Dow Dowsil SE 9157 Conformal Coating

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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 elastomer

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Brand	Dowsil
Application Type	Conformal coating
1 Part or 2 Part	1-Part
Material Form	Liquid, Silicone elastomer
Substrate	Low surface energy surfaces
Industry	Connectors, Electronic components, Rigid circuit boards, Sensors, 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	Moisture cure, RTV, 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

Best Practices for Dow Dowsil SE 9157 Conformal Coating

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Technical Data for Dow Dowsil SE 9157 Conformal Coating

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Overview

Application Type
- Conformal Coating
1 Part or 2 Part
- 1-Part
Material Form
- Elastomer - Silicone elastomer
- Liquid
Substrate
- Low Surface Energy - Low surface energy surfaces
- Other - Other substrates, Most common substrates
Industry
- Electronics - Electronic components, Spot protection on components, Interconnections, Most delicate components
- Connectors
- Printed Circuit Board (PCB) - Flexible circuit boards, Rigid circuit boards, Printed circuits, PCB system assemblies
- Sensors
Chemistry
- Solvent-Free - No added solvents
- Silicone
Application Method
- Brush
- Spray
- Flow : Flow Coat - Flow coating
- Dip - May be dip coated with special precautions
- Other - Syringe
Cure Method
- Room Temperature / Air Dry - RT cure
- Moisture / Condensation Cure - Moisture cure
- RTV (Room Temperature Vulcanization) - RTV
Color
- Translucent
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

Best Practices for Dow Dowsil SE 9157 Conformal Coating

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1. 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.
2. 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.
Comparable Materials for Dow Dowsil SE 9157 Conformal Coating

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Spec Engine^® Results
- Dowsil SE 9187 L Adhesive(Dow)
  One-part, black, clear (translucent) or white, fast tack-free, controlled volatility adhesive with very low viscosity.
- Dowsil HC 1100 Conformal Coating(Dow)
  One-part, gray, fast, tack-free conformal coating with controlled volatility and medium viscosity, Solventless RTV elastomeric conformal coatings require atmospheric moisture to cure, needing no expensive ovens, and various viscosity versions facilitate different application methods
- Dowsil HC 2100 Coating(Dow)
  A one-part, translucent, fast tack free low viscosity conformal coating with controlled volatility, Cures to soft, low stress elastomer, RT cure.
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