Low Outgassing Materials

Momentive has formulated specialty RTV grades to reduce outgassing substantially when used under extreme conditions, e.g., high temperature and vacuum. General purpose silicones can outgas under these types of conditions.

 

Silicone RTVs for Low Outgassing Applications

RTV 566 sealant and RTV 567 sealant silicone rubber compounds can be excellent choices for aviation/aerospace applications requiring low outgassing. Both of these products pass ASTM E595, the Standard Test Method for measuring outgassing in adhesives and other materials. NASA developed ASTM E595 to screen low outgassing materials to be used in space. The test determines the volatile content of material samples placed in a heated vacuum chamber. If a material passes NASA low outgassing tests, TML must be less than 1% and the CVCM must be less than 0.1%. It can then be used in a multitude of applications including outer space, specialty optical, high vacuum and electro-optical applications.

 

RTV142 sealant is a one-component, ready-to-use adhesive sealant which cures to a tough, durable, resilient silicone rubber on exposure to atmospheric moisture at room temperature. Methyl alcohol vapors are released from the sealant surface as a by-product of cure. These vapors have low odor and are non-corrosive to most metals. An important property of RTV142 sealant is its low outgassing. RTV142 sealant has a thixotropic paste consistency. This allows it to be applied to vertical and overhead surfaces without sagging. Since it utilizes a moisture cure system, RTV142 sealant should not be used in thicknesses of greater than 6mm (¼ inch). When section depths exceed 6mm (¼ inch), Momentive Performance Materials one-component, addition cure or two-component silicone rubber compounds are suggested. This product also passes ASTM E595, the Standard Test Method for measuring outgassing in adhesives and other materials.

 

View Silicone RTVs in Aerospace and Aviation Brochure   View All Low Outgassing Materials Products

 

  One-Component                 
Potential Products (1)  
RTV 142
Features
Low volatile adhesive.
Substrate Adhesion  
Primerless adhesion to many substrates.

 

  Two-Component                 
Potential Products (1)  
RTV 560
RTV 566 (low volatile) 
RTV 567 (low volatile)  
Features
Extreme temperature performance potting compound/encapsulants. 
Low temperature potting compounds/encapsulants. 
Substrate Adhesion  
May require a primer for bonding applications. 
May require a primer for bonding applications. 

 

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*The marks followed by an asterisk (*) are trademarks of Momentive Performance Materials Inc.