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Description for Dow Dowsil SE 9157 Conformal Coating
• One component • Fast tack-free RT cure • Medium viscosity • No added solvents • Conformal coating • Translucent • Cures to soft, low stress elastomerBrand Dowsil Application Type Conformal coating 1 Part or 2 Part 1-Part Material Form Liquid, Silicone elastomer Substrate Low surface energy surfaces Industry Electronic components, Sensors, Rigid circuit boards, Connectors, Most delicate components, Flexible circuit boards, Interconnections, PCB system assemblies, Spot protection on components, Printed circuits Manufacturer Dow Chemistry Silicone, No added solvents Application Method Flow: Flow coating Cure Method RTV, Moisture cure, RT cure Cure Temperature (°C) 20 to 25 RT Cure Time (min) Fast, 4,320 Viscosity (cPs) Medium, 5,675 Color Translucent Ozone Resistance Ozone resistance High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45, -55 Other Resistance Mechanical protection Volume Resistivity (O) 4.0 E15 (ohm*cm) Stress Relief Low stress Repairability Excellent Elastomeric Elastomeric -
Technical Data for Dow Dowsil SE 9157 Conformal Coating
Overview
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Application Type
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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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Substrate
- Low Surface Energy - Low surface energy surfaces
- Other - Other substrates, Most common substrates
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Industry
- Electronics - Electronic components, Spot protection on components, Interconnections, Most delicate components
- Sensors
- Printed Circuit Board (PCB) - Flexible circuit boards, Rigid circuit boards, Printed circuits, PCB system assemblies
- Connectors
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Chemistry
- Solvent-Free - No added solvents
- Silicone
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Application Method
- Brush
- Spray
- Flow : Flow Coat - Flow coating
- Dip - May be dip coated with special precautions
- Other - Syringe
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Cure Method
- Room Temperature / Air Dry - RT cure
- Moisture / Condensation Cure - Moisture cure
- RTV (Room Temperature Vulcanization) - RTV
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Color
- Translucent
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Brand
- Dowsil
Specifications
Cure Specs
Cure Temperature (°C) 20 to 25 RT Cure Time (min) Fast, 4,320 Viscosity (cPs) Medium, 5,675 Test Method Tack Free Time (min) Fast, 6 Test Method Bond Strength
Tensile Strength (psi) 90 Test Method Material Resistance
Ozone Resistance Ozone resistance UV Resistance UV resistance Environmental Resistance Environmental protection High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45, -55 Moisture/Humidity Resistance Moisture/humidity resistance Other Resistance Mechanical protection Conductivity
Dissipation Factor 0.00060 Test Method Dielectric Strength (V/mil) 675 Test Method Dielectric Constant 2.70 Test Method Volume Resistivity (O) 4.0 E15 (ohm*cm) Test Method Hardness
Stress Relief Low stress Repairability Excellent Shore A Hardness 25 Test Method Elastomeric Elastomeric Elongation (%) 180 Test Method Flexibility Soft Modulus (psi) 50 Test Method Other Properties
Specific Gravity 0.995 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) 77 Shelf Life (mon) 12 -
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Best Practices for Dow Dowsil SE 9157 Conformal Coating
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Application
Repairability: In the manufacture of PCB system assemblies, it is often desirable to salvage or reclaim damaged or defective units. Dow conformal coatings offer excellent repairability because they can be removed from substrates and circuitry by scraping or cutting, or by using solvents or stripping agents. If only one circuit component is to be replaced, a soldering iron may be applied directly through the coating to remove the component. After the circuit board has been repaired, the area should be cleaned by brushing or by using solvent, then dried and recoated. Heat cure coatings can be repaired with RTV coatings, but heat cure coatings may not work well when used to repair RTV coatings.
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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 | ||
6 min | 25°C | These values are not intended for use in preparing specifications. |
Viscosity Test Methods
Viscosity | Test Method |
---|---|
Medium | |
5,675 cPs | These values are not intended for use in preparing specifications. |
Tensile Strength Test Methods
Tensile Strength | Test Method |
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90 psi | These values are not intended for use in preparing specifications. |
Dielectric Constant Test Methods
Dielectric Constant | Test Method |
---|---|
2.70 | @ 1MHz (JIS K 6249), These values are not intended for use in preparing specifications. |
Dielectric Strength Test Methods
Dielectric Strength | Test Method |
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675 V/mil | JIS K 624, These values are not intended for use in preparing specifications. |
Dissipation Factor Test Methods
Dissipation Factor | Test Method |
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0.00060 | @ 1MHZ (JIS K 6249), These values are not intended for use in preparing specifications |
Volume Resistivity Test Methods
Volume Resistivity | Test Method |
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4.0 E15 (ohm*cm) | JIS K 6249, These values are not intended for use in preparing specifications. |
Elongation Test Methods
Elongation | Test Method |
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180 % | These values are not intended for use in preparing specifications. |
Modulus Test Methods
Modulus | Test Method |
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50 psi | Tensile Modulus,These values are not intended for use in preparing specifications. |
Shore A Hardness Test Methods
Shore A Hardness | Shore Hardness Test Method |
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25 | Durometer, JIS, These values are not intended for use in preparing specifications. |
Specific Gravity Test Methods
Specific Gravity | Test Method |
---|---|
0.995 | Cured, These values are not intended for use in preparing specifications. |

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