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7012 Calibration Bath
User's Guide
Table 2 Table of various bath fluids and their properties
Fluid
Lower
(# = Hart Part
Temperature
No.)
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
145°C (fr)
Salt
#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.
32
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
110°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 good
stirring.
Pour Point: This represents a handling limit for the fluid.
Viscosity: Points shown are at 50 and 10 centistokes. Greater than 50 centi-
stokes stirring is very poor and unsatisfactory for bath applications. At 10
centistokes and below optimum stirring can occur. These are rules of thumb
which have been useful for most applications.
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
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
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