Phillips 66® Hydrokool HD is a premium quality, water-soluble, synthetic coolant developed for medium- to heavy-duty turning, milling, and grinding of ferrous metals, as well as grinding and light-duty machining of copper and copper alloys. It contains biocide and mixes easily with soft or hard water to form a high-quality synthetic metalworking fluid that provides excellent cooling properties and lubricity for maximum tool life and high-quality surface finishes on the machined parts.

You are currently viewing HYDROKOOL™ HD

Features & Benefits

  • Excellent cooling and lubricating properties
  • Helps extend cutting tool life
  • Reduces grinding wheel wear
  • Good surface finish
  • Excellent rust protection
  • Non-corrosive to non-ferrous metals
  • Resists bacterial degradation
  • Transparent for good visibility of the machining operation
  • Mixes easily with water


  • Hydrokool HD is recommended for medium- to heavy-duty machining of ferrous metals and metal alloys, and with water hardness greater than 350 ppm. Typical applications include:
  • Broaching (light-duty) / Reaming
  • Drilling / Sawing
  • Grinding / Tapping
  • Milling / Turning

Technical Details

  • Specific Gravity @ 60°F: 1.05
  • Licenses & Approvals

    Hydrokool HD also is recommended for light-duty grinding and machining of copper and copper alloys. It is not recommended for machining aluminum or aluminum alloys, as it can cause staining of some aluminum alloys.

    Additional Details

    Specific Gravity @ 60°F 1.05
    Density, lbs/gal @ 60°F 8.74
    Color, ASTM D1500 3.5
    Boiling Point, °C (°F) 100 (212)
    Flash Point (COC), °C (°F) N/A(2)
    Freezing Point, °C (°F) 0 (32)
    pH, 5% (1:20) dilution 9
    Water, wt % 60
    Chlorine(3), wt % 0.07
    Fatty Oil, wt % Nil
    Sodium, wt % 0.2
    Sulfur, Total, wt % Nil
    Sulfur, Active, wt % Nil
Search this website Type then hit enter to search