非金属材料板块9月16日跌0.56%，宁新新材领跌，主力资金净流出1.17亿元

Group 1 - The non-metal materials sector experienced a decline of 0.56% on September 16, with Ningxin New Materials leading the drop [1] - The Shanghai Composite Index closed at 3861.87, up 0.04%, while the Shenzhen Component Index closed at 13063.97, up 0.45% [1] - Key stocks in the non-metal materials sector showed mixed performance, with notable declines in several companies [1][2] Group 2 - Ningxin New Materials saw a significant drop of 3.46%, closing at 17.30, with a trading volume of 86,600 shares and a turnover of 150 million yuan [2] - The sector experienced a net outflow of 117 million yuan from main funds, while retail investors contributed a net inflow of 96.95 million yuan [2]