Shell Diala S2 ZU-I gt is an uninhibited mineral-based insulating oil with high oxidation stability, low pour point, and excellent dielectric performance for transformers and high-voltage equipment.
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Shell Diala S2 ZU-I gt

Shell Diala S2 ZU-I gt is an uninhibited mineral-based insulating oil with high oxidation stability, low pour point, and excellent dielectric performance for transformers and high-voltage equipment.

Category:

Shell Diala S2 ZU-I gt

Uninhibited electrical insulating oil for transformers and switchgear

  • Derived from highly refined mineral oils for excellent dielectric strength

  • Maintains stable performance with high resistance to oxidation and sludge formation

  • Ensures system efficiency through reliable low-temperature flow properties (pour point: –57 °C)

  • Non-corrosive towards copper — meets DIN 51353, IEC 62535, ASTM D1275B standards

  • Supplied dried and filtered for high breakdown voltage (>30 kV as delivered, >70 kV after treatment)

  • Free from PCBs and requires no passivators

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

Global Product Code: 001D8372



Application:

Shell Diala S2 ZU-I gt is a high-purity, uninhibited transformer oil designed for electrical insulation and thermal transfer in power transformers, switchgears, circuit breakers, and rectifiers. Manufactured from carefully refined mineral oils, it delivers excellent oxidation stability, corrosion protection, and high breakdown voltage without requiring additives or passivators.

Performance Features & Benefits:

  • Oxidation Resistance: Inherently stable formulation reduces sludge and acid formation over time.
  • Low Temperature Flow: Maintains good heat transfer characteristics even at extremely low ambient temperatures (pour point: –57 °C).
  • High Dielectric Strength: Dried and filtered to exceed 30 kV breakdown voltage as delivered, and over 70 kV after treatment.
  • Copper Non-Corrosivity: Fully compliant with DIN 51353, IEC 62535, and ASTM D1275B, enabling long-term equipment protection.

Main Application Areas:

  • Power and distribution transformers
  • Switchgears and circuit breakers
  • Electrical rectifiers and industrial electrical systems

Specifications & Approvals:

  • IEC 60296 (Edition 4.0 – 2012-02), Table 2: uninhibited transformer oils
  • PCB-free formulation

Environmental & Safety Information:

  • Use impervious gloves when handling used oil. Wash skin thoroughly after contact.
  • Prevent environmental contamination. Dispose of used oil via approved collection points.
  • 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 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
Corrosive Sulphur (DIN 51353 / IEC 62535 / ASTM D1275B) Not corrosive Complies
Breakdown Voltage (As Delivered) >30 kV IEC 60156
Breakdown Voltage (After Treatment) >70 kV IEC 60156
Dielectric Dissipation Factor @ 90 °C 0.002 IEC 60247
Oxidation Stability – Total Acidity @ 120 °C (164 h) 0.9 mg KOH/g IEC 61125 C
Oxidation Stability – Sludge @ 120 °C (164 h) 0.3 % IEC 61125 C
Oxidation Stability – DDF @ 90 °C (164 h) 0.1 IEC 60247

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