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Metal adhesives

Master Bond MasterSil 153AO Two part thermally conductive, electrically insulating silicone
Categories: Polymer; Thermoset; Silicone

Material Notes: Key Features:
  • Paste consistency
  • Long open time
  • High temperature resistant
  • Remarkable adhesive properties
Product Description: Master Bond MasterSil 153AO is a two component silicone for high performance bonding and sealing. With a forgiving 1 to 1 mix ratio by weight, it has a paste consistency and minimal flow while curing. It generates very little heat after mixing and has an exceptionally long working life. MasterSil 153AO cures at ambient temperature or more rapidly at elevated temperatures. The optimum cure is overnight at room temperature followed by 2-4 hours at 135°F to 185°F. Also, it contains no solvents or diluents and has very low shrinkage upon curing. This silicone adhesive bonds well to a wide variety of substrates such as metals, glass, ceramics and many plastics. Moreover, it bonds tenaciously to silicone rubber. Other outstanding features include high temperature resistance, silicone type flexibility, and exceptionally strong bonding properties. As an addition cured system, it does not require exposure to air for complete cross-linking. This system is top notch for withstanding thermal cycling and shock. Minimal stress is generated when bonding dissimilar substrates. It is white in color, with a service temperature range spanning between -65°F to +400°F. MasterSil 153AO is a great choice for applications involving sensitive optical and electronic components where heat dissipation along with electrical insulation is critical.

Product Advantages:

  • Addition cured, no by-products released during cure, does not require air for curing
  • Convenient handling, 1:1 mix ratio by weight
  • Paste consistency
  • Several curing schedule options are available
  • Very low shrinkage upon curing
  • Especially robust adhesive properties

Information provided by Master Bond.

Vendors: Master Bond is a leading manufacturer of adhesives, sealants, coatings and potting compounds. Master Bond’s vast product line consists of over 3,000 epoxy, polyurethane, silicone, cyanoacrylate and latex adhesives that vary in viscosity, cure speed, strength, chemical resistance, electrical properties, etc. Our custom adhesives offer design flexibility and provide excellent bonding performance. Visit www.masterbond.com.

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Physical PropertiesMetricEnglishComments
Specific Gravity 1.63 g/cc1.63 g/ccPart B
 1.68 g/cc1.68 g/ccPart A
Viscosity 100000 - 500000 cP100000 - 500000 cPPart B, thixotropic
 200000 - 550000 cP200000 - 550000 cPPart A, thixotropic
 
Mechanical PropertiesMetricEnglishComments
Hardness, Shore A 65 - 7565 - 75
Tensile Strength 2.41 - 2.76 MPa350 - 400 psi
Elongation at Break 100 - 120 %100 - 120 %
Adhesive Bond Strength 4.83 - 5.52 MPa700 - 800 psiTensile lap shear, Al to Al
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity >= 1.00e+14 ohm-cm>= 1.00e+14 ohm-cm
Dielectric Constant 3.7
@Frequency 100 Hz
3.7
@Frequency 100 Hz
Dielectric Strength 17.7 kV/mm
@Thickness 3.17 mm
450 kV/in
@Thickness 0.125 in
 
Thermal PropertiesMetricEnglishComments
CTE, linear 150 - 180 µm/m-°C83.3 - 100 µin/in-°F
Thermal Conductivity 0.937 - 1.08 W/m-K6.50 - 7.50 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air 204 °C400 °F
Minimum Service Temperature, Air -53.9 °C-65.0 °F
 
Processing PropertiesMetricEnglishComments
Cure Time  120 - 240 min
@Temperature 57.2 - 85.0 °C
2.00 - 4.00 hour
@Temperature 135 - 185 °F
Optimum: Overnight at 75°F followed by 2-4 hours at 135°F-185°F
 120 - 240 min
@Temperature 57.2 - 85.0 °C
2.00 - 4.00 hour
@Temperature 135 - 185 °F
Option 2
 4320 - 5760 min
@Temperature 23.9 °C
72.0 - 96.0 hour
@Temperature 75.0 °F
Option 1
Working Life 240 - 360 min240 - 360 minafter mixing, 100 gram batch
Shelf Life 3.00 - 6.00 Month3.00 - 6.00 Monthin original, unopened containers
 
Descriptive Properties
Mixing ratio1:1 by weightParts A to B

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PMASTM5934 / 306823

Metal adhesives

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