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 Elastomeric Soft Elastomer Light Refractive Index (RI) High
Technical Data for Dow Dowsil 3-6512 Elastomer
1 Part or 2 Part
- 1 Part or 2 Part - 2 Part
- Dispenser - Automated dispensing equipment
- 2-Part Cure - Part A/Part B
- Clear / Transparent - Transparent red
- Red - Transparent Red
Also Known As
- Old Name - 3-6512 A & B Elastomer
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)
High Temperature Resistance (°C) 200 Low Temperature Resistance (°C) -45, -55 Moisture/Humidity Resistance Moisture/humidity resistance
Dielectric Strength (V/mil) Excellent, 525 Volume Resistivity (O) 4.3E+14 (ohms/cm)
Elastomeric Soft Elastomer Shore OO Hardness 43 Flexibility Flexible, Resilient
Light Refractive Index (RI) High Specific Gravity 0.970 Test Method
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
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.
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.
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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