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Shell Diala S4 ZX-I

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Shell Diala S4 ZX-I previous Shell Diala B, S2 ZX-I

Premium insulating oil based on Shell GTL technology for transformers

Advantages of the Diala S4 ZX-I are:

  • + High Performance, excellent heat transfer and dielectric properties
  • + High Oxidation Stability
  • + Resistance to the effects of ageing, sludge formation and deposit build-up

Shell Diala S4 ZX-I is Shell's premium insulating oil. It has been designed to meet the needs of the latest transformer generation. The product offers a longer oil life. It is sulfur free and therefore meets existing and future copper corrosion tests. Shell Diala S4 ZX-I is made from a sulfur-free base oil produced using the Shell GTL (Gas-to-liquids) technology. This base oil is characterized by a uniform molecular structure and a very good response of antioxidants. It is globally available and independent of different crude oil deposits due to its manufacturing process. Shell Diala S4 ZX-I is free of PCB, DBDS and Passivators.

Product Description


Features Shell Diala S4 ZX-I

+ Extended oil life

Shell Diala S4 ZX-I is an inhibited insulating oil that performs exceptionally well in industry-standard oxidation tests and provides extended oil life. It is particularly suitable for use in high-load applications.

+ transformer protection

Shell Diala S4 ZX-I is made from a sulfur-free * base oil, which significantly reduces the risk of copper corrosion, even without the addition of passivators or other additives.
All relevant copper corrosion tests are met: DIN 51353 (silver strip test), ASTM D1275 and the new tests IEC 62535 and ASTM D1275B. More reliability due to a higher flash point. * Sulfur content is below 1 ppm (detection limit of · ASTM D5185).

+ System Efficiency

The very good flowability at low temperatures of Shell Diala S4 ZX-I enables safe heat transfer in transformers, even at low starting temperatures.
Shell Diala S4 ZX-I is manufactured and dried by a special process, which gives it a low water content and a high breakdown voltage on delivery. This allows the use of the oil without additional "drying" in many applications.

Specifications, Approvals and Recommendations

- IEC 60296 (2012): Table 2 Transformer Oils (I) (Inhibited Oils) Section 7.1 ("High Oxidation Stability & Low Sulfur Content")
For a list of all OEM approvals and recommendations, please contact your Shell representative.

Analysis figures and physical properties Shell Diala S4 ZX-I

Properties Method IEC Table 2 + section 7.1 minimum IEC Table 2 + section 7.1 maximum Shell Diala S4 ZX-I Typical
Appearance IEC 60296 Clear, free of sediment and suspended matter /s Clear, free of sediment and suspended matter Fulfills
Density at 20C ISO 3675 - 895 805
Kinematic viscosity at @ 40 C mm 2 /s ISO 3104 - 12 9.9
Kinematic viscosity at -30 C mm 2 /s ISO 3104 - 1 800 523
Flash point P.M. C ISO 2719 135 - 191
Freezing point ISO 3016 - - 40 - 42
Neutralization value mg KOH /g IEC 62021-1 - 0.01 0.01
Total Sulfur Content mg /kg ASTM D5185 - Section 7.1 limit 500 1
Corrosive Sulfur DIN 51353 - Not corrosive Not corrosive


Questions and Answers

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Q: Is this oil Shell Diala S4 ZX-I is usable to insulate high frequency high voltage ferrite core SMPS transformer.

Posted On: 10/05/2020 By: Showrov

A: Our specialists have no direct experience with this application. Can answere please these questions: 1) What are the homologations that are requested? 2) Which product is currently used? 3) What volume are we talking about (they seem like very small components)? If we had an answer to these questions, we might be able to stick a product on it.

Additional Information

Additional Information

Brand Shell
ACEA DIN ISO OEM ASTM D 1275B, DIN 51353 (Silver Strip Test), IEC 60296 (2003) tabel 2 ongedoopte transformator olie (U), IEC 62535
OEM Approval siemens, wartsila
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