Synkool 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.

Synkool SS mixes with soft or hard water to form a high-quality semi-synthetic metalworking fluid that provides excellent cooling properties and lubricity for maximum tool life and good surface finishes on the machined parts. It contains a biocide to combat the growth of harmful microorganisms in machine sumps and reservoirs.

Synkool SS is formulated to provide an optimum balance of lubricity and detergency for high-quality finishes on machined parts and for overall machine cleanliness. It is ideal for use in machine sumps, as well as in once-through applications because it is highly resistant to microbial and bacterial degradation that causes rancid odors. It forms a clear, golden-colored solution that permits easy observation of the machining operation. An oiliness agent helps to minimize tool wear and prevent particle agglomeration. Special inhibitors help protect metal surfaces against rust and corrosion.

Synkool SS does not contain chlorine, active sulfur, nitrites, phenols or diethanolamine (DEA).
Unit of Measure


Density @ 15.6 ºC (60 ºF)

N/A 1.05 g/cm³8.77 lbs/gal
Color1 N/A Golden

Boiling Point

N/A 100 ºC212 ºF

Freezing Point

N/A 0 ºC32 ºF

pH 5% (1:20) Dilution

N/A 9.5

Water, Wt

N/A 33 %

Fatty Oil, Wt.

N/A 4.0 %

Sulfur Total, Wt.

N/A 2.2 %

Recommended Concentrations Synkool SS in Water (Volume %)


Carbon Steels,
Malleable Iron,
Operation Cast Iron High Alloy Steels Tool Steels
Drilling, Milling, Turning 4-5 4-5 4-5
Light-Duty Broaching, Form Milling, Reaming, Sawing, Tapping 4-6 5-6 5-6
Grinding 3-4 3-4 3-4

Refractometer Reading


Dilution Ratio 1:10 1:15 1:20 1:25 1:30
Reading 10.3 7.2 5.4 4.6 3


N/A Synkool 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)
  • Drilling
  • Grinding
  • Milling
  • Reaming
  • Sawing
  • Tapping
  • Turning



  • Excellent cooling and lubricating properties
  • Helps extend cutting tool life
  • Reduces grinding wheel wear
  • Good surface finish
  • Excellent rust protection
  • Noncorrosive to non-ferrous metals
  • Resists bacterial degradation
  • Transparent for good visibility of the machining operation
  • Mixes easily with water
    Note: When mixing, always add Synkool SS to water; never add water to Synkool SS. Typical concentrations (Synkool SS in water) range from 3% to 8% depending on the machining operation, type of metal, and water hardness. Coolant concentration may be monitored with a refractometer.

Health and Safety Information

N/A For recommendations on safe handling and use of this product, please refer to the Material Safety Data Sheet via

Ordering Information

Package Type

N/A 55G RD

Pricing Information

N/A Price/Gal

Shipping Note

N/A Shipping will be quoted upon receipt of your order.

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