Dow Dowsil SE 1720 CV

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Description for Dow Dowsil SE 1720 CV

• Two-part • Flowable • 1:1 mix ratio • Heat cure • Energy and time savings when cured at lower temperature or times

Brand	Dowsil
Application Type	Sealing, Gaskets, Bonding
1 Part or 2 Part	2 Part
Material Form	Liquid
Substrate	Ceramics, Glass, Reactive metals, Plastics, Many reactive metals, Selected plastics
Industry	Circuit boards, Connectors, Electronic components, Flyback transformer, ECUs, Sealing PCB module components, Electronic modules, Electronics parts
Manufacturer	Dow
Chemistry	Silicone
Cure Method	Heat, 2-Part Cure
Cure Temperature (°C)	Faster or lower, 70, 80, 100
Cure Time (min)	Fast, 50, 30, 10
Viscosity (cPs)	85,000, Non-slump, 89,700
Color	White
High Temperature Resistance (°C)	200
Low Temperature Resistance (°C)	-45, -55

Best Practices for Dow Dowsil SE 1720 CV

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Technical Data for Dow Dowsil SE 1720 CV

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Overview

Application Type
- Gasketing - Gaskets
- Adhesive - Bonding
- Sealant - Sealing
1 Part or 2 Part
- 1 Part or 2 Part - 2 Part
Material Form
- Liquid
Substrate
- Ceramic - Ceramics
- Glass
- Metal - Reactive metals
- Plastic - Plastics, Many reactive metals, Selected plastics
- Other - Laminates, Selected resins
Industry
- Electronic Control Unit - ECUs
- Electronics - Electronic components, Electronic modules, Electronics parts
- Printed Circuit Board (PCB) - Circuit boards, Sealing PCB module components
- Connectors
- Transformers - Flyback transformer
- Power Supplies - Power modules
- Industrial - Condensers, Housing seals, Lids
- Other - Bonding agent for key pad of PC, Sealing ceramic condensers
Chemistry
- Silicone
Application Method
- Dispenser - Automated or manual needle dispense
Cure Method
- Heat
- 2-Part Cure
Color
- White
Brand
- Dowsil

Specifications

Cure Specs

Cure Temperature (°C)	Faster or lower, 70, 80, 100
Cure Time (min)	Fast, 50, 30, 10
Viscosity (cPs)	85,000, Non-slump, 89,700	Test Method
Tack Free Time (min)	Fast	Test Method
Work / Pot Time (min)	360	Test Method
Mix Ratio	1:1 (by volume)

Bond Strength

General Bond Strength (psi)	High
Shear Strength (psi)	240	Test Method
Tensile Strength (psi)	480

Material Resistance

Environmental Resistance	Environmental resistance
High Temperature Resistance (°C)	200
Low Temperature Resistance (°C)	-45, -55
Moisture/Humidity Resistance	Moisture resistance

Conductivity

Dissipation Factor	0.00200	Test Method
Dielectric Strength (V/mil)	Good, Durable, 650
Dielectric Constant	2.70	Test Method
Volume Resistivity (O)	3.0 E+16 (ohms/cm)

Hardness

Elongation (%)	375
Flexibility	Flexible

Other Properties

Specific Gravity	1.060	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)	9

Not Good For

Don't Use With	Plastic, rubber

Best Practices for Dow Dowsil SE 1720 CV

*See Terms of Use Below
1. 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.
2. Mixing
  
  Dow silicone 1:1 adhesives are supplied in two parts that do not require lot matching. The 1:1 mix ratio, by weight or volume, simplifies the proportioning process. To ensure uniform distribution of filler, Parts A and B must each be thoroughly mixed prior to their combination in a 1:1 ratio. When thoroughly blended, the Part A and B liquid mixture should have a uniform appearance. The presence of light colored streaks or marbling indicates inadequate mixing and will result in incomplete cure. For fast-curing adhesives automated mix and dispense equipment should be utilized.
3. Deairing/Degassing
  
  In applications sensitive to air entrapment, de-airing with 28 to 30 inches Hg vacuum is required.
4. 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, 100 percent cohesive failure of the adhesive in a lap shear or similar adhesive strength test is desired. This ensures compatibility of the adhesive with the substrate being considered. Also, this test can be used to determine minimum cure time or can detect the presence of surface contaminants such as mold release agents, oils, greases and oxide films.
Comparable Materials for Dow Dowsil SE 1720 CV

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Spec Engine^® Results
- Sylgard 577 Primerless Silicone Adhesive Kit(Dow)
  A Gray, flowable adhesive with high tensile strength and good flame resistance, MIL-PRF-23586F tested.
- Dowsil EA-6052 Fast Low-Temp Cure Adhesive(Dow)
  A two-part, 1:1 mix, black, flowable adhesive with high tensile strength and UV indicator for inspection.
- Dowsil Q5-8401 Adhesive(Dow)
  • Flowable • 1:1 mix ratio • Heat cure • High tensile strength • 2-part • Dark gray • Heat cure •
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