伟星新材：洪义华辞任副总经理

Core Points - The company announced on July 31 that it received a written resignation letter from Vice President Hong Yihua due to reaching retirement age [1] - The resignation will take effect from the date it is delivered to the company's board of directors [1] - After retirement, Hong Yihua will no longer hold any positions in the company or its subsidiaries [1]