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Description for Dow Dowsil 3-4680 Silicone Gel
• Two-part • Transparent blue • 1:1 mix ratio • Fast room temperature cure • Low viscosity • Silicone Gel •Brand Dowsil Application Type Seal 1 Part or 2 Part 2-Part Material Form Gel Industry Isolate circuits, Various PCB system assemblies, Smart Meters, E-Mobility Solutions, Smart Home Devices, Electronics, Optoelectronics Manufacturer Dow Chemistry Silicone, Solvent-free Cure Method 2-Part Cure Cure Temperature (°C) 20 to 25 Room temperature, 125 Cure Time (min) Fast, 1.00 Viscosity (cPs) Low, 275 Color Transparent blue, Transparent blue High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45, -55 Volume Resistivity (O) 3.6E+15 (ohms/cm) Light Refractive Index (RI) High -
Technical Data for Dow Dowsil 3-4680 Silicone Gel
Overview
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Application Type
- Sealant - Seal
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1 Part or 2 Part
- 2-Part
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Material Form
- Gel
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Industry
- Smart Meters
- Smart Home Devices
- E-Mobility Solutions
- Electronics - Isolate circuits, Optoelectronics, Various PCB system assemblies
- Industrial - Delicate components
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Chemistry
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Application Method
- Dispenser - Automated dispensing equipment
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Cure Method
- 2-Part Cure
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Color
- Blue - Transparent blue
- Clear / Transparent - Transparent blue
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Brand
- Dowsil
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Also Known As
- Old Name - 3-4680 Silicone Gel Kit
Specifications
Cure Specs
Cure Temperature (°C) 20 to 25 Room temperature, 125 Test Method Cure Time (min) Fast, 1.00 Test Method Viscosity (cPs) Low, 275 Test Method Set Time (min) 8 Test Method Work / Pot Time (min) <10 Test Method Mix Ratio 1:1 Material Resistance
High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45, -55 Moisture/Humidity Resistance Moisture/humidity resistance Conductivity
Dissipation Factor 0.00040, <0.00006 Test Method Dielectric Strength (V/mil) 400 Dielectric Constant 2.75, 2.75 Test Method Volume Resistivity (O) 3.6E+15 (ohms/cm) Hardness
Flexibility Flexible, Resilient Other Properties
Light Refractive Index (RI) High Specific Gravity 0.970, 0.970 Test Method Coefficient of Thermal Expansion (CTE) 435 (Linear (micron/m °C or ppm )) Business Information
Shelf Life Details Storage conditions and shelf life (“Use By” date) are indicated on the product label. Shelf Life Temperature (°F) 77 Shelf Life (mon) 18 -
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Best Practices for Dow Dowsil 3-4680 Silicone Gel
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Mixing
Gels can be dispensed manually or by using one of the available types of meter mix equipment. Typically, the two components are of matched viscosities and are readily mixed with static or dynamic mixers, with automated meter-mix normally used for high volume processes. For low volume applications, manual weighing and simple hand mixing may be appropriate. Inaccurate proportioning or inadequate mixing may cause localized or widespread problems affecting the gel properties or cure characteristics. If possible, the potential for entrapment and incorporation of gas (typically air) should be considered during design of the part and selection of a process to mix and dispense the gel. This is especially important with higher viscosity and faster-curing gels.
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Deairing/Degassing
Some gels are supplied in bladder packs that avoid direct air contact with the liquid gel components, allowing use of air pressure over the pack in a pressure pot for dispensing. Do not apply air pressure directly to the liquid gel surface (without the bladder pack) as the gel can become supersaturated with air and bubbling can occur when the material is dispensed and cured. Use of bladder packs prevents bubbling, maintains cleanliness and avoids gel contamination. Degassing at > 28 inches (10–20 mm) Hg vacuum may be necessary to ensure a void-free, protective layer.
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Testing
If a substrate or material is questionable with respect to potentially causing inhibition of cure, it is recommended that a small scale compatibility test be run to ascertain suitability in a given application. The presence of liquid or uncured product at the interface between the questionable substrate and the cured gel indicates incompatibility and inhibition of cure.
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Cure Temperature Test Methods
Cure Temperature | Cure Time Test Method |
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20 to 25°C Room temperature | |
125°C | Heat Cure |
Cure Time Test Methods
Cure Time | Test Method |
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Fast | |
1.00 min | Heat Cure |
Set Time Test Methods
Set Time | Set Temperature | Test Method |
---|---|---|
8 min | 25°C | Gel Time |
Viscosity Test Methods
Viscosity | Test Method |
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Low | |
275 cPs | Mixed |
Work / Pot Time Test Methods
Work / Pot Time | Test Method | Temperature |
---|---|---|
<10 min | Time to double initial viscosity initial mixed viscosity for two-part products at room temperature. This property is sometimes referred to as pot life. | 25°C |
Dielectric Constant Test Methods
Dielectric Constant | Test Method |
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2.75 | Dielectric Constant at 100 Hz |
2.75 | Dielectric Constant at 100 kHz |
Dissipation Factor Test Methods
Dissipation Factor | Test Method |
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0.00040 | Dissipation Factor at 100 hz |
<0.00006 | Dissipation Factor at 100 kHz |
Specific Gravity Test Methods
Specific Gravity | Test Method |
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0.970 | Uncured Part A or Base |
0.970 | Uncured Part B or Catalyst |