25
General Operation
Bath Fluid
Limitations and Disclaimer
8.3.11.1
The information given in this manual regarding fluids is intended only to be used as
a general guide in choosing a fluid. Though every effort has been made to provide
correct information we cannot guarantee accuracy of data or assure suitability of a
fluid for a particular application. Specifications may change and sources sometimes
offer differing information. Hart Scientific cannot be liable for any personal injury or
damage to equipment, product or facilities resulting from the use of these fluids. The
user of the bath is responsible for collecting correct information, exercising proper
judgment, and insuring safe operation. Operating near the limits of certain properties
such as the flash point or viscos ity can compromise safety or performance. Your
company’s safety policies re garding flash points, toxicity, and such issues must be
considered. You are responsible for reading the MSDS (material safety data sheets)
and acting accordingly.
Table 3 Table of Various Bath Fluids
Fluid
(# = Hart
Part No.)
Lower
Temperature
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
W
-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°C
0.001
Mineral Oil
40°C (v)
190°C (fl)
190°C
15 @ 75°C
5 @ 125°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°C
5 @ 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
1000 @ 25°C
50 @ 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, oc)
302°C
50 @ 80°C
7 @ 204°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°C
NONE
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
W
/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.
