化学原料板块12月19日涨1.73%，世龙实业领涨，主力资金净流入4.81亿元

Group 1 - The chemical raw materials sector increased by 1.73% compared to the previous trading day, with Shilong Industrial leading the gains [1] - The Shanghai Composite Index closed at 3890.45, up 0.36%, while the Shenzhen Component Index closed at 13140.22, up 0.66% [1] - Detailed stock performance within the chemical raw materials sector is provided in a table [1] Group 2 - The net inflow of main funds into the chemical raw materials sector was 481 million yuan, while retail funds experienced a net outflow of 276 million yuan and speculative funds saw a net outflow of 205 million yuan [2] - A table detailing the fund flow for individual stocks in the chemical raw materials sector is included [2]