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June 19, 2017
By: Catherine Diamon
Chrome-free aerospace sealants by PPG have received NATO Stock Numbers (NSN) by the U.K. Ministry of Defence as a standardized supply material that simplifies ordering. Military personnel can now order PR-1425CF chrome-free polysulfide windshield and canopy sealant and PR-2870 non-chrome corrosion-inhibitive (NCCI) sealant by NSN (National Stock Numbers in the U.S.) without issuing new purchasing requests. According to David Best, PPG aerospace sales manager based in Shildon, England, having NSN status helps ensure continuity of supplies during the industry transition to chrome-free products. “PR-1425CF windshield and canopy sealant and PR-2870 NCCI sealant have advantages over their predecessors in addition to their chrome-free formulations,” Best said. “Armed forces in the NATO countries as well as many others that use NSN listing are able to substitute older technology for newer, cleaner and more advanced materials.” Designed for use on glass, polycarbonate and acrylic windows, PR-1425CF sealant is formulated not to cause window surfaces to craze and cures in less than half the time of predecessor PR-1425 sealant. PPG uses PR-1425CF sealant on cockpit windows and canopies it produces. Fast-curing PR-2870 sealant is used for aerodynamic smoothing, structural surface sealing, fay sealing and pressure fuselage sealing applications. Designed as a replacement option for PRO-SEAL™ 870 sealant, PR-2870 sealant uses PPG-patented technologies and is qualified to U.S. Military Specification MIL-PRF-81733. It is the result of PPG’s collaboration to develop a chrome-free, high-performance corrosion-inhibitive sealant for a project sponsored by the Strategic Environmental Research and Development Program (SERDP). Both PPG sealants are NSN listed in Class B for most-common extrusion and spatula applications, Best said. PR-1425CF Class B2 sealant is NSN 8030 99 7514921 and PR-1425CF Class B1/2 is NSN 8030 99 2939307. PR-2870 Class B2 sealant is NSN 8030 99 3788119 and PR-2870 Class B1/2 is NSN 8030 99 1553404. The Class B2 sealants have a two-hour application life and cure in 12 hours, while the Class B1/2 sealants have a half-hour application life and cure in six hours.
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