Hydrokool™ HD

Premium Synthetic Coolant for Metalworking

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.

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