化学纤维板块10月21日涨1.09%，蒙泰高新领涨，主力资金净流出1.2亿元

Group 1 - The chemical fiber sector increased by 1.09% on the trading day, with Montai High-tech leading the gains [1] - The Shanghai Composite Index closed at 3916.33, up 1.36%, while the Shenzhen Component Index closed at 13077.32, up 2.06% [1] - Key stocks in the chemical fiber sector showed various increases, with Montai High-tech rising by 4.44% to a closing price of 28.92 [1] Group 2 - The main capital flow in the chemical fiber sector showed a net outflow of 120 million yuan from institutional investors, while retail investors had a net inflow of 150 million yuan [1] - The trading volume and turnover for key stocks in the sector varied, with Hengda Hailong seeing a trading volume of 188,700 shares and a turnover of approximately 97.84 million yuan [1]