Silver conductive silicone adhesive meets NASA specifications 11 November 2020

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. A unique feature of this product is that despite its silicone chemistry, it passes NASA low outgassing specifications.

Also, it retains superior electrical conductivity with a volume resistivity of 0.004 ohm-cm at 75°F. “This silicone is ideal 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,” says Rohit Ramnath, senior product engineer.

The mix ratio of MasterSil 151S 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 50g mass. This silicone product has an elongation between 100-150%, tensile strength of 400psi - 700psi 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.

This compound bonds well to a variety of substrates including metals, ceramics, composites and many plastics and rubbers. It is available for use in 20g, 50g and 100g glass jars. The colour of Part A is silver and Part B is clear. MasterSil 151S has a low linear shrinkage upon curing and is RoHS compliant.

Claire Aldridge Deputy Editor t: +44 (0) 1727 743 889

Having spent a decade in the fastener industry experiencing every facet – from steel mills, fastener manufacturers, wholesalers, distributors, as well as machinery builders and plating + coating companies, Claire has developed an in-depth knowledge of all things fasteners.

Alongside visiting numerous companies, exhibitions and conferences around the world, Claire has also interviewed high profile figures – focusing on key topics impacting the sector and making sure readers stay up to date with the latest developments within the industry.