Dow 744 RTV Sealant

Dow 744 RTV Sealant Datasheet
  • Description for Dow 744 RTV Sealant

    Noncorrosive; good adhesion; general purpose; good adhesion; non-flow.

    *See Terms of Use Below

    Application Type Bond, Seal
    1 Part or 2 Part 1 Part
    Material Form Liquid, Silicone elastomer
    Industry Capacitors, Light Emitting Diodes (LEDs), E-Mobility Solutions, Smart Meters, Smart Home Devices, Circuit board
    Manufacturer Dow
    Chemistry Silicone elastomer
    Cure Method Moisture, RTV
    Cure Temperature (°C) 20 to 25, 25
    Cure Time (min) 2,880
    Viscosity (cPs) Non-flow
    Color White
    High Temperature Resistance (°C) 200
    Low Temperature Resistance (°C) -45, -55
  • Technical Data for Dow 744 RTV Sealant

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Elastomer - Silicone elastomer
      • Liquid
    • Industry
      • LED (Light-Emitting Diodes) - Light Emitting Diodes (LEDs)
      • Control Module
      • E-Mobility Solutions
      • Electronics - Capacitors, Circuit board
      • Smart Meters
      • Smart Home Devices
      • Industrial - Batteries
    • Chemistry
    • Cure Method
      • Moisture / Condensation Cure - Moisture
      • RTV (Room Temperature Vulcanization) - RTV
    • Color
      • White
    Specifications
    Cure Specs
    Cure Temperature (°C) 20 to 25, 25
    Cure Time (min) 2,880
    Viscosity (cPs) Non-flow
    Tack Free Time (min) Fast, 55 Test Method
    Bond Strength
    Shear Strength (psi) 430 Test Method
    Tensile Strength (psi) 395
    Material Resistance
    Environmental Resistance Environmental resistance
    High Temperature Resistance (°C) 200
    Low Temperature Resistance (°C) -45, -55
    Moisture/Humidity Resistance Moisture/humidity resistance
    Conductivity
    Dissipation Factor 0.00060, 0.00320, 0.00320 Test Method
    Dielectric Strength (V/mil) Good, Durable, 400
    Dielectric Constant 4.41, 4.31, 4.25 Test Method
    Volume Resistivity (O) 1.1E+15 (ohms/cm)
    Hardness
    Shore A Hardness 37
    Elongation (%) 590, High
    Flexibility Flexible
    Other Properties
    Specific Gravity 1.420
    Business Information
    Shelf Life Temperature (°F) 77
    Shelf Life Type from date of manufacture
    Shelf Life (mon) 12
    Not Good For
    Don't Use With Plastic, rubber
  • Best Practices for Dow 744 RTV Sealant

    *See Terms of Use Below

    1. Surface Preparation

      All surfaces should be thoroughly cleaned and/or degreased with Dow Corning® brand OS Fluids, naphtha, mineral spirits, methyl ethyl ketone (MEK) or other suitable solvent. Solvents such as acetone or isopropyl alcohol (IPA) do not tend to remove oils well, and any oils remaining on the surface may interfere with adhesion. Light surface abrasion is recommended whenever possible, because it promotes good cleaning and increases the surface area for bonding. A final surface wipe with acetone or IPA is also useful. Some cleaning techniques may provide better results than others

      users should determine the best techniques for their particular applications.

    2. Mixing

      Upon standing, some filler may settle to the bottom of the liquid containers after several weeks. To ensure a uniform product mix, the material in each container should be thoroughly mixed prior to use. Two-part materials should be mixed in the proper ratio (1:1 or 10:1) either by weight or volume. The presence of light colored streaks or marbling indicates inadequate mixing.

    3. Deairing/Degassing

      Automated airless dispense equipment can be used to reduce or avoid the need to de-air. If de-airing is required to reduce voids in the cured elastomer, consider a vacuum de-air schedule of >28 inches Hg for 10 minutes or until bubbling subsides.

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Tack Free Time Test Methods
Tack Free Time Tack Free Temperature
Fast
55 min 25°C
Shear Strength Test Methods
Shear Strength Type
430 psi Lap Shear Strength
Dielectric Constant Test Methods
Dielectric Constant Test Method
4.41 At 100 Hz
4.31 At 100 kHz
4.25 At 1MHz
Dissipation Factor Test Methods
Dissipation Factor Test Method
0.00060 At 100 Hz
0.00320 At 100 kHz
0.00320 At 1MHz