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Silicone passes NASA outgassing requirements.

Master Bond is offering a two-component, silver-filled silicone with superb electrical and thermal conductivity that passes NASA's low outgassing testing requirements. It is an addition cured system and does not require air for curing. Unlike many other types of silicones, it can cure in wide cross-sections, as well as in-depth (>1 inch). The mix ratio is 100 to 5 by weight, and after mixing it has a paste viscosity. The curing schedule is 25-45 minutes at 250-300[degrees]F or hours at 160-200[degrees]F.

After curing, MasterSil 973S-LO is said to be an outstanding electrical conductor. Its exceptionally low volume resistivity allows it to be used for many different applications involving bonding, sealing and coating. It bonds well to a wide variety of substrates, including metals, ceramics, glass and composites, as well as many types of rubber and plastics.

The system has very good flexibility and elongation. It can withstand aggressive thermal cycling, as well as thermal and mechanical shock. It is a paste-like system with minimal flow. Its consistency also allows it to be utilized as a form-in-place conductive gasketing material. The system is 100% solids and its color is silver. The service temperature range is -120[degrees]F to +400[degrees]F.

MasterSil 973S-LO is said to serve up a notable array of product properties. Most conspicuous are its low outgassing properties, excellent electrical conductivity and, being a silicone, great flexibility and temperature resistance, according to the company. It is used in aerospace, electronic, optoelectronic and specialty OEM applications where this combination of properties is needed and desirable.

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Title Annotation:Silicone & Medical Update
Publication:Rubber World
Date:Mar 1, 2017
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