What are the key properties of Shell Diala DX transformer oil?

Shell Diala DX is generally positioned as a mineral insulating oil designed for electrical equipment requiring stable dielectric performance and good oxidation resistance. Key properties typically targeted include high dielectric strength, low moisture content, low dielectric dissipation factor, adequate resistivity, controlled viscosity for cooling, and compliance with applicable mineral oil standards. Some product variants may be inhibited to improve oxidation stability. Exact specification values depend on the specific Diala DX grade and the datasheet, and utilities normally require certificate of analysis for each batch delivered.