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.