Understanding low outgassing
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^MASTER BOND TECH SPOTLIGHT Outgassing Adhesives Applications that need to meet stringent outgassing requirements now have more adhesive options than ever Master Bond Inc. 154 Hobart Street, Hackensack, NJ 07601 USA

TECH SPOTLIGHT Understanding Low Outgassing Adhesives Applications that need to meet stringent outgassing requirements now have more adhesive options than ever. One of the most common issues addressed by our technical service department nowadays involves the outgassing characteristics of adhesives and related encapsulation and sealing compounds. And that’s understandable because a growing number of high-tech industries have discovered that their products and manufacturing processes can be sensitive to outgassed chemical compounds. As a result, there has been a dramatic upswing in the use of...

Measuring Outgassing The industry standard test for measuring outgassing in adhesives and other materials is ASTM E595. Developed by NASA to screen low-outgassing materials for use in space, the test determines the volatile content of material samples placed in a heated vacuum chamber. Samples to be tested are first preconditioned at 50 percent relative humidity for 24 hours and weighed. They then go into the test chamber for another 24 hours with the temperature set at 125 C and the vacuum at a minimum of 5 x 10-5 torr. During that time in the test chamber, volatiles that outgas from the...

Typical Low-Outgassing Applications • • • • • • • • • • • • • • • • Disk drive assemblies Voice coil motors MEMs devices High-vacuum applications Solar arrays and panels Fiber optic assemblies LEDs Optical telescopes Reflectors Respirators Space systems Spectrometers Optics used in aircraft and space applications Lens mounts and prisms Wavelength-division multiplexing (WDM) applications Avalanche photodiodes (APDs) • edical filter M applications • igh-power voltage H supplies • ptoelectronic O assemblies • Piezo devices • Clean room applications • Satellite assemblies • lectronics underfill...

Table 1. Popular Low Outgassing Adhesives Master Bond offers a wide variety of certified low-outgassing adhesives. Some of the most popular grades are described here: EP29LPSP Low viscosity, cryogenically serviceable epoxy with excellent physical properties for bonding or potting. Withstands cryogenic shocks. Superior electrical insulation properties. Optically clear. EP21TCHT-1 Thermally conductive, two-component epoxy with paste consistency. Cryogenically serviceable. High temperature resistant for bonding and sealing. Cures at room temperature. Service temperature range 4K to 400°F....