TAGS: Sealants Epoxy Adhesives
Master Bond has launched NASA approved Supreme 121AO, which is a low outgassing epoxy system suitable for bonding, sealing and potting applications. The epoxy system has a high glass transition temperature of 200-210°C, Supreme 121AO resists temperatures up to 550°F.
This system exhibits an element of toughness and is not as stiff as conventional epoxies that withstand extreme temperatures.
Application and Properties of Supreme 121AO Epoxy System
Supreme 121AO has tensile modulus of 750,000 to 850,000 psi at room temperature and a compressive strength of 26,000 to 28,000 psi. The system’s thermal conductivity is 4-5 BTU•in/(ft2•hr•°F) and is electrically non-conductive.
The shrinkage upon cure is exceptionally low. This system withstands thermal cycling, mechanical stresses and resists many chemicals, including, water, oils, fuels, acids and bases. Supreme 121AO may be used in aerospace, electronics, opto-electronic and OEM applications.
Working Life of Epoxy System
This two-part epoxy has a mix ratio of 100 to 80 by weight. The viscosity of the mixed compound is 10,000-25,000 cps making it readily pourable for potting and casting. The system has long working life after mixing of two to three days, for 100 g batch. The recommended cure schedule is 1-2 hours at 200°F followed by three to four hours at 250°F then 4-6 hours at 300°F. Additional post curing at 350°F for 2-4 hours will enhance product properties.
Source: Master Bond