化工板块低开高走，指数涨超2%，关注化工行业ETF易方达（516570）等产品投资机会

Group 1 - The core viewpoint of the article highlights the positive performance of the chemical sector, with the China Petroleum and Chemical Industry Index rising by 2.5%, driven by significant gains in stocks such as Tongkun Co., New Fengming, Hengli Petrochemical, and Rongsheng Petrochemical [1] - The polyester fiber industry is experiencing a widening price gap between upstream and downstream, with increased support from upstream costs boosting market sentiment and leading to rising prices for PX, MEG, and PTA [1] - Analysts predict that the polyester filament industry may see a concentrated resumption of work and inventory replenishment after the Spring Festival, making the traditional price increase window in March and April noteworthy [1] Group 2 - The China Petroleum and Chemical Industry Index includes major chemical leaders, with approximately 60% in basic chemicals and 30% in petroleum and petrochemicals, focusing on sub-industries with clear supply and demand improvements [1] - The recent performance of the chemical sector ETF, E Fund (516570), has attracted around 1.5 billion yuan in investments over the past month, benefiting from a low management fee rate of 0.15% per year [2]