Dow Dowsil Q5-8401 Adhesive

Dow Dowsil Q5-8401 Adhesive Datasheet
  • Description for Dow Dowsil Q5-8401 Adhesive

    • Flowable • 1:1 mix ratio • Heat cure • High tensile strength • 2-part • Dark gray • Heat cure •<br/>

    *See Terms of Use Below

    Brand Dowsil
    Application Type Bond, Sealant, Gasketing
    1 Part or 2 Part 2 Part
    Material Form Liquid, Silicone elastomer
    Substrate ABS, Aluminum
    Industry Connector sealing, Lighting, Engine controllers, E-Mobility Solutions, Smart Meters, Smart Home Devices
    Manufacturer Dow
    Chemistry Silicone elastomer, Polydimethylsiloxane
    Cure Method Heat, 2-Part Cure
    Cure Temperature (°C) 120
    Cure Time (min) 90
    Viscosity (cPs) 77,425
    Color Dark Gray
    High Temperature Resistance (°C) 200
    Low Temperature Resistance (°C) -45, -55
  • Technical Data for Dow Dowsil Q5-8401 Adhesive

    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 2 Part
    • Material Form
      • Elastomer - Silicone elastomer
      • Liquid
    • Substrate
    • Industry
      • Lighting
      • Other Transportation - Transmission controllers
      • E-Mobility Solutions
      • Connectors - Connector sealing
      • Smart Meters
      • Smart Home Devices
      • Industrial - Sealing housings, Sealing lids
      • Engine - Engine controllers
      • Construction - Attaching baseplates
    • Chemistry
      • Other - Polydimethylsiloxane
      • Silicone - Silicone elastomer
    • Cure Method
      • Heat
      • 2-Part Cure
    • Color
      • Gray - Dark Gray
    • Brand
      • Dowsil
    • Also Known As
      • Old Name - Q5-8401 Adhesive Kit
    Cure Specs
    Cure Temperature (°C) 120 Test Method
    Cure Time (min) 90 Test Method
    Viscosity (cPs) 77,425 Test Method
    Work / Pot Time (min) Long, 1,440 Test Method
    Mix Ratio 1:1 (by volume), 1:1 (by weight)
    Bond Strength
    General Bond Strength (psi) High
    Shear Strength (psi) 830 Test Method
    Tear Strength (piw) 20 (ppi) Test Method
    Tensile Strength (psi) 875, High
    Material Resistance
    Environmental Resistance Environmental resistance
    High Temperature Resistance (°C) 200
    Low Temperature Resistance (°C) -45, -55
    Moisture/Humidity Resistance Moisture/humidity resistance
    Dielectric Strength (V/mil) Good, Durable, 350
    Volume Resistivity (O) 8.8E+14 (ohms/cm)
    Shore A Hardness 61
    Elongation (%) 210
    Flexibility Flexible
    Modulus (psi) 420 Test Method
    Other Properties
    Specific Gravity 1.310 Test Method
    Business Information
    Shelf Life Details Shelf life is indicated by the “Use Before” date found on the product label.
    Shelf Life Temperature (°F) 122
    Shelf Life (mon) 12
    Not Good For
    Don't Use With Plastic, rubber
  • Best Practices for Dow Dowsil Q5-8401 Adhesive

    *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

      Dow Corning silicone 1:1 adhesives are supplied in two parts that do not require lot matching. The 1:1 mix ratio, by weight or volume, simplifies the proportioning process. To ensure uniform distribution of filler, Parts A and B must each be thoroughly mixed prior to their combination in a 1:1 ratio. When thoroughly blended, the Part A and B liquid mixture should have a uniform appearance. The presence of light colored streaks or marbling indicates inadequate mixing and will result in incomplete cure.

    3. Deairing/Degassing

      For fast-curing adhesives automated mix and dispense equipment should be utilized. In applications sensitive to air entrapment, de-airing with 28 to 30 inches Hg vacuum is required.

    4. Testing

      Due to the wide variety of substrate types and differences in substrate surface conditions, general statements on adhesion and bond strength are impossible. To ensure maximum bond strength on a particular substrate, 100 percent cohesive failure of the adhesive in a lap shear or similar adhesive strength test is desired. This ensures compatibility of the adhesive with the substrate being considered. Also, this test can be used to determine minimum cure time or can detect the presence of surface contaminants such as mold release agents, oils, greases and oxide films.

  • Comparable Materials for Dow Dowsil Q5-8401 Adhesive

    *See Terms of Use Below

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
120°C Heat cure
Cure Time Test Methods
Cure Time Test Method
90 min Heat cure
Work / Pot Time Test Methods
Work / Pot Time Test Method Temperature
1,440 min Working Time 25°C
Viscosity Test Methods
Viscosity Test Method
77,425 cPs Mixed
Shear Strength Test Methods
Shear Strength Type Substrate Test Method
830 psi Lap shear strength Aluminum Unprimed Adhesion
Tear Strength Test Methods
Tear Strength Test Method
20 (ppi) Die B
Modulus Test Methods
Modulus Test Method
420 psi Tensile Modulus
Specific Gravity Test Methods
Specific Gravity Test Method
1.310 Cured