Posted to News on 5th May 2026, 11:00
NASA low outgassing, chemically resistant epoxy features high Tg
Master Bond EP64 is a two-component, vacuum-compatible epoxy system engineered for bonding, sealing, and coating applications. It features a high glass transition temperature (Tg) of 210-215degC and meets NASA low outgassing specifications per ASTM E595 testing.
This product is resistant to a variety of chemicals - including acids, bases, and many solvents - and serves as a dependable electrical insulator.
EP64 has a tensile strength of 3,000-5,000 psi and a tensile modulus ranging from 540,000-680,000 psi at room temperature. The system exhibits a Shore D hardness of 80-90. It is serviceable over a temperature range of -51degC to +232degC, making it suitable for aerospace and electronic applications requiring stable performance under vacuum conditions.
This system features a working life of 12-24 hours for a 100-gram batch at room temperature and has a moderate viscosity with good flow properties. The recommended cure schedule is 80-90degC for 4-6 hours, followed by a post cure at 120-130degC for 2-4 hours to reach its full performance profile. Achieving a Tg of 210-215degC with such a cure profile is the key distinguishing characteristic of this system. EP64 bonds to substrates including metals, plastics, rubbers, ceramics, and composites. It is available in standard packaging ranging from 1/2 pint to gallon kits, as well as in premixed and frozen syringes.
