Dow Dowsil 3-4680 Silicone Gel

Dow Dowsil 3-4680 Silicone Gel Datasheet
  • Description for Dow Dowsil 3-4680 Silicone Gel

    • Two-part • Transparent blue • 1:1 mix ratio • Fast room temperature cure • Low viscosity • Silicone Gel •

    *See Terms of Use Below

    Brand Dowsil
    Application Type Seal
    1 Part or 2 Part 2 Part
    Material Form Gel
    Industry Isolate circuits, Various PCB system assemblies, E-Mobility Solutions, Smart Meters, 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
    Light Refractive Index (RI) High
  • Technical Data for Dow Dowsil 3-4680 Silicone Gel

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 2 Part
    • Material Form
      • Gel
    • Industry
      • E-Mobility Solutions
      • Electronics - Isolate circuits, Optoelectronics, Various PCB system assemblies
      • Smart Meters
      • Smart Home Devices
      • Industrial - Delicate components
    • Application Method
      • Dispenser - Automated dispensing equipment
    • Cure Method
      • 2-Part Cure
    • Color
      • Blue - Transparent blue
      • Clear / Transparent - Transparent blue
    • Brand
      • Dowsil
    • 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
  • Best Practices for Dow Dowsil 3-4680 Silicone Gel

    *See Terms of Use Below

    1. 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.

    2. 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.

    3. 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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    *See Terms of Use Below

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
20 to 25°C Room temperature
125°C Heat Cure
Cure Time Test Methods
Cure Time Test Method
Fast
1.00 min Heat Cure
Viscosity Test Methods
Viscosity Test Method
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
Set Time Test Methods
Set Time Set Temperature Test Method
8 min 25°C Gel Time
Dielectric Constant Test Methods
Dielectric Constant Test Method
2.75 Dielectric Constant at 100 Hz
2.75 Dielectric Constant at 100 kHz
Dissipation Factor Test Methods
Dissipation Factor Test Method
0.00040 Dissipation Factor at 100 hz
<0.00006 Dissipation Factor at 100 kHz
Specific Gravity Test Methods
Specific Gravity Test Method
0.970 Uncured Part A or Base
0.970 Uncured Part B or Catalyst