MONROE HD is a heavy duty water extendable sulfur-chlorinated metalworking coolant formulated to offer outstanding performance in difficult machining and grinding operations involving hard-to-work metals such as stainless steel, tool steels and high nickel alloys. MONROE HD may be used on all metals except magnesium, copper and some bronze alloys, which may be stained.

Product Data Sheet


MONROE HD is suited for all types of machining processes including turning, milling, tapping, reaming, broaching, hobbing, and sawing. This product also works well in the various grinding processes, including centerless, cylindrical, surface, internal, belt, and disc.

Features & Benefits

  • Used to Replace Straight Oils in Most Operations
  • Excellent Finish in Machining and Grinding Operations
  • Increases Tool Life
  • Better Cooling than Oils
  • Excellent Corrosion Inhibition
  • More Economical than Straight Oil

Recommended Concentrations


Concentration 4% 5% 6% 7% 8% 9% 10%
Ratio (1:33) (1:25) (1:20) (1:17) (1:14) (1:12) (1:11) (1:10)
Refractometer 3.4 4.5 5.6 6.7 7.8 9.0 10.1 11.2

Typical Properties

Appearance-ConcentrateDark brown viscous liquid
Appearance- DilutionTan milky liquid
Residual FilmSoft, fluid
pH @ 20:19.5 ± 0.3
Specific Gravity @ 60°F0.96 ± 0.01
Lbs/Gallon8.1 ± 0.1
Total Sulfur, wt %2
Flash point, PMCCNone