Insulators – Mica and ThermalsilTM III
Mica and ThermalsilTM III
FIGURE A
FIGURE B
Thermalsil™ III provides excellent thermal conductivity
and electrical resistance. It is used as an electrically-isolat-
ing interface material composed of silicone elastomer
binder with a thermally conductive filler. It is reinforced
with glass cloth to resist tearing and cut-through due to
burrs on transistors or heat sinks.
"A"
"A"
1.83
(0.072)
"D"
DIA
TYP(2)
Thermalsil™ III eliminates the need for grease application
and conforms to mounting surfaces under clamping pres-
sure for optimum heat conduction. The finely woven glass
cloth provides the thinnest possible matrix for enhanced
thermal resistance. Thermalsil™ III is available in any con-
figuration with adhesive backing.
"D"
DIA
10.92
(0.430)
"B"
"B"
"C"
DIA
TYP(2)
"C"
30.15
Mica insulators provide high maximum operating temper-
atures (550°C) and excellent electrical properties.
(1.187)
ORDERING INFORMATION
Part number
56-77-9G
56-03-2G
53-77-9G
53-03-2G
Description
Device
TO-220
TO-3
"A" Dim
"B" Dim
"C" Dim
"D" Dim
Figure
Mica
18.42 (0.725)
42.04 (1.655)
18.42 (0.725)
42.04 (1.655)
13.21 (0.520)
27.00 (1.063)
13.21 (0.520)
27.00 (1.063)
4.32 (0.170)
3.96 (0.156)
4.32 (0.170)
3.96 (0.156)
2.92 (0.115)
1.57 (0.062)
2.92 (0.115)
1.57 (0.062)
B
A
B
A
Mica
ThermalsilTM III
ThermalsilTM III
TO-220
TO-3
TYPICAL PROPERTIES FOR MICA INSULATORS
TYPICAL PROPERTIES FOR THERMALSILTM III
Property
Typical value 25°C
Electrical
Test method
Property
Electrical
172 X 103 volts/mm (4500 volts/mil)
Dielectric constant
2.5@50 Hz
2.5@103 Hz
2.5@106 Hz
ASTM D-150
Dielectric strength
0.025 mm to 0.076 mm thick in air (1 to 3 mils thick in air)
Dielectric constant
Dissipation factor
Volume resistivity
6.5 to 8.7
Dielectric breakdown voltage 26.3 x 103 volts/mm (667 volts/mil)
ASTM D-149
ASTM D-257
ASTM D-150
0.0001-0.0004 @ 106 Hz
1015 ohm-cm
Volume resistivity
5.7 x 1015 ohm-cm
Dielectric dissipation factor
0.008@50 Hz
0.004 @103 Hz
0.004 @106 Hz
Physical
Modules of elasticity in tension
Tensile strength
172 X 103 Mpa (25 X 106) psi
310 Mpa (45,000 psi)
3.0, 115
Physical
Hardness mohs, shore
Compressive strength
Specific gravity
Thickness
0.15mm
2.21 X 108 Pa (32,000 psi)
(0.006 inch)
2.9
Color
Gray-Green
6.1 x 107 Pa (8786 psi)
Thermal
Tensile strength
Hardness, shore A
Elongation
Thermal conductivity
Coefficient of thermal expansion
Specific heat
0.528 W/(m °C ) (0.30 Btu/hr-ft °F)
3.24 X 10-5 °C (1.8 X 10-5 °F)
0.084 KJ/Kg °C (0.02 Btu/Lb °F)
1275°C (2327 °F)
550 °C (1022 ºF)
87
2% or less
Thermal
Melting point
Thermal conductivity
Flame resistance
0.92 W/(m °C ) (0.532 Btu/hr. ft °F)
UL 94V-0
Max. operating temperature
UL card #E-58126 (S)
Service temperature
-60°C to 180°C
(-76°F to 356°F)
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103
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