HP Transformer Oil I is a high-quality uninhibited transformer mineral oil formulated to meet the requirements of IS 335 (2018) for uninhibited types, making it well-suited for electrical distribution transformers, switch-gear, and other insulating oil applications. The oil is clear and free from suspended matter or sediments, with a density of 0.8279 g/cc at 29.5 °C and kinematic viscosities of 16.46 cSt at 27 °C and 11.76 cSt at 40 °C, indicating excellent flow and cooling performance. It boasts a flash point of 148 °C and a pour point of -18 °C, enabling safe operation across a wide temperature range. The neutralisation value (total acidity) is nil, and the oil is classified non-corrosive for sulphur, ensuring safe contact with copper and other metal surfaces. Its dielectric strength of 72 kV, together with a dielectric dissipation factor of 0.00025 at 90 °C, demonstrates strong insulation capability, while specific resistance values of 750×10¹² ohm-cm at 90 °C and 7650×10¹² ohm-cm at 27 °C reinforce its suitability for high-voltage equipment. The oil exhibits outstanding oxidation stability, with zero sludge formation and negligible acid build-up in accelerated tests, extending transformer service life and reducing the need for frequent oil changes. In summary, HP Transformer Oil I provides reliable insulation, excellent thermal stability, and long-term protection for power-equipment applications where an uninhibited mineral oil is required.
| Appearance | Clear, transparent, free from suspended matter or sediments |
|---|---|
| Density @ 29.5°C, g/cc | 0.8279 |
| Kinematic Viscosity, cSt | 16.46 @ 27°C ; 11.76 @ 40°C |
| Flash Point, Pensky-Martens Closed, °C | 148 |
| Pour Point, °C | -18 |
