Item Name: SYLGARD™ 186 Silicone Elastomer
Manufacturer: The Dow Chemical Company
Technologies: Two-part, 10:1 mix, translucent silicone elastomer with room-temperature and heat cure
Color: Translucent
Cure Type: Room-temperature or heat cure
Package Size: 0.5, 5, 25, 225 kg (nominal)
Shelf Life: 12 months
SYLGARD™ 186 Silicone Elastomer is a two-part, 10:1 mix, translucent encapsulant designed for electrical and PCB assembly protection. It offers high tear strength, versatile room temperature and heat curing, and UL compliance. The elastomer cures without exotherm at a consistent rate, requires no post cure, and allows immediate use after curing. Its high viscosity and controlled cure process enable precise handling and reliable encapsulation for delicate components.
General potting applications
Power supplies, transformers, and amplifiers
Connectors, sensors, relays, and high-voltage resistor packs
Adhesive/encapsulant for solar cells and beam-lead integrated circuits
Application Methods: Automated metered mixing and dispensing, manual mixing
Surface Preparation: Clean surfaces thoroughly; priming may be required for adhesion
Processing/Curing: Room temperature or heat cure; minimize air entrapment, vacuum recommended
Useful Temperature Range: Operational from -45 to 200°C (-49 to 392°F) long-term
Repairability: Can be mechanically removed for repairs, then repotted for re-use
Before Mixing (Part A/Base)
| Property | Unit | Result |
|---|---|---|
| Viscosity | cP / mPa·s / Pa·s | 123800 / 123800 / 123.8 |
After Mixing (10:1)
| Property | Unit | Result |
|---|---|---|
| Viscosity | cP / mPa·s / Pa·s | 66700 / 66700 / 66.7 |
| Working Time at 25°C | hr | 1.65 |
| Heat Cure Time @ 100°C | min | 25 |
| Heat Cure Time @ 125°C | min | 15 |
| Heat Cure Time @ 150°C | min | 15 |
| Specific Gravity (Cured) | — | 1.12 |
| Tensile Strength | psi / MPa / kg/cm² | 305 / 2.1 / 21 |
| Elongation | % | 255 |
| Tear Strength (Die B) | ppi / N/cm | 100 / 70 |
| Durometer | Shore A | 24 |
| Dielectric Constant @ 100 Hz | — | 2.70 |
| Dielectric Constant @ 100 kHz | — | 2.68 |
| Volume Resistivity | ohm·cm | 4.98E+15 |
| Dissipation Factor @ 100 Hz | — | 0.00002 |
| Dissipation Factor @ 100 kHz | — | 0.00006 |
| Agency Listing | — | UL 94V-1 |
| Hardening Transition by DSC | °C / °F | -55 / -67 |
| Shelf Life at 25°C | months | 12 |
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