Jiangyin Chenggao Packaging Materials Co., Ltd. Pipeline Buffer Batch Change Announcement Number: WXBGGG202505190003 The pipeline buffer batch announcement (project number: WXCGXY202504300001) issued by our company on May 6, 2025, has been changed as follows: the deadline for quotation before and after the type change is 08:13:13 on May 19, 2025, 08:00:46 on May 26, 2025, and the deadline for clarification before and after the bid is 07:23:24 on May 19, 2025, and 07:30:56 on May 26, 2025. Except for the above changes, the rest of the original announcement is still valid. Jiangyin Chenggao Packaging Materials Co., Ltd. May 19, 2025