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SECTION
- 6
Components
& Accessories
Insulators
Material Temperature in °C Chemical Composition in Percent Useful Maximum Al2O3 SiO2 MgO Na2O Fe2Oe CaO K2O TiO2Alumina 1870 1980 99.00 00.70 00.09 00.07 00.09 00.05 - -Mullite 1650 1760 55.40 42.00 00.04 00.46 00.80 00.10 00.70 00.50Steatite 1010 1340 04.60 64.90 27.80 00.90 00.85 00.28 00.47 00.20Cordierite 1120 1355 24.70 59.80 11.70 00.27 00.59 01.60 00.14 01.20Alumina: Recommended for Nobel Metal Thermocouples since there are few impurities to react with Noble Metal Thermocouples at high Temperature. High physical strength. Good electrical properties. Fair resistance to thermal and electrical shock.
Mullite: Excellent high temperature material. Good Thermal Shock Resistance. Low Thermal Expansion.
Steatite: High physical strength. Good Electrical Properties. Loses resistance at high temperatures. Poor heat shock resistance.
Cordierite : Excellent heat shock resistance. Fair Physical strength and fair electrical properties.
Mullite, Steatite and Cordierite are recommended only for base metal thermocouples.
Two Hole
For Maximum Wire Size Gauge Dimensions in Inches Length in inches Hole Dia Thickness Width Min Max 6 0.181 0.201 5/16 9/16 1 7 0.158 0.178 9/32 31/64 1 7 0.153 0.173 9/32 31/64 3 11 0.100 0.110 3/16 5/16 1 14 0.070 0.090 3/16 5/16 1Beed (Fish Spine Type - Ball and Socket Style) Steatite
For Maximum Wire Size Gauge Dimensions in inches Approx. Quan. Per lb ID OD Length Min. Max 18 0.046 0.066 7/64 7/64 - 18 0.046 0.066 1/8 1/8 16,600 16 0.058 0.078 11/64 11/64 4825 13 0.082 0.102 13/64 13/64 2875 11 0.106 0.126 17/64 17/64 1300 8 0.142 0.162 17/64 17/64 1575
Special Steatite Insulators for 8 Gauge Wire
For Maximum Wire Size Dimensions in inchesLength in inches. Hole Diameter Outside Dia Min. Max 6 0.199 0.219 23/64 1 8 0.182 0.192 1/4 3 8 0.148 0.168 11/32 1 14 0.083 0.103 9/64 1 22 0.029 0.049 1/16 3
8 0.144 0.164 31/64 1 14 0.065 0.085 1/4 1 14 0.065 0.085 1/4 6 14 0.070 0.090 1/4 2 14 0.070 0.090 1/4 3 15 0.062 0.086 1/4 2-1/2 16 0.056 0.076 15/64 3/43 18 0.075 0.081 7/32 3 19 0.038 0.058 5/32 2-1/4 20 0.035 0.045 1/4 3 20 0.037 0.043 1/8 6 20 0.037 0.043 1/8 11-1/2 20 0.037 0.043 1/8 17-1/2 20 0.037 0.043 1/8 23-1/2 20 0.037 0.043 1/8 35-1/2 22 0.037 0.043 1/8 6 22 0.037 0.043 1/8 11-1/2 22 0.037 0.043 1/8 17-1/2 22 0.037 0.043 1/8 23-1/2 22 0.035 0.045 1/8 35-1/2
18 0.135 0.150 1/2 1 14 0.068 0.088 5/16 1 20 0.036 0.056 3/16 1 24 0.044 0.050 3/16 11-1/2 24 0.044 0.050 3/16 17-1/2 24 0.044 0.050 3/16 23-1/2 24 0.044 0.050 3/16 29-1/2 24 0.044 0.050 3/16 35-1/2