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Table 2 Table of various fluids and their properties
Fluid
Lower
(# = Hart Part No.)
Temperature
Limit*
Halocarbon 0.8
–90°C (v)**
#5019
Methanol
–96°C (fr)
Water
0°C (fr)
Ethylene
–35°C (fr)
Glycol—50%
#5020
Mineral Oil
40°C (v)
Dow Corning
–40°C (v)**
200.5
Silicone Oil
Dow Corning
–35°C (v)**
200.10
#5012
Dow Corning
7°C (v)
200.20
#5013
Dow Corning
25°C (v)
200.50
Silicone Oil
Dow Corning 550
70°C (v)
#5016
Dow Corning 710
80°C (v)
#5017
Dow Corning
66°C (v)
210-H
Silicone Oil
Heat Transfer Salt
145°C (fr)
#5001
*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.
Upper
Temperature
Flash
Viscosity
Limit*
Point
(centistokes)
70°C (e)
NONE
5.7 @ –50°C
0.8 @ 40°C
0.5 @ 70°C
60°C (b)
54°C
1.3 @ –35°C
0.66 @ 0°C
0.45 @ 20°C
95°C (b)
NONE
1 @ 25°C
0.4 @ 75°C
90°C (b)
NONE
7 @ 0°C
2 @ 50°C
0.7 @ 100°C
190°C (fl)
190°C
15 @ 75°C
5 @ 125°C
133°C (fl, cc)
133°C
5 @ 25°C
165°C (fl, cc)
165°C
10 @ 25°C
3 @ 135°C
230°C (fl, cc)
230°C
20 @ 25°C
280°C (fl, cc)
280°C
20 @ 25°C
232°C (fl, cc)
232°C
50 @ 70°C
300°C (fl, oc)
10 @ 104°C
302°C (fl, oc)
302°C
50 @ 80°C
7 @ 204°C
315°C (fl, oc)
315°C
50 @ 66°C
14 @ 204°C
530°C
NONE
34 @ 150°C
6.5 @ 300°C
2.4 @ 500°C
Freezing Point: The freezing point of a fluid is an obvious limitation to stir-
ring. As the freezing point is approached high viscosity may also limit
performance.
Pour Point: This represents a handling limit for the fluid.
Viscosity: Points shown are at 50 and 10 centistokes viscosity. When viscosity
is greater than 50 centistokes stirring is very poor and the fluid is unsatisfactory
for bath applications. Optimum stirring generally occurs at 10 centistokes and
below.
Fume Point: A fume hood should be used. This point is very subjective in na-
ture and is impacted by individual tolerance to different fumes and smells, how
well the bath is covered, the surface area of the fluid in the bath, the size and
Specific Heat
Specific
(cal/g/°C)
Gravity
1.71 @ 40°C
0.2
0.810 @ 0°C
0.6
0.792 @ 20°C
1.00
1.00
1.05
0.8 @ 0°C
0.87 @ 25°C
0.48 @ 25°C
0.84 @ 75°C
0.53 @ 75°C
0.81 @ 125°C
0.57 @ 125°C
0.92 @ 25°C
0.4
0.934 @ 25°C
0.43 @ 40°C
0.45 @ 100°C
0.482 @ 200°C
0.949 @ 25°C
0.370 @ 40°C
0.393 @ 100°C
0.420 @ 200°C
0.96 @ 25°C
0.4
1.07 @ 25°C
0.358 @ 40°C
0.386 @ 100°C
0.433 @ 200°C
1.11 @ 25°C
0.363 @ 40°C
0.454 @ 100°C
0.505 @ 200°C
0.96 @ 25°C
0.34 @ 100°C
2.0 @ 150°C
0.33
1.9 @ 300°C
1.7 @ 500°C
8 General Operation
Heat Transfer Fluid
Thermal
Thermal
Conductivity
Expansion
(cal/s/cm/°C)
(cm/cm/°C)
0.0004
0.0011
0.0005 @ 20°C
0.0014 @ 25°C
0.0014
0.0002 @ 25°C
0.001
0.00025 @ 25°C
0.0007 @ 50°C
0.00028 @ 25°C
0.00105
0.00032 @ 25°C
0.00108
0.00034 @ 25°C
0.00107
0.00037 @ 25°C
0.00104
0.00035 @ 25°C
0.00075
0.00035 @ 25°C
0.00077
0.0003
0.00095
0.0014
0.00041
Resistivity
12
Ω-cm )
(10
5 @ 25°C
1000 @ 25°C
10 @ 150°C
1000 @ 25°C
50 @ 150°C
1000 @ 25°C
50 @ 150°C
1000 @ 25°C
50 @ 150°C
100 @ 25°C
1 @ 150°C
100 @ 25°C
1 @ 150°C
100 @ 25°C
1 @ 150°C
1.7 Ω /cm
3
29
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