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Metal adhesives

Master Bond MasterSil 151 Two Component Low Viscosity Silicone Compound
Categories: Polymer; Thermoset; Silicone

Material Notes: Key Features:
  • High flexibility
  • Optically clear
  • Electrically insulative
  • Serviceable from -65°F to +400°F
  • Cures at room or elevated temperatures
  • Low viscosity
Product Description: Master Bond MasterSil 151 is a two component, low viscosity silicone compound for high performance potting and encapsulation. It is an addition cured system and does not require exposure to air for complete cross-linking. It has a ten to one mix ratio by weight and will not outgas while curing. The system is 100% solids and contains no solvents. MasterSil 151 has a thin consistency with excellent flow making it highly desirable for potting and encapsulation. This silicone combines remarkable flexibility, high temperature resistance, superb electrical insulation along with outstanding optical clarity. It is capable of withstanding the most rigorous thermal cycling and shock. Its water resistance is quite good. These properties enable MasterSil 151 to be used in applications involving sensitive optical and electrical components. Some other specialty uses include encapsulating LEDs, optical fiber cladding and potting connectors. Also noteworthy are its low index of refraction and its ability to transmit light very well from 220-2,500 nanometers. The service temperature range for this system is -65°F to +400°F. MasterSil 151 has prominence in optical, opto-electronic, specialty OEM and related applications where the attributes mentioned above are desirable.

Product Advantages:

  • Addition cured; no by-products released during cure; does not require air for curing
  • Low exotherm; very long pot life
  • Can cure in thicknesses beyond 1 inch
  • Very low shrinkage upon cure
  • Low viscosity ideal for potting and encapsulation
  • Excellent optical clarity and transmission properties
  • Lower index of refraction
  • Superior electrical insulation properties; highly resistant to water

Information provided by Master Bond Inc.

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
Viscosity 50 - 150 cP50 - 150 cPPart B
 2000 - 4000 cP2000 - 4000 cPPart A
 
Mechanical PropertiesMetricEnglishComments
Hardness, Shore A 50 - 6050 - 60
Tensile Strength 0.689 - 8.27 MPa100 - 1200 psi
Elongation at Break 120 - 150 %120 - 150 %
Adhesive Bond Strength >= 0.483 MPa>= 70.0 psiTensile Lap, Aluminum to Aluminum
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity >= 1.00e+14 ohm-cm>= 1.00e+14 ohm-cm
Dielectric Constant 2.5
@Frequency 60 Hz
2.5
@Frequency 60 Hz
Dielectric Strength 17.7 kV/mm
@Thickness 3.17 mm
450 kV/in
@Thickness 0.125 in
 
Thermal PropertiesMetricEnglishComments
Maximum Service Temperature, Air 204 °C400 °F
Minimum Service Temperature, Air -53.9 °C-65.0 °F
 
Optical PropertiesMetricEnglishComments
Refractive Index 1.4051.405
 
Processing PropertiesMetricEnglishComments
Cure Time  60.0 - 120 min
@Temperature 93.3 °C
1.00 - 2.00 hour
@Temperature 200 °F
 1440 - 2880 min
@Temperature 23.9 °C
24.0 - 48.0 hour
@Temperature 75.0 °F
Working Life 120 - 240 min120 - 240 min100 g. batch
Shelf Life 6.00 Month
@Temperature <=23.9 °C
6.00 Month
@Temperature <=75.0 °F
in original, unopened containers
 
Descriptive Properties
Mixing Ratio10:1 by weightPart A to B

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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PMASTM929 / 185522

Metal adhesives

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