• Description for Dow SE 738

    Noncorrosive; general purpose; non-flow.

    *See Terms of Use Below

    Application Type Bond
    1 Part or 2 Part 1 Part
    Material Form Liquid, Silicone elastomer
    Industry Capacitors of coils, Circuit board
    Manufacturer Dow
    Chemistry Silicone elastomer
    Cure Method Moisture, RTV
    Cure Temperature (°C) 20 to 25, 20 to 25
    Cure Time (min) 4,320
    Viscosity (cPs) Non-flow
    Color White
    High Temperature Resistance (°C) 200
    Low Temperature Resistance (°C) -45, -55
    Key Specifications UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94 HB
  • Technical Data for Dow SE 738

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Elastomer - Silicone elastomer
      • Liquid
    • Industry
      • Electronics - Circuit board
      • Coils - Capacitors of coils
    • Chemistry
    • Cure Method
      • Moisture / Condensation Cure - Moisture
      • RTV (Room Temperature Vulcanization) - RTV
    • Color
      • White
    • Key Specifications
      • UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94 HB
    Specifications
    Cure Specs
    Cure Temperature (°C) 20 to 25, 20 to 25 Test Method
    Cure Time (min) 4,320 Test Method
    Viscosity (cPs) Non-flow
    Tack Free Time (min) 82 Test Method
    Bond Strength
    Shear Strength (psi) 80 Test Method
    Tensile Strength (psi) 360
    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 0.00070 Test Method
    Dielectric Strength (V/mil) Good, Durable, 500
    Dielectric Constant 2.80 Test Method
    Volume Resistivity (O) 3E+15 (ohms/cm)
    Hardness
    Shore A Hardness 33
    Elongation (%) 4
    Flexibility Flexible
    Other Properties
    Specific Gravity 1.050
    Business Information
    Shelf Life Details Shelf life is indicated by the “Use Before” date found on the product label. For best results, Dow Corning RTV adhesives should be stored at or below 25°C (77°F). Special precautions must be taken to prevent moisture from contacting these materials. Containers should be kept tightly closed with head or air space minimized. Partially filled containers should be purged with dry air or other gases, such as nitrogen.
    Shelf Life Type from date of manufacture
    Shelf Life (mon) 24
    Not Good For
    Don't Use With Plastic, rubber
  • Best Practices for Dow SE 738

    *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.

  • Comparable Materials for Dow SE 738

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
20 to 25°C 30 to 80 percent relative humidity
20 to 25°C Cure time, 3-mm thickness, 20°C, 55% MRH.
Cure Time Test Methods
Cure Time Test Method
4,320 min Cure time, 3-mm thickness, 20°C, 55% MRH.
Tack Free Time Test Methods
Tack Free Time Tack Free Temperature
82 min 20 to 25°C
Shear Strength Test Methods
Shear Strength Type
80 psi Lap shear strength
Dielectric Constant Test Methods
Dielectric Constant Test Method
2.80 Dielectric constant, 1 MHz
Dissipation Factor Test Methods
Dissipation Factor Test Method
0.00070 Dissipation factor, 1 MHz