I'm asking this question on behalf of a recent MRO / FAA repair facility that called me.

They're setting up a small peening machine with glass bead as the media. They've contacted a few distributors and was told that finding glass bead that meets AMS-2431/6 is difficult and other MRO facilities in the region use MIL-PRF-9954D glass bead as an acceptable substitute.

Does anyone have any knowledge/thoughts on this?
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Dave Barkley
EI SPT Director, Peening Preceptor & Product Engineer