HYDROCAL™ products are naphthenic base oils produced exclusively by Calumet using a multi-stage hydrotreating process operating at pressures above 2500 psi. This process offers the unique ability to produce naphthenic base stocks that meet currently established performance standards as well as standards to be developed in the future.

Calumet HYDROCAL naphthenic base oils are ideal across a broad range of industrial applications, including metalworking fluids, heat transfer fluids, hydraulic oils, compressor oils, gear oils and aviation hydraulic fluids.

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The HYDROCAL refining process selectively saturates large cyclical aromatic subgroups that result in the production of very high-quality, stable base stocks. The HYDROCAL product line passes the IP346 Standard and does not require labeling as carcinogenic under the OSHA Hazard Communication Standard.

Learn more about our HYDROCAL products by downloading our brochure.


  • HYDROCAL 100

  • HYDROCAL 500

  • HYDROCAL 750
  • HYDROCAL 1200

  • HYDROCAL 2400
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