Calumet's CALTRAN Transformer Oils: Premium Electrical Insulating Fluids

Calumet's CALTRAN line offers over 25 years of experience in producing refined, stable electrical insulating fluids designed to meet international standards, helping with reliable performance in electrical applications.
April 6, 2026
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Calumet has more than 25 years of experience in producing highly refined, clean, and stable electrical insulating fluids. The CALTRAN line of naphthenic transformer oils is a portfolio of customized products, formulated to fully meet specific global electrical industry specifications. CALTRAN transformer oils provide excellent dielectric properties, high thermal stability and resistance to oxidation. They provide rapid heat transfer properties, and meet ASTM D3487 Type I and Type II application specifications. CALTRAN C50 has excellent low temperature fluidity, corrosion control and exceptional insulating properties. It meets or exceeds Canadian Standards Association C50-14 specifications for Class A and Class B, and Type I and Type II insulating oils. 

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