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.
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.
