110-064
6
Suitable Fluids
WARNING:
DO NOT circulate water through your Flow Through Cooler.
DO NOT use combustible or toxic fluids, such as pure methanol.
DO NOT use fluids corrosive to copper.
There are two important factors to consider when choosing a cooling fluid to use with your Flow Through Cooler:
Fluid viscosity and freeze point.
The two most frequently used fluids are (1) a mixture of methanol and distilled water and (2) a mixture of ethylene
glycol or propylene glycol and distilled water. For most applications, a 50:50 mixture of methanol and distilled
water is preferred. This mixture is low in viscosity, has a low freezing point, and is not flammable.
The following table lists various fluids and their performance characteristics. We recommend then when using any
fluid, you stay within the fluid’s normal temperature range for best stability and low vaporization.
Fluid Description
Viscosity
(cSt) @ 25°C
Normal
Temperature Range
Extreme
Temperature Range
Methanol (50%) / water (50%)
1
-40° to 10°C
-50° to 20°C
polycool EG -25
(1)
(50%) / water (50%)
20
-25° to 100°C
-35° to 115°C
polycool PG -20
(2)
(50%) / water (50%)
20
-20° to 100°C
-30° to 115°C
DC200 (5 cSt) silicone oil
5
-35° to 60°C*
-50° to 125°C*
DC200 (10 cSt) silicone oil
10
-20° to 80°C
-35° to 165°C*
polycool HC -50
3
-53° to 60°C*
-62° to 60°C*
1. Ethylene glycol
2. Propylene glycol
* This is the fluid’s flash point temperature
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