Mgo Vapor Deposition Material

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A MgO vapor deposition material, which is used to form a protective film of a plasma display panel, comprises pellets having MgO purity of 98% or more and relative density of 90% or more. The pellets contain only a Sc element as a rare earth element. The concentration of the Sc element is from 5 to 5, 000 ppm, preferably from 10 to 3, 000 ppm, and more preferably from 20 to 2, 000 ppm.