Dow Dowsil 3140 RTV Coating

Dow Dowsil 3140 RTV Coating Datasheet
  • Description for Dow Dowsil 3140 RTV Coating

    One-part, translucent adhesive or coating with good flowability, good flame resistance, UL, IPC and Mil spec tested.

    *See Terms of Use Below

    Brand Dowsil
    Application Type Adhesive, Coating, Encapsulant, Sealing, Selected laminates
    1 Part or 2 Part 1 Part
    Material Form Liquid, Silicone elastomer
    Substrate Ceramics, Glass, Many reactive metals, Plastics
    Industry Protection of rigid and flexible circuit boards, Smart Meters, E-Mobility Solutions, Insulation
    Manufacturer Dow
    Chemistry Polydimethylsiloxane, Silicone elastomer, Solvent-free
    Application Method Flow: Simple flow coating
    Cure Method RTV, Pressure sensitive, Moisture Cure, Heat (optional), Room temperature cure
    Cure Temperature (°C) 20 to 25, 25
    Cure Time (min) Fast, 4,320
    Viscosity (cPs) High, 34,400, Good flowability, Smooth, Self-leveling
    Fluorescent UV indicator for manual and automated inspection
    Color Clear to slightly hazy, Clear to slightly hazy, Translucent
    Ozone Resistance Ozone resistance
    Chemical Resistance Good
    High Temperature Resistance (°C) 200
    Low Temperature Resistance (°C) -45, -55
    Key Specifications Mil-Spec (United States Military Standard): Mil-I-46058C, UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94-HB @ 1.9 mm (UL file QMFZ2 – E40195), IPC (Association Connecting Electronics Industries): IPC-CC-830B, U: 746, UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: UL 94 V-1 @ 1.4 mm (UL file QMJU2 - E81611)
  • Technical Data for Dow Dowsil 3140 RTV Coating

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Elastomer - Silicone elastomer
      • Liquid
    • Substrate
    • Industry
      • E-Mobility Solutions
      • Electronics - Protection of rigid and flexible circuit boards
      • Smart Meters
      • Insulation
      • Other - Improved pin/solder joint coverage, Protection of corrosion-sensitive components, Pin sealing
    • Chemistry
    • Application Method
      • Dispenser - Robotic dispensing, Syringe dispensed, Select coating
      • Brush
      • Spray - Spraying
      • Flow: Flow Coat - Simple flow coating
      • Dip - Dipping
      • Other - Needle
    • Cure Method
      • Pressure Sensitive (min) - Pressure sensitive
      • Room Temperature / Air Dry - Room temperature cure
      • Moisture - Moisture Cure
      • Heat - Heat (optional)
      • RTV (Room Temperature Vulcanization) - RTV
    • Color
      • Translucent
      • Clear / Transparent - Clear to slightly hazy
      • Off-White - Clear to slightly hazy
    • Key Specifications
      • Mil-Spec (United States Military Standard): I-46058-C - Mil-I-46058C
      • UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94 HB - UL 94-HB @ 1.9 mm (UL file QMFZ2 – E40195)
      • IPC (Association Connecting Electronics Industries): CC-830B - IPC-CC-830B, U: 746
      • UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: V-1 - UL 94 V-1 @ 1.4 mm (UL file QMJU2 - E81611)
    • Brand
      • Dowsil
    Specifications
    Cure Specs
    Cure Temperature (°C) 20 to 25, 25 Test Method
    Cure Time (min) Fast, 4,320 Test Method
    Viscosity (cPs) High, 34,400, Good flowability, Smooth, Self-leveling
    Tack Free Time (min) 116 Test Method
    Fluorescent UV indicator for manual and automated inspection
    Bond Strength
    General Bond Strength (psi) Good
    Peel Strength (piw) 40 (ppi) Test Method
    Tensile Strength (psi) 434
    Material Resistance
    Flame Resistance Good flame resistance
    Ozone Resistance Ozone resistance
    Chemical Resistance Good
    UV Resistance UV 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 0.00400, 0.00100 Test Method
    Dielectric Strength (V/mil) Good, Durable dielectric insulation, 385
    Dielectric Constant 2.52, 2.52 Test Method
    Volume Resistivity (O) 2.1e14 (ohm*cm)
    Hardness
    Shore A Hardness 32 Test Method
    Elongation (%) 419
    Modulus (psi) 103 Test Method
    Other Properties
    Specific Gravity 1.050 Test Method
    Flash Point (°F) 213.8
    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., For best results, Dow adhesives should be stored at or below the storage temperature listed on the product label.
    Shelf Life Temperature (°F) 77 Room Temperature
    Shelf Life Type from date of manufacture, Shelf Life Type
    Shelf Life (mon) 12
    Not Good For
    Don't Use For Selected Plastics, Non-reactive plastic, Plastic substrates that are highly plasticized, Rubber substrates that are highly plasticized
  • Best Practices for Dow Dowsil 3140 RTV Coating

    *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. Testing

      Substrate 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, cohesive failure of the product in a lap shear or similar test is needed to ensure compatibility of the adhesive with the substrate being considered. Also, this test can be used to determine minimum cure time or to detect the presence of surface contaminants such as mold release agents, oils, greases and oxide films.

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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 Typical for a 5-mil thickness sample in 180° peel.
25°C
Cure Time Test Methods
Cure Time Test Method
Fast
4,320 min Typical for a 5-mil thickness sample in 180° peel.
Tack Free Time Test Methods
Tack Free Time Tack Free Temperature
116 min 25°C
Peel Strength Test Methods
Peel Strength Type Test Method
40 (ppi) 180 Degree Peel Strength Unprimed Adhesion
Dielectric Constant Test Methods
Dielectric Constant Test Method
2.52 at 100 Hz
2.52 at 100 kHz
Dissipation Factor Test Methods
Dissipation Factor Test Method
0.00400 at 100 Hz
0.00100 at 100 kHz
Modulus Test Methods
Modulus Test Method
103 psi Tensile Modulus
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method
32 Durometer
Specific Gravity Test Methods
Specific Gravity Test Method
1.050 Cured