Shell Diala S2 ZU-I Dried GT is an uninhibited electrical insulating oil derived from highly refined mineral oils, offering high breakdown voltage, excellent oxidation stability, and non-corrosive performance for use in transformers and electrical equipment.
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Shell Diala S2 ZU-I Dried GT

Shell Diala S2 ZU-I Dried GT is an uninhibited electrical insulating oil derived from highly refined mineral oils, offering high breakdown voltage, excellent oxidation stability, and non-corrosive performance for use in transformers and electrical equipment.

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Shell Diala S2 ZU-I Dried GT

Uninhibited mineral-based transformer oil for electrical insulation and heat transfer

  • Manufactured from high-quality refined mineral oils with excellent dielectric properties

  • Offers long oil life through strong resistance to oxidation and sludge formation

  • Delivers reliable transformer cooling via outstanding low-temperature fluidity

  • Dried to achieve high breakdown voltage (>60 kV as delivered)

  • Non-corrosive towards copper — passes DIN 51353, ASTM D1275B, and IEC 62535 corrosion tests

  • Enables use without further drying in many industrial applications

  • Meets IEC 60296 (Edition 4.0, 2012-02), Table 2 (Uninhibited transformer oils)

  • Suitable for grid transformers, switchgears, rectifiers, and electrical circuit components

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

Global Product Code: 001D8370



Application:

Shell Diala S2 ZU-I Dried GT is a premium-grade uninhibited electrical insulating oil developed for use in power and distribution transformers, switchgears, rectifiers, and circuit breakers. It is derived from specially refined mineral base oils and designed for high dielectric strength, reliable thermal performance, and extended oxidation resistance, even in cold climates.

Performance Features & Benefits:

  • Extended Oil Life: Inherent resistance to oxidation reduces sludge formation and prolongs service life.
  • System Efficiency: Excellent low-temperature flow properties ensure proper heat transfer from startup to high-load operation.
  • High Breakdown Voltage: Dried and handled to deliver >60 kV dielectric strength as delivered; >70 kV after treatment.
  • Non-Corrosive: Fully compliant with DIN 51353, ASTM D1275B, and IEC 62535 corrosion tests without need for passivators.

Main Application Areas:

  • Power and distribution transformers
  • Rectifiers and electrical switchgears
  • Industrial and utility electrical installations

Specifications & Approvals:

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

Environmental & Safety Information:

  • Shell Diala S2 ZU-I Dried GT is not expected to pose significant health or safety hazards under recommended use.
  • Use impervious gloves. Avoid skin contact with used oil and wash with soap and water after handling.
  • Prevent release into the environment. Use designated disposal or recycling collection points.
  • Safety Data Sheet (SDS) available via inquiry

Technical Specifications:

Property Typical Value Method
Density @ 15 °C 878 kg/m³ ISO 3675
Density @ 20 °C 875 kg/m³ ISO 3675
Kinematic Viscosity @ 40 °C 9.4 mm²/s ISO 3104
Kinematic Viscosity @ –30 °C 940 mm²/s ISO 3104
Flash Point (PM) 144 °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 (DDF) @ 90 °C 0.002 IEC 60247
Oxidation Stability (164h) – Total Acidity @ 120 °C 0.9 mg KOH/g IEC 61125 C
Oxidation Stability (164h) – Sludge @ 120 °C 0.3 % IEC 61125 C
Oxidation Stability (164h) – DDF @ 90 °C 0.1 IEC 60247
Corrosive Sulphur (DIN 51353 / IEC 62535 / ASTM D1275B) Not corrosive Complies

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