WACKER® RTV-S 691 A/B is a self levelling, two-part addition curing silicone rubber which can be vulcanised at room temperature. Due to its low outgassing rate and low temperature flexibility it is recommended especially for space applications.

It has been designed and is used as adhesive for solar cells on solar generators for space applications such as satellites.


  • resistant to low temperatures
  • glass transition temperature: < -100 °C / -148 °F
  • particularly low volatile contents
  • admitted for aerospace applications by ESTEC (European Space Research and technology Centre) according to specification ECSS-Q-70-02A (corresponds to former ESA PSS-01-701)

Spezifische Merkmale von WACKER® RTV-S 691 A/B

  • hitzebeständig
  • niedriger Flüchtigengehalt
  • tieftemperaturflexibel
  • UV-stabil


The 'Best use before end' date of each batch is shown on the product label. Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.

Vertrieb & Support

Wacker Chemie AG
Heilbronner Strasse 74
70191 Stuttgart
+49  711  61942-0 (Phone)
+49 711 61942-61  (Fax)

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