What are the specifications for transformer mineral oil?

Transformer mineral oil specifications typically include a minimum breakdown voltage of 30 kV, a flash point above 140°C, and a viscosity range of 10-20 cSt at 40°C. The oil should have low water content (less than 50 ppm) and a high oxidation stability, indicated by a minimum oxidation stability of 20 hours. Additionally, it must comply with ASTM D3487 standards for electrical insulating oil to ensure optimal performance and safety in power transformers.