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Metal adhesives

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Master Bond MasterSil 970-LO Silicone
Categories: Polymer; Adhesive; Thermoset; Silicone

Material Notes: Key Features:
  • Meets ASTM E595 specifications
  • Convenient handling
  • Superb physical and electrical properties
  • Low shrinkage upon curing
  • White color
  • High flexibility
Product Description: Master Bond MasterSil 970-LO is a two component, moderate viscosity silicone for high performance bonding, sealing, coating and encapsulating. First and foremost is that it fully passes NASA low outgassing test requirements. Since it is an addition cured system, it does not require air for cross-linking and can cure in thick sections well beyond 1 inch. The mix ratio is a user friendly one to one by weight. Upon mixing, the exothermic is very low and the working life is very long (for a 100 gram mass, about 8-12 hours). It is a moderate viscosity type silicone with excellent flow properties. The cure schedule is straightforward, 4-6 hours at 150°F or 2-3 hours at 180-200°F. Upon curing, MasterSil 970-LO has robust physical strength and electrical insulation properties. Its lap shear strength, tensile strength and elongation profile exceed the typical values normally reached with this type of curing system (see table below). It withstands the most rigorous types of thermal cycling and shock. Also, it has stellar electrical insulation properties and is ideal for potting and encapsulation applications. MasterSil 970-LO bonds well to a wide variety of substrates, including metals, composites, glass, ceramics as well as many types of rubber and plastics. MasterSil 970-LO is a first rate adhesive and since it is an addition cured system, it can be used for bonding larger pieces. The system is 100% solids and its color is white. The service temperature ranges from -120°F to +400°F. MasterSil 970-LO is part of a unique group of two part silicones in that it meets low outgassing certifications. It can be used in the most challenging types of situations in the aerospace, electronic, optical and specialty OEM industries particularly when vacuum compatibility and flexibility are required properties.

Product Advantages:

  • Convenient handling: one to one mix ratio by weight.
  • Long working life, moderate viscosity with good flow
  • Low shrinkage upon curing
  • Impressive physical strength profile
  • Solid electrical insulation properties
  • Fully complies with NASA low outgassing specifications

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 PropertiesOriginal ValueComments
Viscosity 8000 - 12000 cPPart B
 11000 - 16000 cPPart A
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore A 25 - 40
Tensile Strength 350 - 750 psi
Elongation at Break 200 - 250 %
Modulus of Elasticity 300 - 500 ksi
Adhesive Bond Strength 300 - 700 psiTensile Lap, Aluminum to Aluminum
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity >= 1.00e+14 ohm-cm
Dielectric Constant 2.8
@Frequency 60 Hz
Dielectric Strength 450 V/mil
@Thickness 3.17 mm
 
Thermal PropertiesOriginal ValueComments
Maximum Service Temperature, Air 400 °F
Minimum Service Temperature, Air -120 °F
 
Processing PropertiesOriginal ValueComments
Cure Time 2.00 - 3.00 hour
@Temperature 82.2 - 93.3 °C
 4.00 - 6.00 hour
@Temperature 65.6 °C
Working Life 360 - 600 minAfter mixing, 100 gram batch
Shelf Life 6.00 Month
@Temperature <=23.9 °C
in original, unopened containers
 
Descriptive Properties
Mixing Ratio1:1 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 go back to viewing the property data in MatWeb's normal format.

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PMASTM944 / 185537

Metal adhesives

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