Shell Diala S2 ZU-I ngt is a high-quality, uninhibited insulating oil formulated from highly refined mineral oils, offering superior oxidation stability, low temperature fluidity, and strong dielectric properties for transformers and high-voltage electrical equipment.
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Shell Diala S2 ZU-I ngt

Shell Diala S2 ZU-I ngt is a high-quality, uninhibited insulating oil formulated from highly refined mineral oils, offering superior oxidation stability, low temperature fluidity, and strong dielectric properties for transformers and high-voltage electrical equipment.

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Shell Diala S2 ZU-I ngt

Uninhibited electrical insulating oil for power transformers and switchgear

  • Produced from highly refined mineral base oils to ensure excellent dielectric performance

  • Offers long service life with strong resistance to oxidation and sludge formation

  • Maintains system efficiency through excellent low-temperature flow characteristics (pour point: –57 °C)

  • Complies with stringent copper corrosion tests including DIN 51353, IEC 62535, and ASTM D1275B

  • Delivered dry and filtered to maintain high breakdown voltage (>30 kV as delivered, >70 kV after treatment)

  • Free of polychlorinated biphenyls (PCBs); requires no passivators

  • Formerly known as: Shell Diala S2 ZU-I non-gasoil tariff

Global Product Code: 001D8373



Application:

Shell Diala S2 ZU-I ngt is a premium-quality, uninhibited transformer oil developed for electrical insulation and efficient thermal transfer in high-voltage power systems. It is engineered to deliver long-lasting performance with excellent oxidation resistance and low-temperature fluidity, while meeting rigorous international specifications for copper corrosion and dielectric strength.

Performance Features & Benefits:

  • Extended Oil Life: Naturally resistant to oxidation, reducing acid and sludge build-up.
  • Low Temperature Efficiency: Excellent pour point of –57 °C ensures reliable operation in cold climates.
  • High Dielectric Strength: Delivered dry to maintain breakdown voltage above 30 kV; exceeds 70 kV after treatment.
  • Non-Corrosive: Fully compliant with modern copper corrosion standards including IEC 62535 and ASTM D1275B, without the use of passivators.

Main Application Areas:

  • Power and distribution transformers
  • Switchgears, rectifiers, and circuit breakers
  • High-voltage electrical equipment in industrial and utility networks

Specifications & Approvals:

  • IEC 60296 (Edition 4.0 – 2012-02), Table 2: uninhibited transformer oils
  • Free from PCBs (polychlorinated biphenyls)

Environmental & Safety Information:

  • Use impervious gloves when handling used oil. Wash thoroughly after skin contact.
  • Avoid release into the environment. Dispose of used oil via authorized channels.
  • Safety Data Sheet (SDS) available via inquiry

Technical Specifications:

Property Typical Value Method
Appearance Clear, free from sediment and suspended matter IEC 60296
Density @ 15 °C 882 kg/m³ ISO 3675
Density @ 20 °C 879 kg/m³ ISO 3675
Kinematic Viscosity @ 40 °C 11.0 mm²/s ISO 3104
Kinematic Viscosity @ –30 °C 1700 mm²/s ISO 3104
Flash Point (PM) 146 °C ISO 2719 / ASTM D93
Pour Point –57 °C ISO 3016
Neutralisation Value <0.01 mg KOH/g IEC 62021-1
Corrosive Sulphur (DIN 51353) Not corrosive Complies
Corrosive Sulphur (IEC 62535) Not corrosive Complies
Corrosive Sulphur (ASTM D1275B) Not corrosive Complies
Breakdown Voltage (As Delivered) >30 kV IEC 60156
Breakdown Voltage (After Treatment) >70 kV IEC 60156
Dielectric Dissipation Factor (DDF) @ 90 °C 0.002 IEC 60247
Oxidation Stability – Total Acidity (164 hrs @ 120 °C) 0.9 mg KOH/g IEC 61125 C
Oxidation Stability – Sludge (164 hrs @ 120 °C) 0.3 % IEC 61125 C
Oxidation Stability – DDF @ 90 °C (164 hrs) 0.1 IEC 60247

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