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Description for Dow Dowsil 3-1944 RTV Coating
Coating or adhesive with added UV indicator, good flowability, fast tack free time, good flame resistance, MIL A-46058 tested, Require atmospheric moisture to cure needing no expensive ovens, and various viscosity<br/>version faciliate different application methods.Brand Dowsil Application Type Adhesive, Coating, Gaskets 1 Part or 2 Part 1-Part Material Form Liquid, Silicone elastomer Substrate Ceramics, Glass, Reactive metals, Plastics, Resins Industry Circuit board, Light Emitting Diodes (LEDs), PCB system assemblies, Smart Meters, E-Mobility Solutions, Smart Home Devices, Insulation, Headlamp assemblies, Pin joint coverage, CRT module, Solder joint coverage, Electronic equipment, Electronics, LCD module, Modules, PDP module, Power supplies, Most delicate components, Interconnections Manufacturer Dow Chemistry Silicone elastomer, Solventless Application Method Flow: Flow Coating Cure Method RTV, Atmospheric moisture, Heat, Room temp cure Cure Temperature (°C) Faster or lower, 20 to 25, 20 to 25 Cure Time (min) 1,440 Viscosity (cPs) 63,775, Good flowability, Self-leveling after dispensing Color Translucent High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45, -55 Volume Resistivity (O) 1.6e15 (ohms/cm) Stress Relief Low stress Elastomeric Elastomer Key Specifications Mil-Spec (United States Military Standard): Mil I-46058C Amend 7, UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: UL 94 V-0; UL Flammability Classification, IPC (Association Connecting Electronics Industries): IPC-CC-830B; Agency Listing, UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 746E; Agency Listing , UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 746 and Mil Spec tested -
Technical Data for Dow Dowsil 3-1944 RTV Coating
Overview
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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
- LED (Light-Emitting Diodes) - Light Emitting Diodes (LEDs)
- Smart Meters
- Smart Home Devices
- E-Mobility Solutions
- Headlamp - Headlamp assemblies
- Electronics - Circuit board, CRT module, Electronic equipment, LCD module, Modules, PDP module, Power supplies, Interconnections, Most delicate components
- Printed Circuit Board (PCB) - PCB system assemblies
- Power Supplies
- Industrial - Housings, Lids
- Insulation
- Joints - Pin joint coverage, Solder joint coverage
- Other - Thin section encapsulation, Spot protection of other devices, Spot protection of pins
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Chemistry
- Solvent-Free - Solventless
- Silicone - Silicone elastomer
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Application Method
- Brush
- Flow : Flow Coat - Flow Coating
- Other - Syringe or needle
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Cure Method
- Room Temperature / Air Dry - Room temp cure
- Moisture / Condensation Cure - Atmospheric moisture
- Heat
- RTV (Room Temperature Vulcanization) - RTV
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Color
- Translucent
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Key Specifications
- Mil-Spec (United States Military Standard) : I-46058-C - Mil I-46058C Amend 7
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) : UL 94 : V0 - UL 94 V-0; UL Flammability Classification
- IPC (Association Connecting Electronics Industries) : CC-830B - IPC-CC-830B; Agency Listing
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) : 746E - UL 746E; Agency Listing
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) : 746 - UL 746 and Mil Spec tested
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Brand
- Dowsil
Specifications
Cure Specs
Cure Temperature (°C) Faster or lower, 20 to 25, 20 to 25 Cure Time (min) 1,440 Viscosity (cPs) 63,775, Good flowability, Self-leveling after dispensing Tack Free Time (min) Fast, 14, 0.50 Test Method Thixotropic Limited, Moderate Bond Strength
General Bond Strength (psi) Good Peel Strength (piw) 3 (N/cm) Test Method Tensile Strength (psi) 325 Material Resistance
Flame Resistance Good Environmental Resistance Environmentally friendly High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45, -55 Moisture/Humidity Resistance Moisture/humidity resistance Conductivity
Dissipation Factor 0.00130, <0.00020 Test Method Dielectric Strength (V/mil) 525 Dielectric Constant 2.67, 2.73 Test Method Volume Resistivity (O) 1.6e15 (ohms/cm) Hardness
Stress Relief Low stress Shore A Hardness 36 Test Method Elastomeric Elastomer Elongation (%) 145 Flexibility Soft Modulus (psi) 223 Test Method Other Properties
Specific Gravity 1.030 Business Information
Shelf Life Details Shelf life is indicated by the “Use Before” date found on the product label. Shelf Life Temperature (°F) 77 Shelf Life (mon) 12 Not Good For
Don't Use With Plastic, rubber -
Best Practices for Dow Dowsil 3-1944 RTV Coating
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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.
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Mixing
No mixing required
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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.
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Curing
Time to cure is dependent on several variables including the method of application, film thickness, temperature and humidity. Tack-free time in the data table gives an indication of typical times until surface is dry enough to handle. Cure time for full cure are indications of time needed to develop full physical properties such as durometer, tensile strength or adhesion. These times, including full cure time, can be significantly improved by introducing mild heat of 60°C or less.
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Tack Free Time Test Methods
Tack Free Time | Tack Free Temperature | Test Method |
---|---|---|
Fast | ||
14 min | 25°C | |
0.50 min | 60°C | 15% RH |
Peel Strength Test Methods
Peel Strength | Type |
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3 (N/cm) | 180 Degree Peel Strength |
Dielectric Constant Test Methods
Dielectric Constant | Test Method |
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2.67 | Dielectric constant, 100 Hz |
2.73 | Dielectric constant, 100 KHz |
Dissipation Factor Test Methods
Dissipation Factor | Test Method |
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0.00130 | Dissipation factor, 100 Hz |
<0.00020 | Dissipation factor, 100 KHz |
Modulus Test Methods
Modulus | Test Method |
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223 psi | Youngs Modulus |
Shore A Hardness Test Methods
Shore A Hardness | Shore Hardness Test Method |
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36 | Durometer |