Dow Dowsil 3-6651 Thermally Conductive Elastomer

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Description for Dow Dowsil 3-6651 Thermally Conductive Elastomer

Two-part, grey, low modulus, low viscosity, good thermal conductivity, UL 94 V-0 rating.

Brand	Dowsil
Chemical Resistance	Good chemical stability
Application Type	Encapsulate
1 Part or 2 Part	2-Part
Material Form	Liquid, Polydimethylsiloxane elastomer
Industry	Protection of electrical applications where heat dissipation is critical., Sensors, Protection of PCB system assembly applications where heat dissipation is critical., High voltage transformers, Smart Meters, E-Mobility Solutions, Smart Home Devices, Heat sinks
Manufacturer	Dow
Chemistry	Polydimethylsiloxane elastomer
Cure Method	2-Part Cure, Heat Cure
Cure Temperature (°C)	120, 100, 150, 70
Cure Time (min)	60, 15, 30
Viscosity (cPs)	Low, Flowable, 32,000, 13,350
Color	Gray
Ozone Resistance	Resistant to ozone
High Temperature Resistance (°C)	200
Low Temperature Resistance (°C)	-45, -55
Volume Resistivity (O)	8.8E+14 (ohm*cm)
Key Specifications	UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: UL 94 V-0

Best Practices for Dow Dowsil 3-6651 Thermally Conductive Elastomer

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Technical Data for Dow Dowsil 3-6651 Thermally Conductive Elastomer

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Overview

Chemical Resistance
- Chemical Resistance - Good chemical stability
Application Type
- Pottant / Encapsulant - Encapsulate
1 Part or 2 Part
- 2-Part
Material Form
- Elastomer - Polydimethylsiloxane elastomer
- Liquid
Industry
- Smart Meters
- Smart Home Devices
- E-Mobility Solutions
- Electronics - Protection of electrical applications where heat dissipation is critical., Heat sinks
- Sensors
- Printed Circuit Board (PCB) - Protection of PCB system assembly applications where heat dissipation is critical.
- Transformers - High voltage transformers
- Power Supplies - Power converters
- Industrial - Gap fill
Chemistry
- Silicone - Polydimethylsiloxane elastomer
Application Method
- Dispenser - Manual Dispense, Automated meter-mix
Cure Method
- Heat - Heat Cure
- 2-Part Cure
Color
- Gray
Key Specifications
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) : UL 94 : V0 - UL 94 V-0
Brand
- Dowsil

Specifications

Cure Specs

Cure Temperature (°C)	120, 100, 150, 70	Test Method
Cure Time (min)	60, 15, 30	Test Method
Viscosity (cPs)	Low, Flowable, 32,000, 13,350	Test Method
Work / Pot Time (min)	6	Test Method
Mix Ratio	1:1 (by volume), 1:1 (by weight)

Bond Strength

Tensile Strength (psi)	85

Material Resistance

Ozone Resistance	Resistant to ozone
UV Resistance	Resistant to ultraviolet degradation
Environmental Resistance	Barriers against environmental contaminants
High Temperature Resistance (°C)	200
Low Temperature Resistance (°C)	-45, -55
Vibration Resistance/Shock Resistance	Barriers against stress-relieving shock, Barriers against vibration absorbers

Conductivity

Dissipation Factor	0.00300, <0.00010	Test Method
Dielectric Strength (V/mil)	Durable dielectric insulation, 325
Dielectric Constant	4.10, 4.10, 4.13, 4.13	Test Method
Thermal Conductivity (W/m°K)	Good, 1.10, 1.15
Volume Resistivity (O)	8.8E+14 (ohm*cm)

Hardness

Elongation (%)	2
Shore OO Hardness	53, 50
Flexibility	Flexible
Modulus (psi)	Low, 3 (Compression at (10%, psi))

Other Properties

Specific Gravity	2.400, 2.370	Test Method
Coefficient of Thermal Expansion (CTE)	175 (ppm/°C)	Test Method
Flash Point (°F)	392.0

Business Information

Shelf Life Details	Shelf life is indicated by the “Use By” date found on the product label. For best results, Dow Corning thermally conductive materials should be stored at or below the maximum specified storage temperature. Special precautions must be taken to prevent moisture from contacting these materials. Containers should be kept tightly closed and head or air space minimized. Partially filled containers should be purged with dry air or other gases, such as nitrogen. Any special storage and handling instructions will be printed on the product containers., Shelf life is indicated by the “Use By” date found on the product label. For best results, Dow thermally conductive materials should be stored at or below the maximum specified storage temperature. Special precautions must be taken to prevent moisture from contacting these materials. Containers should be kept tightly closed and head or air space minimized. Partially filled containers should be purged with dry air or other gases, such as nitrogen. Any special storage and handling instructions will be printed on the product containers.
Shelf Life Temperature (°F)	86
Shelf Life Type	From date of manufacture
Shelf Life (mon)	12, 12

Not Good For

Don't Use With	non-reactive metal substrates, non-reactive plastic surfaces, Teflon, polyethylene, polypropylene.

Best Practices for Dow Dowsil 3-6651 Thermally Conductive Elastomer

*See Terms of Use Below
1. Mixing
  
  Upon standing, some filler may settle to the bottom of the liquid after several weeks. To ensure a uniform product mix, the material in each container should be thoroughly mixed prior to use. Two-part materials should be mixed in the proper ratio either by weight or volume. The presence of light-colored streaks or marbling indicates inadequate mixing.
2. Deairing/Degassing
  
  Automated airless dispense equipment can be used to reduce or avoid the need to de-air. If de-airing is required to reduce voids in the cured elastomer, consider a vacuum de-air schedule of > 8 inches Hg (or a residual pressure of 10–0 mm of Hg) for 10 minutes or until bubbling subsides.
3. Curing
  
  Addition-cure adhesives should be cured at 100°C (212°F) or above. The cure rate is rapidly accelerated with heat. Thin sections of less than mils may be cured in 15 minutes at 150°C (30°F). For thicker sections, a precure at 70°C (158°F) may be necessary to reduce voids in the elastomer. Length of precure will depend on section thickness and confinement of adhesive. It is recommended that 30 minutes at 70°C (158°F) be used as a starting point for determining necessary pre-cure time. Addition-curing materials contain all the ingredients needed for cure with no byproducts from the cure mechanism. Deep-section or confined cures are possible. Cure progresses evenly throughout the material. These adhesives generally have long working times.
  
  Cure reaction begins with the mixing process. Initially, cure is evidenced by a gradual increase in viscosity, followed by gelation and conversion to its final state. Pot life is defined as the time required for viscosity to double after Parts A and B (base and curing agent) are mixed.
Comparable Materials for Dow Dowsil 3-6651 Thermally Conductive Elastomer

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Spec Engine^® Results
- Dowsil 3-6121 Low Temperature Elastomer(Dow)
  Two part; 10:1 mix; minimal shrinkage; no exotherm during cure; no solvents or cure byproducts; deep section cure; repairable; good dielectric properties; flexible elastomer.
- Sylgard 164 Silicone Elastomer(Dow)
  Two part; 1:1 mix; RT/HA cure; minimal shrinkage; no exotherm during cure; no solvents or cure byproducts; repairable; good dielectric properties; deep section cure; flexible elastomer.
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