Dow Dowsil 3-4680 Silicone Gel

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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, E-Mobility Solutions, 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

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.
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.
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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Technical Data

Overview

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Specifications

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Best Practices

*See Terms of Use Below
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Comparable Materials

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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

Set Time Test Methods

Set Time	Set Temperature	Test Method
8 min	25°C	Gel Time

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

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

Dow Dowsil 3-4680 Silicone Gel

Description for Dow Dowsil 3-4680 Silicone Gel

Best Practices for Dow Dowsil 3-4680 Silicone Gel

Mixing

Deairing/Degassing

Testing

Register for FREE to view more details

Why register?

Sign up now Already registered? Sign in!

Technical Data

Overview

euismod aliquam.

ut euismod ut tincidunt.

adipiscing erat.

Specifications

euismod aliquam sit.

aliquam.

laoreet.

Best Practices

tincidunt amet ut.

elit dolor sit diam.

aliquam sit lorem dolore aliquam magna.

Comparable Materials

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Gluespec Poll

What level of expertise do you have in specialty chemicals like adhesives, sealants, conformal coatings, etc.?

Cure Temperature Test Methods

Cure Time Test Methods

Set Time Test Methods

Viscosity Test Methods

Work / Pot Time Test Methods

Dielectric Constant Test Methods

Dissipation Factor Test Methods

Specific Gravity Test Methods

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