Electronic Products & Technology

Silver conductive silicone adhesive meets NASA outgassing specs

October 7, 2020  Stephen Law

MASTER BOND MasterSil 151S is an addition curing two-part silicone system that may be used as an adhesive, sealant, coating or form-in-place gasketing material. Product’s silicone chemistry passes NASA low outgassing specifications, and it retains improved electrical conductivity with a volume resistivity of 0.004 ohm-cm at 75°F. Product is suitable for applications where low stress is required, since it is highly flexible across a wide service temperature range. It is capable of resisting aggressive thermal cycles and shocks. Product’s mix ratio is 100 to 5 by weight, and it cures with the addition of heat. Upon mixing, it retains its smooth, paste consistency, and has a long working life of 6-12 hours for a 50 gram mass. This silicone product has an elongation between 100-150%, tensile strength of 400-700 psi and can cure beyond ¼ inch thick. It features a thermal conductivity of 1.30-1.59 W/(m•K), a coefficient of thermal expansion of 150-200 x 10-6 in/in/°C, and hardness of 80-90 Shore A. It is serviceable over the temperature range of -80°F to +400°F. 

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