Item Name: RTV615 / RTV655 / RTV656
Manufacturer: Momentive Performance Materials
Technologies: Two-component, clear liquid silicone rubber compounds (10:1 mix ratio)
Color: Clear, Colorless
Cure Type: Room temperature cure (accelerated by heat)
Package Size: Contact to Techniq VN for details.
Shelf Life: Contact to Techniq VN for details.
RTV615, RTV655, and RTV656 are two-component, clear liquid silicone rubber compounds that cure at room temperature to form high-strength silicone elastomers. Supplied in matched 10:1 kits by weight, they differ in low-temperature flexibility, with RTV655 and RTV656 remaining flexible down to -115°C (-175°F). These low-viscosity compounds are easily pourable and suitable for potting, encapsulation, and protection of electronic components and assemblies against shock, vibration, moisture, ozone, dust, and chemicals. Their optical clarity allows visual inspection, making them ideal for applications such as solar cell potting or electronics where component identification is important.
Potting and encapsulation of electronic components and assemblies
Protection against shock, vibration, moisture, ozone, dust, and chemicals
High-clarity applications requiring visual inspection
Low-temperature applications (RTV655 and RTV656) down to -115°C (-175°F)
Industrial and electronic environments where high humidity and elevated temperatures are present
| Property | RTV615 | RTV655 | RTV656 |
|---|---|---|---|
| Uncured Properties (with curing agent) | |||
| Color | Clear, colorless | Clear, colorless | Clear, colorless |
| Consistency | Easily pourable | Easily pourable | Easily pourable |
| Viscosity, cps | 4000 | 5200 | 5000 |
| Work Time @ 25°C, hrs | 4 | 4 | 4 |
| Cured Properties (1 hr @ 100°C) | |||
| Hardness, Shore A | 44 | 45 | 44 |
| Tensile Strength, kg/cm² (psi) | 65 (920) | 65 (920) | 65 (920) |
| Elongation, % | 120 | 120 | 100 |
| Shrinkage, % | 0.2 | 0.2 | 0.2 |
| Refractive Index | 1.406 | 1.430 | 1.430 |
| Dielectric Strength, kV/mm (v/mil) | 19.7 (500) | 19.7 (500) | 19.7 (500) |
| Dielectric Constant @ 1000 Hz | 2.7 | 2.69 | 2.69 |
| Dissipation Factor @ 1000 Hz | 0.0006 | 0.0004 | 0.0004 |
| Volume Resistivity, ohm·cm | 1.8×10¹⁵ | 1.2×10¹⁵ | 1.2×10¹⁵ |
| Useful Temperature Range, °C (°F) | -60 to 204 (-75 to 400) | -115 to 204 (-175 to 400) | -115 to 204 (-175 to 400) |
| Thermal Conductivity, gm·cal/sec·cm²·°C/cm (Btu/hr·ft²·°F/ft) | 0.00045 (0.11) | 0.00045 (0.11) | 0.00045 (0.11) |
| Coefficient of Expansion, cm/cm·°C (in/in·°F) | 27×10⁻⁵ (15.3×10⁻⁵) | 33×10⁻⁵ (18.3×10⁻⁵) | 33×10⁻⁵ (18.3×10⁻⁵) |
| Specific Heat, cal/g·°C (Btu/lb·°F) | 0.3 (0.3) | 0.3 (0.3) | 0.3 (0.3) |
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