RTV12 is a 2-part potting/encapsulating compound made by Momentive. We are pleased to report that RTV12 has just been given UL 94HB approval.   
 
More about RTV12
RTV12 is a clear two-component, low viscosity potting compound / encapsulant that cures at room temperature to a soft pliable rubber. RTV12 will cure in deep sections without additional heating or moisture. RTV12 adheres without need of a primer to most materials, including metals, plastics and ceramics typical of those found in electronic assemblies.  
  
The excellent electrical properties make it an ideal material for both high and low voltage electrical assemblies. The soft, rubbery property of RTV12, cushions against mechanical shock and vibration. RTV12 is clear enough to allow visual observation of components during pouring and after cure, the clarity lends to easy identification, repair and replacement of components.

Uniquely, Techsil can provide a clear or a blue catalyst for this material. The datasheet for RTV12 is  available to view on our website at www.techsil.co.uk (Login and search for RTV12 in the product search on the left hand menu)