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Shell Diala S4 ZX-1 • 209L
Shell Diala S4 ZX-1 • 209L

Shell Diala S4 ZX-1 • 209L

Technical Data Sheet
Material Safety Data Sheet
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Premium Inhibited Electrical Insulating Oil

Shell Diala S4 ZX-I is the new electrical insulating oil from Shell designed to meet the challenges presented by the latest power transformers. It offers an extended oil life with the peace of mind of zero sulphur content. Shell Diala S4 ZX-I is manufactured from zero sulphur base oils produced using Shell’s GTL (gas-to-liquid) technology. These base oils offer a high degree of compositional consistency and have an excellent response to anti-oxidant. In addition they are globally available and free from PCBs, DBDS and passivators. Shell Diala S4 ZX-I meets both the established and new industry copper corrosion tests.

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Performance, Features & Benefits

  • Extended oil life
    Shell Diala S4 ZX-I is a fully inhibited oil giving outstanding oxidation performance and an extended oil life. Shell Diala S4 ZX-I is also suitable for use in highly loaded applications.
  • Transformer protection
    Shell Diala S4 ZX-I is manufactured from a zero sulphur* base oil, making it intrinsically non-corrosive towards copper, without the need for passivation or other additives. Shell Diala S4 ZX-I meets all relevant tests for copper corrosion, namely the established DIN 51353 (Silver Strip Test), ASTM D1275, and also the latest more severe tests: IEC 62535 and ASTM D1275B.

    *Sulphur content below 1ppm detection limit of ASTM D5185
  • System efficiency
    The good low temperature viscometric properties of the oil ensure proper heat transfer inside the transformer, even from very low starting temperatures.

    Shell Diala S4 ZX-I is specially dried and handled to achieve a low water content and retain a high breakdown voltage at point of delivery. This enables it to be used in many applications without further treatment.


Main Applications

  • Transformer
  • Power Plant


Specifications, Approvals & Recommendations

  • IEC 60296 (2012): Table 2 Transformer Oil (I) (Inhibited oil) Section 7.1 (“Higher oxidation stability & low sulphur content”)

    For a full listing of equipment approvals and recommendations, please consult your local Shell Technical Help Desk.


Health, Safety & Environment

  • Health and Safety
    Shell Diala S4 ZX-I is unlikely to present any significant health or safety hazard when properly used in the recommended application and good standards of personal hygiene are maintained.

    Shell Diala S4 ZX-I is free from polychlorinated biphenyls (PCB). Avoid contact with skin. Use impervious gloves with used oil. After skin contact, wash immediately with soap and water.

    Guidance on Health and Safety is available on the appropriate Material Safety Data Sheet
  • Protect the Environment
    Take used oil to an authorised collection point. Do not discharge into drains, soil or water.


Additional Information

  • Storage precautions
    The critical electrical properties of Shell Diala are easily compromised by trace contamination with foreign material. Typically encountered contaminants include moisture, particles, fibres and surfactants. Therefore, it is imperative that electrical insulating oils be kept clean and dry. It is strongly recommended that storage containers be dedicated for electrical service and include air-tight seals. It is further recommended that electrical insulating oils are stored indoors in climate-controlled environments.