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Description for Dow Dowsil 3140 RTV Coating
• A one part component • Room temperature cure • coating with good flowability • Polydimethylsiloxane adhesive • Pin sealing • self-leveling • solder joint coverage • good flame resistanceBrand Dowsil Chemical Resistance Good Application Type Adhesive, Coating, Encapsulant, Sealing 1 Part or 2 Part 1-Part Material Form Liquid, Silicone elastomer Substrate Ceramics, Glass, Many reactive metals, Plastics, Resins Industry Protection of rigid and flexible circuit boards, Pin sealing, E-Mobility Solutions, Smart Meters, Insulation, Smart Home Devices, Headlamp assemblies, Improved pin/solder joint coverage, Improved pin/solder joint coverage, Protection of corrosion-sensitive components Manufacturer Dow Chemistry Polydimethylsiloxane, Silicone elastomer, Solvent-free Application Method Flow: Simple flow coating Cure Method Moisture Cure, RTV, Room temperature cure, Heat Cure Temperature (°C) At room temperature Cure Time (min) 1,440 to 4,320 Viscosity (cPs) Good flowability, 34,400, Smooth, Self-leveling Fluorescent UV indicator for manual and automated inspection Color Clear to slightly hazy, Translucent, Clear to slightly hazy High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) 45 Volume Resistivity (O) 2.1e10 (14), (ohm*cm) Key Specifications 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), IPC (Association Connecting Electronics Industries): IPC-CC-830B, U: 746, 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), Mil-Spec (United States Military Standard): A-46146: MIL-A-46146, UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: UL 94 V-1, IPC (Association Connecting Electronics Industries): IPC-CC-830 -
Technical Data for Dow Dowsil 3140 RTV Coating
Overview
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Chemical Resistance
- Chemical Resistance - Good
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Application Type
- Coating
- Adhesive
- Pottant / Encapsulant - Encapsulant
- Sealant - Sealing
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1 Part or 2 Part
- 1-Part
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Material Form
- Elastomer - Silicone elastomer
- Liquid
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Industry
- Smart Meters
- Smart Home Devices
- E-Mobility Solutions
- Headlamp - Headlamp assemblies
- Electronics - Improved pin/solder joint coverage, Protection of rigid and flexible circuit boards, Protection of corrosion-sensitive components
- Printed Circuit Board (PCB) - Pin sealing
- Insulation
- Joints - Improved pin/solder joint coverage
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Chemistry
- Solvent-Free
- Other - Polydimethylsiloxane
- Silicone - Silicone elastomer
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Application Method
- Dispenser - Syringe dispensed
- Brush
- Spray - Spraying
- Flow
- Flow : Flow Coat - Simple flow coating
- Dip - Dipping
- Other - Needle
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Cure Method
- Room Temperature / Air Dry - Room temperature cure
- Moisture / Condensation Cure - Moisture Cure
- Heat
- RTV (Room Temperature Vulcanization) - RTV
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Color
- Translucent
- Clear / Transparent - Clear to slightly hazy
- Off-White - Clear to slightly hazy
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Key Specifications
- 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), UL 94 V-1
- IPC (Association Connecting Electronics Industries) : CC-830B - IPC-CC-830B, U: 746
- 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)
- Mil-Spec (United States Military Standard) : A-46146 : MIL-A-46146 Group II - MIL-A-46146
- IPC (Association Connecting Electronics Industries) : CC-830A - IPC-CC-830
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Brand
- Dowsil
Specifications
Cure Specs
Cure Temperature (°C) At room temperature Test Method Cure Time (min) 1,440 to 4,320 Test Method Viscosity (cPs) Good flowability, 34,400, 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 UV Resistance UV resistance Environmental Resistance Environmental resistance High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) 45 Moisture/Humidity Resistance Moisture/humidity resistance Conductivity
Dissipation Factor 0.00400, 0.00100 Test Method Dielectric Strength (V/mil) 385 Dielectric Constant 2.52, 2.52 Test Method Volume Resistivity (O) 2.1e10 (14), (ohm*cm) Hardness
Shore A Hardness 32 Test Method Elongation (%) 419 Test Method 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 With Non-reactive metal substrates , Non-reactive plastic, Plastic substrates that are highly plasticized, Rubber substrates that are highly plasticized -
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Best Practices for Dow Dowsil 3140 RTV Coating
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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.
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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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Comparable Materials for Dow Dowsil 3140 RTV Coating
Spec Engine® Results
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Cure Temperature Test Methods
Cure Temperature | Cure Time Test Method |
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At room temperature |
Cure Time Test Methods
Cure Time | Test Method |
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1,440 to 4,320 min |
Tack Free Time Test Methods
Tack Free Time | Tack Free Temperature | Test Method |
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116 min | 25°C |
Peel Strength Test Methods
Peel Strength | Type | Test Method |
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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 |
Elongation Test Methods
Elongation | Test Method |
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419 % |
Modulus Test Methods
Modulus | Test Method |
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103 psi | Tensile Modulus |
Shore A Hardness Test Methods
Shore A Hardness | Shore Hardness Test Method |
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32 | Durometer |
Specific Gravity Test Methods
Specific Gravity | Test Method |
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1.050 | Cured |