Zheng Xing Xing Ye Ri Bao·2025-09-15 08:43Core Insights - The plastic sector experienced a 1.1% increase on September 15, with Hangzhou High-tech leading the gains [1] - The Shanghai Composite Index closed at 3860.5, down 0.26%, while the Shenzhen Component Index closed at 13005.77, up 0.63% [1] Plastic Sector Performance - Hangzhou High-tech (300478) saw a closing price of 25.25, with a significant increase of 14.36% and a trading volume of 244,700 shares [1] - Other notable performers included: - Upwind New Materials (688585) at 97.02, up 10.50% with a trading volume of 134,300 shares [1] - Tianyang New Materials (603330) at 8.24, up 10.01% with a trading volume of 452,100 shares [1] - Dongcai Technology (601208) at 21.48, up 4.68% with a trading volume of 1,959,000 shares [1] - Jinfat Technology (600143) at 19.85, up 3.71% with a trading volume of 3,082,800 shares [1] Capital Flow Analysis - The plastic sector experienced a net outflow of 344 million yuan from institutional investors, while retail investors saw a net inflow of 107 million yuan [2] - The main capital inflow and outflow for selected stocks included: - Dongcai Technology (601208) with a net inflow of 33.8 million yuan from main investors [3] - Upwind New Materials (688585) with a net outflow of 16.3 million yuan from main investors [3] - Tianyang New Materials (603330) with a net inflow of 49.4 million yuan from main investors [3]