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Master Bond’s New Silicone System Meets NASA Low Outgassing Specifications

Published on 2020-11-17. Author : SpecialChem

TAGS:  Sealants    

Master Bond’s New NASA-approved Silicone Adhesive for Bonding ApplicationMaster Bond launches MasterSil 151S, a two-part addition curing silicone system that can be used as an adhesive, sealant, coating or form-in-place gasketing material. A unique feature of the adhesive is that despite its silicone chemistry, it passes NASA low outgassing specifications.

Flexible Adhesive with Long Working Life


MasterSil 151S 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,” said 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, the adhesive retains its smooth, paste consistency, and has a long working life of 6-12 hours for a 50 gram mass. The silicone product has an elongation between 100-150 percent, tensile strength of 400-700 psi and can cure beyond quater inch thick.

Bonds to Variety of Substrates


MasterSil 151S 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. The adhesive is serviceable over the temperature range of -80°F to +400°F.

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


Source: Master Bond
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