WACKER® RTV-S 691 A/B
- Chemical Family
- Silicones
WACKER® RTV-S 691 A/B is a self-leveling, two-part addition-curing silicone rubber that can be vulcanized at room temperature. It is particularly recommended for space applications due to its low outgassing rate and low temperature flexibility. This product has been specifically designed and used as an adhesive for solar cells on solar generators in space applications, including satellites.
Product families
Applications
- Aerospace & Aviation
Product Families
- Other Adhesives & Sealants
Other characteristics
- Brand
- WACKER
- Cure Method
- Chemical Cure
- Product Type
- 2K (2 component) Sealant
- Application Area
- Satellite, Solar Cell, Spacecraft
- Satellite
- Solar Cell
- Spacecraft
- Note
- Cured properties at 5°C in press
- Markets
- Automotive & Transportation
- Properties
- Resistant to low temperatures
- Particularly low volatile contents
- Cure
- Chemical Cure
- Technology
- Ready-to-Use Products
- Specific Features
- Heat resistant
- Low volatile
- Low-temperature flexible
- UV stable
- Application Details
Mixing ratio is 9:1 p.b.w Before taking component A out of the container or adding the catalyst, stir the material thoroughly. Components A and B can be mixed by hand or with metering equipment. The material must be evacuated before application to remove enclosed the bubbles. For detailed information refer to our leaflet "Wacker RTV-2 Silicone Rubber Processing". Important: The platinum catalyst is contained in component A. Caution! Only components A and B that have the same lot numer may be processed together!; WACKER® RTV-S 691 A/B is used as silicone adhesive with minimum outgassing behavior for space projects, example bonding for solar cells in satellites.; RTV-S691 can be applied by silk screen printing or by dispensing equipment. In order to make the rubber adhere to other materials (e. g. glass, aluminum, silver, epoxy resin, polyester resin), it is necessary to pretreat the surface with Primer G 790.
- Chemical Inventories
- AICS (Australia)
- DSL (Canada)
- ENCS (Japan)
- IECSC (China)
- PICCS (Phillipines)
- TCSI (Taiwan)
- TSCA (USA)
Technical data
Table 1 of 4
1 row| Characteristic | Value | Unit |
|---|---|---|
| Glass Transition Temperature | max. -100 | °C |
Table 2 of 4
3 rows| Characteristic | Value | Unit | Method |
|---|---|---|---|
| Dynamic Viscosity (Component B, at 23°C) | 18000.0 - 26000.0 | mPa·s | Brookfield |
| Mix Ratio (A:B) | 9:1 | parts by weight | — |
| Pot Life (up to 200,000 mPa.s, at 16s⁻¹) | 90 - 110 | minutes | Brookfield |
Table 3 of 4
10 rows| Characteristic | Value | Unit | Method |
|---|---|---|---|
| Collected Volatile Condensable Material (CVCM) | max. 0.1 | % | ESA ECSS-Q-70-02A |
| Density (in water, at 23°C) | 1.52 | g/cm³ | DIN EN ISO 1183-1 A |
| Elongation (at break) | 100 - 160 | % | ISO 37 |
| Modulus (at 100 % elongation, 23.0°C, 50.0 % r.h) | 1.33 - 1.53 | N/mm² | ISO 37 |
| Shore Hardness A | 50 - 60 | — | DIN ISO 48-4 |
| Surface Resistivity (at 100V) | min. (1.0 x 10¹²) | ohm | — |
| Tear Resistance | 4.0 - 6.0 | N/mm | ASTM D 624 B |
| Tensile Strength (Type 3) | 4.0 - 6.0 | N/mm² | ISO 37 |
| Total Mass Loss (TML) | max. 1.0 | % | ESA ECSS-Q-70-02A |
| Volume Resistivity (at 100V, 1 min) | min. 1.0 x 10¹⁴ | Ohm-cm | IEC 62631-3-1 |
Table 4 of 4
4 rows| Characteristic | Value | Unit | Method |
|---|---|---|---|
| Density (Componenet A) | 1.55 - 1.65 | g/cm³ | DIN EN ISO 2811-1 |
| Density (Componenet B) | 0.98 | g/cm³ | DIN EN ISO 2811-1 |
| Dynamic Viscosity (Component A, at 23°C, Spindle 5, 2.5 rpm) | 55000.0 - 70000.0 | mPa·s | Brookfield |
| Viscosity (at 25°C, Component B) | 200 - 240 | — | ISO 3219 |
