| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a carrier core material for an electrophotographic developer, which can be stably used for a long period of time.SOLUTION: A carrier core material (11) contains manganese, iron and strontium as a core composition. The maximum height Rz of grains constituting the carrier core material (11) is 2.00μm or more and 3.50μm or less in average, and a root-mean-square inclination angle RΔq of the grains constituting the carrier core material (11) is 0.70 or more and 1.00 or less in average.</p> |
