Tulstar Transformer Oil

EVO XFo is a transformer oil created on a biotechnology platform originating from Plant Sugars. EVO XFo will display a high level of oxidative stability, dielectric strength and heat transfer capability over a wide range of temperatures and under heavy electrical stress. As a biodegradable hydrocarbon, EVO XFo is designed to extend the life and value of a transformer. EVO XFo is a mineral oil drop-in that conforms to all ASTM D3487, IEC 60296, and OECD 301B standards.

Transformer Oil Comparison

evo-xfo1

Oxidation Stability Under Electrical Test

evo-xfo2

 

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Property ASTM ASTM D3487

EVO XFo

Mineral Oil
(Type II)

Vegetable Oil

Aniline Point °C 

D-611 

63/84 

113.5 

72.2 

–– 

Color 

D-1500 

0.5 max 

L0.5 

L0.5 

L0.5 

Flash Point °C 

D-92 

145 min 

178 

151 

330 

Interfacial Tension 

   @ 25 °C dynes/cm 

D-971 

40 min

45 

45 

27 

Pour Point °C 

D-97 

-40 max 

-57 

-54 

-21 

Spec. Grav. 15°C/15°C 

D-1298 

0.91 max 

0.818 

0.8938 

0.96 

Viscosity cSt (SUS) 

D-445 

   @ 100 °C 

3.0 max 

3

2.46

7.9

   @ 40 °C 

12.0 max 

11.7 

9.6

32.7

   @ 0 °C 

76.0 max 

64.2 

75.2 

187 

Appearance 

D-4176 

Clear & Bright 

Clear & Bright 

Clear & Bright 

Clear & Bright 

Dielectric Breakdown kv 

D-877 

30 min 

49

40

47 

Gassing Tendency uL/min 

D-2300B 

30 max 

-2 

20 

-79 

Power Factor @ 60 Hz, % max 

D-924 

   @ 25 °C 

0.05 max 

0.001 

0.005 

0.05 

   @ 100 °C

0.30 max 

0.01 

0.114 

–– 

Oxidation Inhibitor Content 

D-2668 

0.3 

0.26 

–– 

Oxidation Stability 

D-2440 

   % Sludge, by Mass

0.1 max 

< 0.01 

0.001 

–– 

Rotary Bomb Oxidation minutes 

D-2112 

195 min 

> 550 

252 

37 

Water ppm 

D-1533 

35 max 

9

10 

55 

Neutralization Number mg KOH/g 

D-974 

0.03 max 

< 0.01 

0.01 

0.03 

All oils marketed by Tulstar conform to the latest corrosive sulfur standards and are certified PCB-free. 

 

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