Goldenstone® Trafo A HOSIO insulating oil is formulated from a severely hydrotreated naphtenic oil additized with phenolic type antioxidant. It is designated for use in high voltage electrical equipment such as transformers, circuit breakers (switches) etc., demanding a lubricant with special characteristics as insulating and heat-transfer media.


• Low Sulphur content
• Very good heat transfer characteristics
• Maximum resistance to degradation
• Very good low temperature properties
• High dielectric strength
• Extremely good oxidation stability