Low Stress, Optically Clear, One Part Silicone Meets NASA Low Outgassing Specifications

March 24, 2015

Passing ASTM E595 testing for NASA low outgassing, Master  Bond MasterSil 920-LO is a high performance, room temperature vulcanizing  silicone for sealing, coating and small encapsulations. This single component  system has a moderate, flowable viscosity and a solid electrical profile, which  makes it well suited for conformal coating applications in the electronic and  optical industries. Featuring a soft durometer of 25-35 Shore A, this low  stress silicone can protect sensitive electronic components.

As a one part system, MasterSil 920-LO offers  convenient handling with no mixing and has a neutral non-corrosive cure. Similar  to other one component silicones, the curing mechanism is based on humidity,  where the higher it is, the faster the cure. Its tack free time ranges from  45-60 minutes. MasterSil 920-LO bonds very well to a wide variety of substrates  including metals, glass as well as many plastics and rubber materials. With its  inherent flexibility, the compound can withstand rigorous thermal cycling and  shock. It is also optically clear and has a refractive index of 1.43

It is serviceable over the wide temperature range of  -175°F to +500°F and has a six month shelf life in its original, unopened  packaging at room temperature. MasterSil 920-LO is available in syringes, 100  gram bottles, 200 gram bottles and pint containers.

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