MasterSil 981-LO is a two-component, addition-cured silicone designed for bonding, sealing, coating and encapsulating applications requiring optical clarity and flexibility. The system meets NASA low-outgassing specifications and is suited for aerospace, satellite, optical and optoelectronic applications. The silicone features a Shore A hardness of 20-30, elongation of 200-300%, and operating temperatures from -65°F to +400°F. It provides electrical insulation properties, including dielectric strength of 450V/mil and volume resistivity greater than 10¹⁴ ohm-cm. The material bonds to metals, glass, plastics, ceramics and many silicone rubbers, and offers a 1:1 mix ratio with a 3-4 hour working life for simplified processing and dispensing.

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