Shell Diala S2 ZU-I Dried NGT is a high-purity, uninhibited mineral-based insulating oil offering excellent oxidation stability, low temperature performance, and high dielectric strength for use in transformers and high-voltage electrical equipment.
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Shell Diala S2 ZU-I Dried NGT

Shell Diala S2 ZU-I Dried NGT is a high-purity, uninhibited mineral-based insulating oil offering excellent oxidation stability, low temperature performance, and high dielectric strength for use in transformers and high-voltage electrical equipment.

Category:

Shell Diala S2 ZU-I Dried NGT

Uninhibited electrical insulating oil for transformers and switchgear

  • Manufactured from highly refined mineral oils with high dielectric strength

  • Excellent oxidation resistance for extended oil life and system cleanliness

  • Superior low temperature properties ensure reliable performance in cold conditions

  • Dried and filtered to deliver high breakdown voltage (>60 kV as delivered)

  • Fully compliant with copper corrosion tests (DIN 51353, IEC 62535, ASTM D1275B)

  • Free from polychlorinated biphenyls (PCBs)

  • Suitable for industrial and utility power transformers and electrical installations

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

Global Product Code: 001D8371



Application:

Shell Diala S2 ZU-I Dried NGT is a premium uninhibited transformer oil manufactured using high-purity mineral base oils. It is specifically dried and handled to deliver a low moisture content and high dielectric strength, ensuring reliable insulation and cooling in transformers and associated electrical equipment.

Performance Features & Benefits:

  • Oxidation Stability: Inherently resistant to degradation, reducing sludge formation and extending service life.
  • Cold Temperature Performance: Maintains efficient heat transfer and flow characteristics down to -57 °C.
  • High Breakdown Voltage: As delivered, exceeds 60 kV; after treatment, greater than 70 kV.
  • Non-Corrosive: Complies with DIN 51353, IEC 62535, and ASTM D1275B copper corrosion standards without the need for passivators.

Main Application Areas:

  • Power and distribution transformers
  • Electrical rectifiers, circuit breakers, and switchgears
  • Industrial and utility installations requiring high-purity transformer oil

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 and wash skin thoroughly after contact with used oil.
  • Do not release into drains, soil, or watercourses. Use authorized disposal or recycling channels.
  • Safety Data Sheet (SDS) available via inquiry

Technical Specifications:

Property Typical Value Method
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
Breakdown Voltage (As Delivered) >60 kV IEC 60156
Breakdown Voltage (After Treatment) >70 kV IEC 60156
Dielectric Dissipation Factor @ 90 °C 0.002 IEC 60247
Oxidation Stability (164 h) – Total Acidity 0.9 mg KOH/g IEC 61125 C
Oxidation Stability (164 h) – Sludge 0.3 % IEC 61125 C
Oxidation Stability (164 h) – DDF @ 90 °C 0.1 IEC 60247
Corrosive Sulphur (DIN 51353 / IEC 62535 / ASTM D1275B) Not corrosive Complies

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