Jiangyin Chengli Bulk Chemical Co., Ltd. VOC Online Testing Annual Operation and Maintenance Change Announcement Change Announcement Number: WXBGGG202504240001 The VOC Online Testing Annual Operation and Maintenance Announcement (Project Number: WXCGXY202504150001) issued by our company on April 15, 2025, has been changed as follows: the deadline for quotation before and after the type change is 08:00:00 on April 24, 2025, and 08:00:00 on April 25, 2025. Except for the above changes, the rest of the original announcement is still valid. Jiangyin Chengli Bulk Chemical Co., Ltd. April 24, 2025