Coolant Selection Chart


Coolant Type Appearance Color Usable Temp Range (°F) Specific Heat (Btu/lb/°F) @100°F Specific Gravity @100°F Viscosity CS/SSU @100°F K for P=F × ΔT × K& @100°F
Water - Clear 35 to 212 0.997 0.9931 .7/ 6 146
Air 1 - - - 0.240 0.075 2 - 0.316
Ethylene Glycol 40% Water 60% (note 4) - Clear 5 0 to 220 0.855 1.042 1.8/32 131
Ethylene Glycol 50% Water 50% (note 4) - Clear 5 -30 to 225 0.82 1.055 2.2/33.5 127
Ethylene Glycol 60% Water 40% (note 4) - Clear 5 -66 to 235 0.76 1.066 3.0/36 119
Propylene Glycol 40% Water 60% (note 4) - Clear 5 10 to 206 0.92 1.021 2.3/33.5 138
Propylene Glycol 50% Water 50% (note 4) - Clear 5 -25 to 210 0.862 1.027 3.2/36.8 130
Propylene Glycol 60% Water 40% (note 4) - Clear 5 -50 to 217 0.825 1.03 4.5/41 125
PAO Poly-alphaolefin Clear -55 to 265 0.54 0.783 5.4/43 62
Coolanol 20R Silicate Ester Clear -100 to 300 0.465 0.88 2.1/33 60
Coolanol 25R Silicate Ester Clear -60 to 300 0.45 0.882 4.8/41 58
Coolanol 35R Silicate Ester Clear -30 to 400 0.465 0.875 7.5/51 60
DC-200 3 Dimethyl Silicon Fluid Clear -90 to 390 0.41 0.872 2.0/32.6 53
Dowtherm J Aromatic Oil Clear -70 to 358 0.45 0.85 .6/ 6 56
Dowtherm G Aromatic Oil Amber 40 to 575 0.387 1.09 8.19/53 62
Diala AX 7 Univolt 33 Mineral Oil (Transformer) Amber 30 to 310 0.44 0.874 10.2/60 57
Marcol 87 (CS) Mineral Oil (White Oil) Clear 30 to 310 0.44 0.84 16.8/84 54
MIL-H-5606 Mineral Oil (Hydraulic) Red 30 to 475 0.44 0.85 13.3/70 55
Fluorinert FC75/FC77/FC104 Fluoro-Carbon Clear -120 to 210 0.25 1.75 .63/ 6 64

All Data Is Approximate - Not Responsible For Errors Or Omissions.

All properties at 100°F unless otherwise noted.


  • 1. Values given at sea level, 70°F.

  • 2. Density in lb/ft³.

  • 3. DC-200 is a brand name covering a family of coolants of various viscosities. Properties are those of a light grade: 2 centistokes at 25°C (77°F).

  • 4. Special inhibitors may be required. Consult factory.

  • 5. Commercial anti-freeze may be colored.

  • 6. Below range of scale.

  • 7. Values given at 60° F.