Product Introduction
Momentive SILTRUST™ RTV681-LV is a highly reflective, durable silicone thermal control coating developed for long-term performance in harsh aerospace and environmental conditions. This two-part silicone system cures quickly, offers excellent adhesion to metals, composites, and organic substrates, and maintains flexibility even at extremely low temperatures. RTV681-LV can be applied as a semi-flowable paste or diluted for spray coating, providing broad processing versatility. Each batch meets ASTM E595 low-outgassing standards, making it suitable for satellite and space applications.
Momentive SILTRUST™ RTV681-LV Features
- Highly reflective thermal control coating with solar absorption as low as 0.13–0.16 depending on thickness
- Thermal emittance greater than 0.88 for efficient heat dissipation
- 100% solids formulation; can be diluted with optional Part C for spray or roller applications
- Convenient 1:1 by-weight mix ratio
- Long work time at 21°C (70°F) and 50% RH
- Fast full cure in 1 hour at 100–150°C, with optional room-temperature cure
- Meets ASTM E595 low-outgassing requirements
- Flexible coating capable of 3.2 mm (0.125 in) bend radius at –60°C
- Excellent dielectric insulation properties
- Non-specular coating for precision optical and thermal applications
- High resistance to UV, radiation, and atomic oxygen exposure
Momentive SILTRUST™ RTV681-LV Applications
- Satellite structures requiring passive thermal control coatings
- Aerospace and aviation components exposed to extreme environments
- Sensors and instrumentation requiring reflective thermal management
- Metal, composite, and polymer surfaces needing durable thermal insulation
- Coating of surfaces where low outgassing is essential
- High-reliability environments such as orbiting spacecraft and scientific platforms
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 |
|---|---|
| Product | SILTRUST™ RTV681-LV Thermal Control Coating |
| Uncured consistency (A component) | Semi-flowable |
| Uncured consistency (B component) | Semi-flowable |
| Color (A component) | White |
| Color (B component) | White |
| Viscosity#, cPs (A component) | 100,200 |
| Viscosity#, cPs (B component) | 90,650 |
| Specific gravity (A component) | 1.44 |
| Specific gravity (B component) | 1.45 |
| Diluted consistency (A component, 63% solids) | Flowable |
| Diluted consistency (B component, 63% solids) | Flowable |
| Diluted viscosity#, cPs (A component) | 5,700 |
| Diluted viscosity#, cPs (B component) | 5,700 |
| Diluted specific gravity (A component) | 1.08 |
| Diluted specific gravity (B component) | 1.09 |
| Mix ratio by weight | 1:1 (A:B) |
| Work time, hours (undiluted) | > 12 |
| Work time, hours (diluted) | > 8 |
| Hardness, Shore A (cured 1 h @ 100°C) | 52 |
| Tensile strength, MPa (psi) (1 h @ 100°C) | 4.6 (667) |
| Elongation, % (1 h @ 100°C) | 162 |
| Lap shear strengthǂ, MPa (psi) | 3.3 (489) |
| AM0 solar absorptance (0.075″ thick) | 0.13 |
| Thermal emittance (0.075″ thick) | 0.89 |
| Outgassing TML, % (1 h @ 100°C) | 0.27 |
| Outgassing CVCM, % (1 h @ 100°C) | 0.01 |
| Hardness, Shore A (0.5 h @ 60°C + 0.5 h @ 100°C) | 46 |
| Tensile strength, MPa (psi) (0.5 h @ 60°C + 0.5 h @ 100°C) | 3.7 (534) |
| Elongation, % (0.5 h @ 60°C + 0.5 h @ 100°C) | 145 |
| AM0 solar absorptance (0.006″ thick) | 0.16 |
| Thermal emittance (0.006″ thick) | 0.89 |
| Outgassing TML, % (0.5 h @ 60°C + 0.5 h @ 100°C) | 0.33 |
| Outgassing CVCM, % (0.5 h @ 60°C + 0.5 h @ 100°C) | 0.02 |
| Minimum bend radius capability | 3.2 mm (0.125″) at -60°C |
| Typical cure condition | 1 hour at 100°C or 1 hour at 150°C; also cures at room temperature |
| Low outgassing standard | Meets ASTM E595 |
