Phillips 66® Hydrokool SS is a premium quality, water-soluble, semi-synthetic coolant developed for general-purpose turning, milling and grinding of steel and high-speed steel alloys. It offers the ease of maintenance found in synthetic coolants plus the economy found in conventional soluble oils.

You are currently viewing HYDROKOOL™ SS

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 SS is recommended for general-purpose machining and grinding of ferrous metals and metal alloys, with water hardness up to 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


    Additional Details

    Specific Gravity @ 60°F 1.05
    Density, lbs/gal @ 60°F 8.74
    Color, ASTM D1500 2.5
    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 9.5
    Water, wt % 33
    Chlorine, wt % Nil
    Fatty Oil, wt % 4
    Sulfur, Total, wt % 2.2
    Sulfur, Active, wt % Nil
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