Calumet Specialty Products Partners, L.P. products

Calumet Specialty Products Partners, L.P. produces naphthenic and paraffinic base oils by using a multistage hydrotreating process operating at pressures above 2500 psi. This process offers the unique ability to produce base stocks that meet currently established performance standards.

Calumet has more than 25 years of experience 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 specifications – thus providing customers flexibility in choosing the transformer oils that meet their specific requirements. Calumet is a long-standing participant in the Annual DOBLE Survey on transformer oil.