中密控股：公司的机械密封板块业务主要分为增量业务和存量业务两部分

Group 1 - The core viewpoint of the article is that Zhongmi Holdings has clarified the structure of its mechanical seal business, which is divided into incremental and stock business segments [2] - The incremental business in the petrochemical sector is closely related to new investments and construction in the petrochemical industry [2] - The stock business focuses on the maintenance and replacement of products in existing projects, which is less affected by new investment and construction activities [2] Group 2 - The company suggests that for a comprehensive understanding of the overall trend in the petrochemical industry by 2026, investors should refer to industry research reports [2]