Transformer Oil

InhibitedElectrical Insulating Oil

Phillips 66®Transformer Oil is a highly refined electrical insulating oil developed for use in oil-immersed transformers, capacitors, tap changers, and circuit breakers where the equipment manufacturer specifi es a Type II inhibited oil meeting ANSI/ASTM D3487-09 requirements.

Features & Benefits

• Excellent insulating properties

• High dielectric strength

• Low power factor

• Resists oxidation and deposit formation

• Excellent low-temperature properties

• Compatible with materials used in transformers

• Does not contain any PCBs


• Oil-immersed transformers

• Circuit breakers & switches

• Fuses

• Tap changers

• Other oil-immersed electrical equipment

Technical Details

Licenses & Approvals

Transformer Oil meets the requirements of the following industry and OEM specifications:

• ANSI/ASTM D3487-09 Type II Inhibited Oil

• British Standard BS 148, Class 1A

• Federal VV-I-530A, Class II Specification

• GE A13A3A2 (10CA)


• International Standard IEC 60296

• NEMA Type II (obsolete)

• Westinghouse Specifi ation PDS 55822AG

Additional Details
ISO Grade10
Specific Gravity @ 60°F0.887
Density, lbs/gal @ 60°F7.39
Color, ASTM D15000.5
Flash Point (COC), °C (°F)160 (320)
Pour Point, °C (°F)-60 (-76)
cSt @ 40°C9.6
cSt @ 100°C2.3
SUS @ 100°F60.3
SUS @ 210°F34
Viscosity Index19
Acid Number, ASTM D974, mg KOH/g<0.01
Aniline Point, ASTM D611, °C (°F)75 (167)
Corrosive Sulfur, ASTM D1275BNon-corrosive
Dielectric Breakdown Voltage (2)
Disc Electrodes, 60 Hz, ASTM D877, kV40
Oxidation Stability, RPVOT, ASTM D2272, minutes280
PCB Content, ASTM D4059, wt %None
Power Factor @ 60 Hz, ASTM D924
@ 25°C (77°F), %0.003
@ 100°C (212°F), %0.074
Water, ASTM D1533, wt %0.0015