I would suggest ypu call Superior Flux & Mfg. Co and talk to Dr. Baskins who has a lot of experience in the flux area. Phone 440-349-3000.
I have had no experience with this element in fluxes but it would be another active getter and may have some merit in a specific application but I would have no idea where.
Are you suggesting the use of cesium or is there a manufacturer who is promoting such a flux??
Bob Peaslee
248-585 6400 x 240