Product Introduction
INVISISIL™ RTV615, RTV655, and RTV656 are two-component silicone rubber compounds that cure at room temperature into high-strength elastomers when mixed with their matched curing agents at a 10:1 ratio. Their low viscosity ensures excellent flow into complex assemblies, providing superior electrical insulation and environmental protection. RTV655 and RTV656 maintain exceptional flexibility down to -115°C, making them suitable for extreme low-temperature applications. Their clarity also supports uses requiring visual inspection or light transmission.
INVISISIL™ RTV615 / RTV655 / RTV656 Features
- Convenient 10:1 mixing ratio
- Low viscosity for excellent flow around components
- Heat-accelerated cure capabilities
- Deep-section curing without exotherm
- Low shrinkage formulation
- Solvent-free composition
- High hydrolytic stability and reversion resistance
- Excellent clarity for inspection or optical applications
- Retention of elastomeric properties up to 204°C
- RTV655 & RTV656 maintain flexibility down to -115°C
- Strong electrical insulation properties
INVISISIL™ RTV615 / RTV655 / RTV656 Applications
- Potting and encapsulation of sensitive electronics
- Shock, vibration, and moisture protection
- High-humidity and elevated-temperature environments
- Solar cell potting requiring maximum light transmission
- Encapsulation requiring optical clarity for inspection
- Low-temperature sealing (RTV655 and RTV656)
About Prostech
Prostech offers specialty materials (adhesives, tapes, thermal interface materials, insulating materials, sealants, PCB protection materials, …) along with manufacturing solutions. We proudly serve a wide range of industries and are an authorized distributor for leading global manufacturers of industrial materials and equipment. Our product range is designed to deliver customized solutions that address each customer’s unique needs.
With years of experience and a successful project history, we are confident in our ability to provide comprehensive material solutions. These solutions effectively tackle the challenges manufacturers face. To explore our full product catalog, simply click here. Our dedicated team is ready to assist with:
- Provide quotation, sample, TDS/MSDS, and technical consultation
- Testing sample quality and verifying product compatibility in our laboratory
- Customizing material formulas for special applications
- Adapting product sizes, quantities, and packaging to meet specific needs
- Offering expert advice on suitable equipment and automation processes
- Delivering technical training and on-site support for optimal product use
Moreover, Prostech ensures the safe and accurate global delivery of all materials, including “dangerous goods”, in compliance with legal regulations. For personalized technical support or to receive a quotation, please contact us today.
| Property | Value |
|---|---|
| Mix Ratio (A:B) | 10:1 |
| Viscosity (RTV615) | 4000 cps |
| Viscosity (RTV655) | 5200 cps |
| Viscosity (RTV656) | 5000 cps |
| Work Time (25°C) | 4 hours |
| Hardness (Shore A) | 44–45 |
| Tensile Strength | 65 kg/cm² (920 psi) |
| Elongation | 100–120% |
| Shrinkage | 0.2% |
| Refractive Index (615) | 1.406 |
| Refractive Index (655/656) | 1.430 |
| Dielectric Strength | 19.7 kV/mm |
| Volume Resistivity | 1.2–1.8 × 10¹⁵ ohm-cm |
| Useful Temperature (RTV615) | -60 to +204°C |
| Useful Temperature (RTV655/656) | -115 to +204°C |
| Cure Time @ 25°C | 6–7 days |
| Cure Time @ 65°C | 4 hours |
| Cure Time @ 100°C | 1 hour |
| Cure Time @ 125°C | 45 minutes |
| Cure Time @ 150°C | 15 minutes |
