown voltage | kV | 50 |
| Permittivity at 25°C (77°F) – 50Hz | 2.7 | |
| Dissipation factor at 25°C (77°F) -50Hz | 0.0001 | |
| Volume resistivity at 25°C (77°F) ohm.cm | 1.0x1014 | |
| Flash point open cup | °C | >300 |
| Flash point open cup | °F | >572 |
| Fire point open cup | °C | 370 |
| Fire point open cup | °F | >698 |
Typical Values – Should not be considered as specifications.
STORAGE & HANDLING
It is recommended that normal safety precautions be taken while handling the product. The material should be stored in original containers in a cool place and protected from direct exposure to sunlight.
LIMITATIONS :These products are neither tested nor represented as suitable for medical or pharmaceutical uses.
APPLICATIONS
Test Requirements of transformer fluid in IEC 836
| Property | Test Method | Permissible Values | Typical SF 50TF Values |
| Physical | |||
| Color | 8 | Max 35 | |
| Appearance | 8 | Clear, free from suspended matter and sediment | |
| Density at 20°C (68°F) (kg/dm3) | 9 | 0.995 to 0.970 | |
| Kinematic viscosity at 40°C (104°F) (mm2/s) | 10 | 40 ± 4 | |
| Flash point (°C/°F) (closed cup) 11 | 11 | Min 240/464 | 260/500 |
| Fire point (°C/°F) (open cup 12 ) | 12 | Min 330/626 | 370/698 |
| Refractive index at 20°C (68°F) | 13 | 1.404 ± 0.002 | |
| Pour point (°C/°F) 15 Max -50/-58 | 15 | Max -50/-58 | 370/698 |
| Chemical | |||
| Water content (mg/kg) 16 Max 50 30 | 16 | Max 50 | 30 |
| Neutralisation value (mg KOH/g) 17 Max 0.02 0.008 | 17 | Max 0.02 | 0.008 |
| Electrical | |||
| Breakdown voltage (kV) 19 Min 40 50 | 19 | Min 40 | 50 |
| Dielectric dissipation factor (tg) at 90°C | |||
| (194°F) and 50 Hz | 20 | Max 0.001 | 0.0005 |
| Permittivity at 90°C (194°F) 20 | 20 | 2.55 ± 0.052 | |
| d.c. resistivity at 90°C (194°F) (G ohm.m) 20 Min 100 1000 | 20 | Min 100 | 1000 |
Test methods are described in IEC 836.
Transformer Liquid complies with all of the requirements of IEC 836 Silicone Type T-1. The above typical values EXCEED the minimum requirements of IEC 836.