西部材料：控股子公司拟筹划重大资产重组事项，9月22日起停牌

Group 1 - The core point of the article is that Western Materials announced a significant asset restructuring plan for its subsidiary, Xi'an Filter Metal Filter Materials Co., Ltd. (referred to as "Filter") [1] - To ensure fair information disclosure and protect investor interests, Filter has applied for a stock suspension starting from September 22, 2025, with an expected resumption by October 21, 2025 [1] - The asset restructuring is still in the planning stage, and its implementation remains uncertain [1]