Item Name: SYLGARD™ 184 Silicone Elastomer
Manufacturer: The Dow Chemical Company
Technologies: Polydimethylsiloxane elastomer, two-part 10:1 mix ratio
Color: Colorless
Cure Type: Room temperature and heat cure
Package Size: Contact to Techniq VN for details
Shelf Life: Contact to Techniq VN for details
SYLGARD™ 184 is a two-part, transparent silicone elastomer supplied in a 10:1 mix ratio. It offers good flame resistance, high transparency for easy inspection, and versatile curing options at room temperature or with heat. The material exhibits excellent dielectric properties, rapid cure control via temperature, and flexibility once cured, making it suitable for electrical and electronic encapsulation. The elastomer cures without exotherm, requires no post-cure, and may adhere effectively with or without primer depending on the application.
LED lighting encapsulation
Power supplies and transformers
Connectors and sensors
Industrial controls and relays
High voltage resistor packs
Amplifiers
Adhesive/encapsulant for solar cells
Handling beam lead integrated circuits during processing
| Property | Unit | Result |
|---|---|---|
| One or Two Part | – | Two |
| Color | – | Colorless |
| Viscosity (Base) | cP / Pa·s | 5100 / 5.1 |
| Property | Unit | Result |
|---|---|---|
| Viscosity (Mixed) | cP / Pa·s | 3500 / 3.5 |
| Thermal Conductivity | btu/hr·ft·°F / W/m·K | 0.15 / 0.27 |
| Specific Gravity (Cured) | – | 1.03 |
| Working Time at 25°C | hours | 1.5 |
| Cure Time at 25°C | hours | 48 |
| Heat Cure Time at 100°C | minutes | 35 |
| Heat Cure Time at 125°C | minutes | 20 |
| Heat Cure Time at 150°C | minutes | 10 |
| Durometer Shore A | – | 43 |
| Dielectric Strength | volts/mil / kV/mm | 500 / 19 |
| Volume Resistivity | ohm·cm | 2.9×10¹⁴ |
| Dissipation Factor at 100 Hz | – | 0.00257 |
| Dissipation Factor at 100 kHz | – | 0.00133 |
| Dielectric Constant at 100 Hz | – | 2.72 |
| Dielectric Constant at 100 kHz | – | 2.68 |
| Linear CTE (by DMA) | ppm/°C | 340 |
| Tensile Strength | PSI / MPa / Kg/cm² | 980 / 6.7 / 69 |
| Refractive Index @ 589 nm | – | 1.4118 |
| Refractive Index @ 632.8 nm | – | 1.4225 |
| Refractive Index @1321 nm | – | 1.4028 |
| Refractive Index @ 1554 nm | – | 1.3997 |
| UL RTI Rating | °C | 150 |
This keeps the Typical Properties section concise (~120 words) while clearly separating pre- and post-
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