Dow Dowsil 739 Plastic Adhesive White

Dow Dowsil 739 Plastic Adhesive White Datasheet
  • Description for Dow Dowsil 739 Plastic Adhesive White

    One-part non-flowing general purpose adhesive with good flame resistance

    *See Terms of Use Below

    Brand Dowsil
    Application Type Bond, Sealing
    1 Part or 2 Part 1 Part
    Material Form Paste
    Substrate Glass, Plastic, Ceramics, Many reactive metals
    Industry Parts fixing of power supply module, General purpose, E-Mobility Solutions, Smart Meters, Power Tools, Smart Home Devices, Electronic devices
    Manufacturer Dow
    Chemistry Silicone
    Cure Method Moisture Cure, RTV, Optional heat acceleration
    Cure Temperature (°C) 20 to 25 Room Temp Cure
    Cure Time (min) 4,320, 1,440 to 4,320
    Viscosity (cPs) Non-flowing
    Color White
    High Temperature Resistance (°C) 200
    Low Temperature Resistance (°C) -45, -55
    Extrusion Rate 157 (g/min)
    Key Specifications UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: UL 94 V-1
  • Technical Data for Dow Dowsil 739 Plastic Adhesive White

    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Paste
    • Substrate
    • Industry
      • E-Mobility Solutions
      • Electronics - Parts fixing of power supply module, Electronic devices
      • Smart Meters
      • Smart Home Devices
      • General Purpose
      • Power Tools
      • Other - Wedge bonding of CRT, Uses requiring added flame resistance
    • Chemistry
    • Application Method
      • Dispenser - Needle dispense, Manual or automated
    • Cure Method
      • Moisture / Condensation Cure - Moisture Cure
      • Heat - Optional heat acceleration
      • RTV (Room Temperature Vulcanization) - RTV
    • Color
      • White
    • Key Specifications
      • UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: V-1 - UL 94 V-1
    • Brand
      • Dowsil
    Cure Specs
    Cure Temperature (°C) 20 to 25 Room Temp Cure Test Method
    Cure Time (min) 4,320, 1,440 to 4,320 Test Method
    Viscosity (cPs) Non-flowing
    Fixture or Handling Strength Time (min)
    Tack Free Time (min) 75, Fast, 30 Test Method
    Bond Strength
    Shear Strength (psi) 140 Test Method
    Tensile Strength (psi) 200
    Material Resistance
    Flame Resistance Good flame resistance
    Environmental Resistance Environmental resistance
    High Temperature Resistance (°C) 200 Test Method
    Low Temperature Resistance (°C) -45, -55 Test Method
    Moisture/Humidity Resistance Moisture/humidity resistance
    Dissipation Factor 4.00E-03 Test Method
    Dielectric Strength (V/mil) Good dielectric properties, Durable, 625
    Dielectric Constant 3.50 Test Method
    Volume Resistivity (O) 2.0E+15 (ohms/cm)
    Shore A Hardness 24
    Elongation (%) 500, High
    Flexibility Flexible
    Other Properties
    Extrusion Rate 157 (g/min)
    Specific Gravity 1.400 Test Method
    Business Information
    Shelf Life Details For best results, Dow Corning RTV adhesives should be stored at or below the storage temperature listed on the product label. 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 is indicated by the “Use Before” date found on the product label.
    Shelf Life Temperature (°F) 81
    Shelf Life Type from Date of Manufacturer
    Shelf Life (mon) 15
    Not Good For
    Don't Use With Polypropylene, Polyethylene, Teflon, Non-reactive plastic surfaces, Non-reactive metal substrates, Plastic substrates that are highly plasticized, Rubber substrates that are highly plasticized
  • Best Practices for Dow Dowsil 739 Plastic Adhesive White

    *See Terms of Use Below

    1. Surface Preparation

      All surfaces should be thoroughly cleaned and/or degreased with Dow 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. Curing

      Cure adhesives are generally cured at room temperature and in an environment of 30 to 80 percent relative humidity eliminating the need for curing ovens and the associated costs of energy and capital. Greater than 90 percent of full physical properties should be attained within 24 to 72 hours and varies according to product. Faster manufacturing throughput is achieve however since the adhesive and component can be handled in much shorter times of about 10 to 120 minutes depending on the adhesive selected and the amount of applied. These adhesives are not typically used in highly confined spaces or where a deep section cure is required as they generally cure from the exposed surface inward at a rate of 0.25 inch per seven days. Cure progresses from the outer exposed surface and is dependent on the moisture in the air. Working time is generally a few minutes to an hour for these products until a surface skin begins to form. Mild heat below 60°C (140°F) may be used to increase through-put by accelerating the cure.

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    *See Terms of Use Below

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
20 to 25°C Room Temp Cure 3-mm thickness, 20°C, 55% MRH.
Cure Time Test Methods
Cure Time Test Method
4,320 min 3-mm thickness, 20°C, 55% MRH.
1,440 to 4,320 min
Tack Free Time Test Methods
Tack Free Time Tack Free Temperature
75 min 25°C
30 min RT
Shear Strength Test Methods
Shear Strength Type
140 psi Lap shear strength
High Temperature Resistance Test Methods
High Temperature Resistance Test Method
200°C Long periods of time
Low Temperature Resistance Test Methods
Low Temperature Resistance Test Method
-45°C Long periods of time
Dielectric Constant Test Methods
Dielectric Constant Test Method
3.50 Dielectric constant, 1 MHz
Dissipation Factor Test Methods
Dissipation Factor Test Method
4.00E-03 At 1MHz
Specific Gravity Test Methods
Specific Gravity Test Method
1.400 Cured