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Twin Specialties' line of transformer oils are recommended for use in grid and industrial transformers and electrical equipment components.

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Shell Drum

55 gal Shell Diala S2 ZX-A Transformer Oil
Shell Tote

Bulk Shell Diala S2 ZX-A Transformer Oil
Shell Drum

55 gal Shell Diala S4 ZX-IG Transformer Oil
Quantity N/A 55 gal N/A 330 gal N/A 55 gal
Viscosity at 40ºC N/A 9 cSt N/A 9 cSt N/A 9.4 cSt
Viscosity at 100ºC N/A 2.2 cSt N/A 2.2 cSt N/A 2.7 cSt
Flash Point N/A 150 ºC N/A 150 ºC N/A 158 ºC
Pour Point N/A -57 ºC N/A -57 ºC N/A -42 ºC
Aniline Point N/A 69 ºC N/A 69 ºC N/A 114 ºC
Interfacial Tension at 25ºC N/A 42 dynes/cm N/A 42 dynes/cm N/A 53 dynes/cm
Rotating Pressure Vessel Oxidation Test (RPVOT) N/A 240 min N/A 240 min N/A 650 min
Dielectric Breakdown N/A > 300 (Impulse) kV> 70 (After Treatment) kV40 (As Received) kV N/A > 300 (Impulse) kV> 70 (After Treatment) kV40 (As Received) kV N/A 36 kV
Dielectric Dissipation Factor N/A 0.1 N/A 0.1 N/A 0.001
Total Acid Number N/A < 0.01 @ 72 hours mg KOH/g0.1 @ 164 hours mg KOH/g N/A N/A 0.02 mg KOH/g
72 Hours Sludge by Mass N/A < 0.01 % N/A < 0.01 % N/A 0.01 %
164 Hours Sludge by Mass N/A 0.01 %
Gassing Tendency N/A Complies N/A Complies N/A -5
Oxidation Inhibitor Content N/A Complies N/A Complies N/A 0.2%
PCB Content N/A Not Detectable
Water Content N/A < 30 mg/kg N/A < 30 mg/kg N/A 7 mg/kg
Applications N/A Transformers - Electrical insulating oil for grid and industrial transformers.

Electrical Equipment - Components such as rectifiers, circuit breakers and switchgears.  		N/A Transformers - Electrical insulating oil for grid and industrial transformers.

Electrical Equipment - Components such as rectifiers, circuit breakers and switchgears.  		N/A

Power Plants

Transformers
Features and Benefits N/A Extended Oil Life - Shell Diala S2 ZX-A is an inhibited oil giving outstanding oxidation performance and an extended oil life. 

System Efficiency - The good low temperature properties of the oil ensures proper heat transfer inside the transformer, even from low, starting temperatures.

Transformer Protection - Shell Diala S2 ZX-A is non-corrosive towards copper, with no need for additional passivation. Shell Diala S2 ZX-A meets all relevant tests on copper corrosion ASTM D1275, and also the latest more severe tests: IEC 62535 and ASTM D1275B. 		N/A Extended Oil Life - Shell Diala S2 ZX-A is an inhibited oil giving outstanding oxidation performance and an extended oil life. 

System Efficiency - The good low temperature properties of the oil ensures proper heat transfer inside the transformer, even from low, starting temperatures.

Transformer Protection - Shell Diala S2 ZX-A is non-corrosive towards copper, with no need for additional passivation. Shell Diala S2 ZX-A meets all relevant tests on copper corrosion ASTM D1275, and also the latest more severe tests: IEC 62535 and ASTM D1275B. 		N/A
  • Extended Oil Life: Shell Diala S4 ZX-IG is a fully inhibited gas absorbing oil giving outstanding oxidation performance and an extended oil life. It has the ability to absorb gases such as hydrogen which can develop under partial discharge conditions. This makes Shell Diala S4 ZX-IG the recommended Shell product for special applications with high voltage gradients, such as bushings and instrument transformers requiring gas absorbing properties.
  • Transformer Protection: Shell Diala S4 ZX-IG is manufactured from a zero sulfur* base oil, making it intrinsically non-corrosive towards copper, without the need for passivation or other additives (apart from the DBPC antioxidant, and a low leverl or aromatic hydrocarbon (for gas absorption behaviour)). Shell Diala S4 ZX-IG 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.
  • 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-IG is specially dired 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.

*Sulfur content below 1 ppm detection limit of ASTM D5185
Claims (Meets Requirements) N/A ANSI/ASTM D3487 Type II N/A ANSI/ASTM D3487 Type II N/A ANSI/ASTM D3487 Type II IEC 60296 (Edition 4 year 2012); Table 2 Transformer Oil (I) (Inhibited Oil) Section 7.1 ("Higher Oxidation Stability & Low Sulfur Content") IEC 60296 (Edition 5 year 2020); Type A, Fully Inhibited High Grade Oils
Additional Information N/A Storage Precautions - The critical electrical properties of Shell Diala S2 ZX-A are easily compromised by trace contamination with foreign material. Typically encountered contaminants include moisture, particles, fibers and surfacants. 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 airtight seals. It is further recommended that electrical insulating oils be stored indoors in climate-controlled environments. N/A Storage Precautions - The critical electrical properties of Shell Diala S2 ZX-A are easily compromised by trace contamination with foreign material. Typically encountered contaminants include moisture, particles, fibers and surfacants. 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 airtight seals. It is further recommended that electrical insulating oils be stored indoors in climate-controlled environments. N/A
  • Health & Safety: Shell Diala S4 ZX-IG is unlikely to present any significant health or safety hazard when properly used in the recommended application and good standards or personal hygiene are maintained. Shell Diala S4 ZX-IG 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.
  • Storage Precautions: The critical electrical properties of Shell Diala are easily compromised by trace contamination with foreign material. Typically encountered contaminants include moisture, particles, fibers, 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 climated-controlled environments.
Power Factor at 25ºC N/A N/A N/A 0.001 %
Power Factor at 100ºC N/A N/A N/A 0.001 %