Dow Dowsil 3-6512 Elastomer

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Description for Dow Dowsil 3-6512 Elastomer

Extremely soft or firm, thermal/mechanical shock and vibration damping, excellent dielectric properties, flexible cure schedule, reversion resistant, thick section cure, compatible with automated dispensing equipment, and physical and electrical stability over a wide temperature range.

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Brand	Dowsil
Application Type	Coating, Encapsulating, Seal
1 Part or 2 Part	2-Part
Material Form	Gel
Industry	Circuits, E-Mobility Solutions, Electronics, Optoelectronics
Manufacturer	Dow
Chemistry	Silicone, Solvent-free
Cure Method	Part A/Part B
Cure Temperature (°C)	20 to 25, 70
Cure Time (min)	120
Viscosity (cPs)	950
Color	Transparent Red, Transparent red
High Temperature Resistance (°C)	200
Low Temperature Resistance (°C)	-45, -55
Volume Resistivity (O)	4.3E+14 (ohms/cm)
Elastomeric	Soft Elastomer
Light Refractive Index (RI)	High

Best Practices for Dow Dowsil 3-6512 Elastomer

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Technical Data for Dow Dowsil 3-6512 Elastomer

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Overview

Application Type
- Coating
- Pottant / Encapsulant - Encapsulating
- Sealant - Seal
1 Part or 2 Part
- 2-Part
Material Form
- Gel
Industry
- E-Mobility Solutions
- Electronics - Circuits, Optoelectronics
- Industrial - Delicate components
Chemistry
- Solvent-Free
- Silicone
Application Method
- Dispenser - Automated dispensing equipment
Cure Method
- 2-Part Cure - Part A/Part B
Color
- Clear / Transparent - Transparent red
- Red - Transparent Red
Brand
- Dowsil
Also Known As
- Old Name - 3-6512 A & B Elastomer

Specifications

Cure Specs

Cure Temperature (°C)	20 to 25, 70
Cure Time (min)	120
Viscosity (cPs)	950
Work / Pot Time (min)	Very long, 1,440	Test Method
Mix Ratio	1:1 (by volume)

Material Resistance

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

Conductivity

Dielectric Strength (V/mil)	Excellent, 525
Volume Resistivity (O)	4.3E+14 (ohms/cm)

Hardness

Elastomeric	Soft Elastomer
Shore OO Hardness	43
Flexibility	Flexible, Resilient

Other Properties

Light Refractive Index (RI)	High
Specific Gravity	0.970	Test Method

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 3-6512 Elastomer

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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.
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.
  
  This is especially important with higher viscosity and faster-curing gels. 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.
Comparable Materials for Dow Dowsil 3-6512 Elastomer

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Spec Engine^® Results
- Dowsil 3-4150 Dielectric Gel(Dow)
  A two-part, transparent green, 1:1 mix ratio, fast RT cure gel
- 3-4155 HV Dielectric Gel Kit(Dow)
  Extremely soft to medium hardness, thermal/mechanical shock and vibration damping, excellent dielectric properties, flexible cure schedule, reversion resistant, thick section cure, compatible with automated dispensing equipment, and physical and electrical stability over a wider temperature range than the other types of gels.
- Fluorogel Q3-6679 Dielectric Gel(Dow)
  A two-part, clear, solvent resistant gel, room temperature or heat cure, long working time, resistant to fuels.
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