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Description for Dow 3145 RTV Clear Adhesive/Sealant
Noncorrosive; high tensile strength, elongation, peel and lap shear values, contains UV indicator for automated inspection; non-flow.Application Type Bond, Seal, Gaskets 1 Part or 2 Part 1-Part Material Form Pre-Cure: Paste, Post-Cure: Elastomer Substrate Aluminum, Ceramics, Glass, Reactive metals, Selected plastics, Resins Industry Circuit boards, Light Emitting Diodes (LEDs), Smart Meters, E-Mobility Solutions, Smart Home Devices, Power Tools, CRT module, Electrical leads, Electronic equipment, Electronics, LCD module, Modules, PDP module, Power supplies, PWBs Manufacturer Dow Chemistry Silicone elastomer Cure Method RTV, Moisture Cure Temperature (°C) Faster or lower, 20 to 25, 20 to 25 Viscosity (cPs) Non-flow Color Clear High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45, -55 Volume Resistivity (O) 4.4E+14 (ohms/cm) Key Specifications Mil-Spec (United States Military Standard): MIL-A-46146 Group II; Mil Spec A-46146 QPL, Mil-Spec (United States Military Standard): A-46146: MIL-A-46146 Group II; Mil Spec A-46146 QPL -
Technical Data for Dow 3145 RTV Clear Adhesive/Sealant
Overview
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1 Part or 2 Part
- 1-Part
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Material Form
- Elastomer - Post-Cure: Elastomer
- Paste - Pre-Cure: Paste
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Industry
- LED (Light-Emitting Diodes) - Light Emitting Diodes (LEDs)
- Smart Meters
- Smart Home Devices
- E-Mobility Solutions
- Electronics - Circuit boards, CRT module, Electrical leads, Electronic equipment, LCD module, Modules, PDP module, Power supplies, PWBs
- Power Supplies
- Industrial - Housings, Yoke
- Power Tools
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Chemistry
- Silicone - Silicone elastomer
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Application Method
- Dispenser - Automated dispense, manual needle dispense
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Cure Method
- Moisture / Condensation Cure - Moisture
- RTV (Room Temperature Vulcanization) - RTV
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Color
- Clear / Transparent - Clear
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Key Specifications
- Mil-Spec (United States Military Standard) : A-46146-QPL - MIL-A-46146 Group II; Mil Spec A-46146 QPL
- Mil-Spec (United States Military Standard) : A-46146 : MIL-A-46146 Group II - MIL-A-46146 Group II; Mil Spec A-46146 QPL
Specifications
Cure Specs
Cure Temperature (°C) Faster or lower, 20 to 25, 20 to 25 Cure Time (min) Viscosity (cPs) Non-flow Tack Free Time (min) Fast Test Method Bond Strength
Peel Strength (piw) High Shear Strength (psi) High, 1,990 Test Method Tear Strength (piw) 223 (ppi), High Test Method Tensile Strength (psi) High, 864 Material Resistance
Non-Corrosive Non-corrosive Environmental Resistance Environmental resistance High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45, -55 Moisture/Humidity Resistance Moisture/humidity resistance Conductivity
Dissipation Factor 0.00050, <0.00020 Test Method Dielectric Strength (V/mil) Good, Durable Dielectric Constant 2.83, 2.83 Test Method Volume Resistivity (O) 4.4E+14 (ohms/cm) Hardness
Shore A Hardness 46 Elongation (%) High, 626 Flexibility Flexible Modulus (psi) 138 Test Method Other Properties
Specific Gravity 1.100 Coefficient of Thermal Expansion (CTE) 375 (Linear (micron/m °C or ppm )) 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. Shelf Life Temperature (°F) <90 Shelf Life Type From date of manufacture Shelf Life (mon) 12 Not Good For
Don't Use With Non-reactive plastic surfaces, Rubber substrates that are highly plasticized, Plastic substrates that are highly plasticized, Polypropylene, Polyethylene, Teflon -
Best Practices for Dow 3145 RTV Clear Adhesive/Sealant
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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
Upon standing, some filler may settle to the bottom of the liquid containers after several weeks. To ensure a uniform product mix, the material in each container should be thoroughly mixed prior to use. Two-part materials should be mixed in the proper ratio (1:1 or 10:1) either by weight or volume. The presence of light colored streaks or marbling indicates inadequate mixing.
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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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Tack Free Time Test Methods
Tack Free Time | Tack Free Temperature |
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Fast |
Tear Strength Test Methods
Tear Strength | Test Method |
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223 (ppi) | Die B |
High |
Shear Strength Test Methods
Shear Strength | Type | Substrate |
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High | Lap shear strength | |
1,990 psi | Lap Shear strength | Aluminum |
Dielectric Constant Test Methods
Dielectric Constant | Test Method |
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2.83 | Dielectric Constant 100 Hz |
2.83 | Dielectric Constant 100 KHz |
Dissipation Factor Test Methods
Dissipation Factor | Test Method |
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0.00050 | Dissipation Factor 100 Hz |
<0.00020 | Dissipation Factor 100 KHz |
Modulus Test Methods
Modulus | Test Method |
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138 psi | Tensile Modulus |