Hydrokool™ SS

Premium Semi-Synthetic Coolant for Metalworking

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.

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

Licenses & Approvals
Additional Details
Specific Gravity @ 60°F1.05
Density, lbs/gal @ 60°F8.74
Color, ASTM D15002.5
Boiling Point, °C (°F)100 (212)
Flash Point (COC), °C (°F)N/A(2)
Freezing Point, °C (°F)0 (32)
pH, 5% (1:20) dilution9.5
Water, wt %33
Chlorine, wt %Nil
Fatty Oil, wt %4
Sulfur, Total, wt %2.2
Sulfur, Active, wt %Nil