MasterSil 323AO-LO two-component silicone elastomer has self-priming feature. Is designed for bonding, sealing and gap filling.

Electrically insulating and thermally conductive compound meets NASA low outgassing specifications and can be used in aerospace, electronics, optoelectronic and specialty OEM applications. Thermal conductivity is 1.15-1.30 W/(m•K). Is flexible, with a tensile modulus of 500-700psi, elongation of 50-60%, and hardness of 70-75 Shore A. Is said to withstand aggressive thermal cycling and mechanical shock. Relatively high strength profile for a silicone, with a tensile lap shear strength of 250-350psi at room temperature. Bonds to a variety of substrates, including metals, composites, glass, ceramics, plastics, and other silicones without imparting residual stress when heat-cured. Serviceability is from -65° to +400°F (-54° to +204°C). Paste-like consistency permits use as a gap-filling material where minimum flow after application is desired. Optimum cure is overnight at room temperature followed by 3-5 hours at 125°-175°F.

Master Bond

https://www.masterbond.com/products/two-part-silicone-adhesives-sealants-and-coatings