Micro-Bath
General Operation
17
high electrical resistivity. Silicone oils are safe and non-toxic but are expensive.
Fluid Characteristics Charts
Table 3 and Figure 5 help to select a heat exchange fluid media for your constant temperature bath.
These charts are a visual and numerical representation of most of the physical qualities that are
important to remember when you select a fluid. The list is not all inclusive. There are other useful fluids
not shown in this list.
The charts include information on a variety of fluids which are often used as heat transfer fluid in baths.
Because of the temperature range, some fluids may not be useful with your bath.
Table 3. Table of Various Bath Fluids
Fluid
(# = Fluke
Calibration
Part No.)
Lower
Tempera-
ture Limit
*
Upper
Temperature
Limit *
Flash
Point
Viscosity
(centistokes)
Specific
Gravity
Specific Heat
(cal/g/°C)
Thermal
Conductivity
(cal/s/cm/°C)
Thermal
Expansion
(cm/cm/°C)
Resistivity
(10
12
Ω-cm)
Halocarbon
0.8 #5019
-90 °C (v)
**
70 °C (e) NONE
5.7 @ -50 °C
0.8 @ 40 °C
0.5 @ 70 C
1.71 @ 40 °C 0.2 0.0004 0.0011 -
Methanol -96 °C (fr) 60 °C (b) 54 °C
1.3 @ -35 °C
0.66 @ 0 °C
0.45 @ 20 °C
0.810 @ 0 °C
0.792 @ 20 °C
0.6 0.0005 @ 20 °C
0.0014 @
25 °C
-
Water 0 °C (fr) 95 °C (b) NONE
1 @ 25 °C
0.4 @ 75 °C
1.00 1.00 0.0014
0.0002 @
25 °C
-
Ethylene
Glycol-50 %
#5020
-35 °C (fr) 110 °C (b) NONE
7 @ 0 °C
2 @ 50 °C
0.7 @ 100 °C
1.05 0.8 @ 0 °C0.001 - -
Mineral Oil 40 °
C (v) 190 °C (fl) 190 °C
15 @ 75 °C
5 @ 25 °C
0.87 @ 25 °C
0.84 @ 75 °C
0.81 @ 125 °C
0.48 @ 25 °C
0.53 @ 75 °C
0.57 @ 125 °C
0.00025 @ 25 °C
0.0007 @ 50
°C
5 @ 25 °C
Dow Corning
200.05
Silicone Oil
-40 °C (v)
**
133 °C (fl, cc) 133 °C5 @ 25 °C 0.92 @ 25 °C 0.4 0.00028 @ 25 °C 0.00105
1000 @ 25 °C
10 @ 150 °C
Dow Corning
200.10
#5012
-35 °C (v)
**
165 °C (fl, cc) 165 °C
10 @ 25 °C
3 @ 135 °C
0.934 @ 25 °C
0.43 @ 40 °C
0.45 @ 100 °C
0.482 @ 200 °C
0.00032 @ 25 °C 0.00108
1000 @ 25 °C
50 @ 150 °C
Dow Corning
200.20
#5013
7 °C (v) 230 °C (fl, cc) 230 °C 20 @ 25 °C 0.949 @ 25 °C
0.370 @ 40 °C
0.393 @ 100 °C
0.420 @ 200 °C
0.00034 @ 25 °C 0.00107
1000 @ 25 °C
50 @ 150 °C
Dow Corning
200.50
Silicone Oil
25 °C (v) 280 °C (fl, cc) 280 °C 50 @ 25 °C 0.96 @ 25 °C 0.4 0.00037 @ 25 °C 0.00104
100 @ 25 °C
1 @ 150 °C
Dow Corning
550 #5016
70 °C (v)
232 °C (fl, cc)
300 °C (fl, oc)
232 °C
50 @ 70 °C
10 @ 104 C
1.07 @ 25 °C
0.358 @ 40 °C
0.386 @ 100 °C
0.433 @ 200 °C
0.00035 @ 25 °C 0.00075
100 @ 25 °C
1 @ 150 °C
Dow Corning
710 #5017
80 °C (v) 302 °C (fl, cc) 302 °C
50 @ 80 °C
10 @ 104 °C
1.11 @ 25 °C
0.363 @ 40 °C
0.454 @ 100 °C
0.505 @ 200 °C
0.00035 @ 25 °C 0.00077
100 @ 25 °C
1 @ 150 °C
Dow Corning
210-H
Silicone Oil
66 °C (v) 315 °C (fl, oc) 315 °C
50 @ 66 °C
14 @ 204 °C
0.96 @ 25 °C 0.34 @ 100 °C 0.0003 0.00095
100 @ 25 °C
1 @ 150 °C
Heat
Transfer Salt
#5001
145 °C (fr) 530 °CNONE
34 @ 150 °C
6.5 @ 300 °C
2.4 @ 500 °C
2.0 @ 150 °C
1.9 @ 300 °C
1.7 @ 500 °C
0.33 0.0014 0.00041
1.7 Ω/cm
3
*Limiting Factors – b-boiling point, e-high evaporation, fl- flash point, fr- freeze point, v-viscosity – Flash point test, oc=open cup, cc=closed cup
**Very-low water solubility, ice will form as a slush from condensation below freezing.
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