Brand
Shell
Type
Transformer & dielectric oils
Primary standard
Indeplineste GB 2536-2025
Manufacturer code
001E8701

Diala S4 ZX-I

Premium inhibited electrical insulating oil, virtually sulphur-free, for power transformers

Specifications

Brand
Shell
Manufacturer code
001E8701
Availability
On order

Manufacturer's description

Shell Diala S4 ZX-I is a biodegradable electrical insulating oil from Shell designed to meet the challenges presented by the latest power transformers. It offers an extended oil life with 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 excellent antioxidant response. In addition, they are available globally and are free from PCBs, DBDS and passivators. Shell Diala S4 ZX-I passes both the established and the new industry copper corrosion tests.

Performance & benefits

  • Extended oil lifeShell Diala S4 ZX-I is a fully inhibited oil offering outstanding oxidation performance and an extended oil life. Shell Diala S4 ZX-I is also suitable for use in highly loaded applications.
  • Transformer protectionShell 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 passes all the relevant copper corrosion tests, namely DIN 51353 (Silver Strip Test), ASTM D1275, and also the latest, more severe tests: IEC 62535 and ASTM D1275B. *Sulphur content below the 1 ppm detection limit of ASTM D5185
  • System efficiencyThe oil's good low-temperature properties ensure adequate heat transfer inside the transformer, starting from even the lowest temperatures. Shell Diala S4 ZX-I is specially dried and handled to achieve a low water content and maintain a high breakdown voltage at the point of delivery. This allows it to be used in many applications without further treatment. The need for further drying and treatment should be assessed according to the application and the OEM specifications.
  • Biodegradable according to OECD 301BShell Diala S4 ZX-I exceeds 60% biodegradation in the OECD 301B test after 28 days.
  • IEC 60296 (Edition 5, year 2020); Type A, fully inhibited, high-grade oil
  • IEC 60296 Ed4 (2012): Table 2 Transformer Oil (I) (Inhibited oil) Section 7.1 ("Higher oxidation stability and low sulphur content")

Standards & approvals

  • Indeplineste GB 2536-2025
  • Siemens Energie (inclusiv aplicatii HVDC )
  • Hitachi Energie
  • ENGIE Laborelec (LPS 05/2020) Specification
  • DOBLE TOPS performanta (inhibata)
  • GE Grid Solutions
  • TBEA, TWBB, SPECO, Huapeng Transformers, Xian XD
  • ASTOR, BEST
  • MR (Maschinenfabrik Reinhausen)
  • SGB-SMIT
  • HYOSUNG

Approved for

  • Hitachi
  • Siemens
  • GE

Typical characteristics

PropertyTypical valueMethod
AppearanceIndeplinesteIEC 60296
Density la 20 °Ckg/m3805ISO 3675
Kinematic viscosity @40°Cmm2/s9.8ISO 3104
Kinematic viscosity @-30°Cmm2/s438ISO 3104
Flash point°C191ISO 2719
Pour point°C-45ISO 3016
Neutralisation value mg<0.01IEC 62021-1
Interfacial Tension @25°C mNm51ASTM D971
ColourL0.5ISO 2049
Total sulphur content mg/kg< 10ASTM D5185
Corrosive sulphurnecorozivDIN 51353
Sulphur potential corozivnecorozivIEC 62535
Corrosive sulphurnecorozivASTM D1275 B
Breakdown voltage- kV50 - 60IEC 60156
Tensiunea de strapungere - kV78IEC 60156
Factor de disipare Dielectric la 90 °C DDF0.001IEC 60247
Oxidation stability 500 hours /PassIEC 61125 C Section
Total acidity mg KOH/g0.02IEC 62021-1
Residue%m0.01IEC 61125 C
Factor de disipare Dielectric0.001IEC 61125 C
Breakdown voltage - kV14IEC 60156
content apa (vrac) mg/kg10IEC 60814
content de 2-Furfural si mg/kgindeplinesteIEC 61198
DBDS content mg/kgindeplinesteIEC 62697-1
Aditivi pasivatori de metal mg/kgindeplinesteIEC 60666
content inhibitor de Oxidation % masa0.2
content de PCA % masaindeplinesteIP346
content de PCB mg/kgindeplinesteIEC 61619

Complete documentation

We email you the sheets listed below in a single archive. No account, no order required.

  • TDSROOctober 2025
  • SDSENAugust 2026
  • SDSROAugust 2026

Where should the files go?

We send the archive to the address below. It is the only field we need — the rest only help us reach you if a sheet is missing.

What you get

    Str. Soporului, nr. 12, Cluj-NapocaContactAbout us
    RO