Master Bond Supreme 121AOND from Master Bond, Inc.

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Supreme 121AOND Product Information
Two part toughened epoxy for bonding, sealing and encapsulation features good thermal conductivity

Key Features

Paste consistency
High temperature resistance
Exceptionally long open time
Passes NASA low outgassing

Master Bond Supreme 121AOND is a thermally conductive epoxy for bonding, sealing and encapsulation. The mix ratio is 100:80 by weight. This system has a very long open time of 2-3 days and after mixing, it is a paste. Supreme 121AOND requires oven curing. A typical cure schedule would be 1-2 hours at 200-210°F followed by 3-4 hours at 250°F and then 4-6 hours at 300°F. Additional post curing at 350°F for 2-4 hours will further enhance product properties. Supreme 121AOND combines a high glass transition temperature along with an element of toughness, making it less rigid than typical higher temperature resistant epoxies.

Supreme 121AOND bonds to a wide variety of substrates including metals, composites, glass, and many rubbers and plastics. It adheres especially well to glass, fibers and ceramics. This system can withstand thermal cycling and mechanical stresses. Its physical strength profile is strong and steadfast, particularly its tensile modulus. It is a reliable thermal conductor while retaining excellent insulation properties. Supreme 121AOND has good resistance to chemicals including water, oils, fuels, acids and bases. The color of Part A is black and Part B is dark brown. Its service temperature range is -80°F to +550°F. It should be noted that Supreme 121AOND is particularly well suited for bonding and sealing applications. It should be considered in demanding aerospace, electronic, opto-electronic and specialty OEM type applications where this product profile is needed.

Product Advantages

Paste consistency with a long working life
Thermally conductive, electrically insulative
Superior physical strength properties
High glass transition temperature
Has an element of toughness
Combines exceptionally low shrinkage and high dimensional stability

About Master Bond
Master Bond Inc. was founded in 1975. Our focus has been on developing the best in epoxies, silicones, polyurethanes, polysulfides, UV cures and other specialty adhesive systems. We are true specialists in our field and are recognized by many as the preeminent adhesive formulation company in the world.

Through research and development, we have been able to create innovative, new compounds with truly unique properties. This effort has been led by our Technical Director, Dr. Walter Brenner. Dr. Brenner received his Ph.D. in Polymer Chemistry from Brooklyn Polytechnical Institute. He is a renowned Professor of Chemical Engineering and has served as a consultant for various U.S. Government agencies. He holds numerous patents and is credited with being the first person to develop electron beam radiation curing.

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