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Master Bond adhesives

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Master Bond MasterSil 920-LO Silicone
Categories: Polymer; Adhesive; Thermoset; Silicone; Silicone, RTV, Adhesive/Sealant Grade

Material Notes: Key Features:
  • Meets NASA ASTM E595
  • Moderate viscosity with good flow properties
  • Excellent Neutral type cure
  • Superb optical clarity
Product Description: MasterSil 920-LO is a high performance, RTV silicone for sealing, coating and small encapsulations. First and foremost, it meets NASA low outgassing specifications. It is a neutral curing, non-corrosive type system. Also it has very good flow properties and outstanding electrical insulation values. These properties facilitate its use as a conformal coating and encapsulation system. With a softer durometer than many other silicones, it is particularly well suited for protecting sensitive electronic components. In fact, since it is low outgassing and optically clear, it can be used for select optical applications where delicate components must be protected. Similar to other one part silicones, the curing mechanism is based on humidity; the higher it is, the faster the cure. Also thinner sections cure more quickly than thicker ones. Another noteworthy property is its wide service temperature range of -175°F to +500°F. MasterSil 920-LO bonds very well to a wide variety of substrates including metals, glass as well as many plastics and rubber materials. With its inherent robust flexibility, the system can withstand the most rigorous kinds of thermal cycling and shock. MasterSil 920-LO is a “go-to material” in the encapsulation of sensitive electronic and optical components, especially when low outgassing and low stress are critical requirements. It should be noted, in order to achieve the low outgassing properties, a seven day cure at room temperature is recommended.

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
Specific Gravity 1.01 g/cc
Viscosity 5000 - 10000 cP
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore A 25 - 35
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity >= 1.00e+15 ohm-cm
Dielectric Constant 2.5
@Frequency 60 Hz
Dielectric Strength 500 V/mil
@Thickness 3.17 mm
Dissipation Factor 0.0010
@Frequency 60 Hz
 
Thermal PropertiesOriginal ValueComments
Maximum Service Temperature, Air 500 °F
Minimum Service Temperature, Air -175 °F
 
Optical PropertiesOriginal ValueComments
Refractive Index 1.43
 
Processing PropertiesOriginal ValueComments
Cure Time 168 hour
Tack-Free Time 45.0 - 60.0 min
Working Life 10.0 - 15.0 min
Shelf Life 6.00 Month
@Temperature <=23.9 °C
in original, unopened containers
 
Descriptive Properties
ColorClear

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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Master Bond MasterSil 921-LO Silicone

PMASTM940 / 185533

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