Idemitsu Transformer Oil G General-Purpose Mineral Electrical Insulating Oil
Transformer Oil G is a mineral-oil-based electrical insulating oil from Idemitsu. The official product literature states that the series is highly refined using proprietary technology, with impurities thoroughly removed to provide high resistivity and excellent dielectric breakdown performance. It is suitable for a broad range of electrical applications from distribution equipment to high-voltage transformers. Idemitsu specifically identifies the G grade as a general-use transformer oil. Typical properties include a density of approximately 0.8790 g/cm³ at 15°C, a kinematic viscosity of about 8.25 mm²/s at 40°C, a pour point of about -32.5°C, and a flash point of about 144°C by Pensky-Martens. The oil also provides strong electrical insulation characteristics. Typical dielectric breakdown voltage is approximately 74 kV with spherical electrodes at a 2.5 mm gap, while volume resistivity at 80°C is about 40 TΩ·m. Its low acidity and good oxidation resistance support long-term service in transformer systems.
Product Details
Product Features
Excellent Electrical Insulation:High resistivity and dielectric breakdown strength provide reliable insulating performance.
Good Thermal Stability:Carefully selected and highly refined mineral oils offer good heat and oxidation resistance for long-term operation.
Low Electrostatic Charging Tendency:Idemitsu highlights excellent low static-electrification performance in its transformer-oil series.
Low Acidity:Typical acid value is below 0.01 mgKOH/g.
Good Low-Temperature Fluidity:Typical pour point is approximately -32.5°C for the G grade.
100% Mineral Oil System:The current SDS confirms a fully mineral-oil-based formulation.
Product Applications
Distribution Transformers:For electrical insulation and heat transfer in distribution systems.
Power Transformers:Suitable as an insulating and cooling medium in general power transformers.
Switchgear:Can be used in electrical equipment requiring mineral insulating oil.
General High-Voltage Electrical Equipment:Suitable for a broad range of insulating-oil applications; for ultra-high-voltage service, Idemitsu also offers specialized grades such as Transformer Oil H.
| Item | Transformer Oil G |
|---|---|
| Product Type | Mineral Electrical Insulating / Transformer Oil |
| Brand | Idemitsu |
| Model | Transformer Oil G |
| Official Positioning | General-Purpose Transformer Oil |
| Base Oil System | Mineral Oil |
| Total Mineral Oil Content | 100 wt% |
| Main Composition | 70–80% Hydrogenated Low-Viscosity Paraffinic Oil / 20–30% Solvent-Refined Low-Viscosity Naphthenic Oil |
| ASTM Color | L0.5 |
| Density at 15°C | Approx. 0.8790 g/cm³ |
| Kinematic Viscosity at -30°C | Approx. 457.5 mm²/s |
| Kinematic Viscosity at 0°C | Approx. 44.86 mm²/s |
| Kinematic Viscosity at 40°C | Approx. 8.25 mm²/s |
| Kinematic Viscosity at 100°C | Approx. 2.23 mm²/s |
| Pour Point | Approx. -32.5°C |
| Flash Point | Approx. 144°C, PM |
| Acid Value | ＜0.01 mgKOH/g |
| Corrosive Sulfur | Non-Corrosive |
| Water Content | Approx. 7 ppm |
| Dielectric Breakdown Voltage | Approx. 74 kV, spherical electrodes, 2.5 mm gap |
| Dielectric Dissipation Factor | Approx. 0.001% at 25°C |
| Volume Resistivity at 80°C | Approx. 40 TΩ·m |
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