化工行业周报20251228：国际油价持平，MDI价格略跌、醋酸价格上涨-20251228

Investment Rating - The report rates the chemical industry as "Outperform" [1] Core Views - The report suggests focusing on undervalued leading companies in the industry, the impact of "anti-involution" on supply in related sub-industries, and the increasing importance of self-sufficiency in electronic materials companies and certain new energy materials companies amid price increases [1][9] Industry Dynamics - As of December 22-28, 2025, among 100 tracked chemical products, 34 saw price increases, 32 saw declines, and 34 remained stable. 55% of products had month-on-month average prices rising, while 35% fell, and 10% remained unchanged [8][27] - International oil prices remained stable, with WTI crude futures closing at $56.74 per barrel (up 0.14%) and Brent crude at $60.64 per barrel (up 0.28%) [28] - MDI prices slightly decreased, with pure MDI averaging 18,100 CNY/ton (down 4.23% week-on-week) and polymer MDI at 14,300 CNY/ton (down 2.39%) [29] - Acetic acid prices increased to 2,496 CNY/ton (up 2.93% week-on-week) [30] Investment Recommendations - As of December 27, 2025, the SW basic chemical industry P/E ratio (TTM excluding negative values) is 25.60, at the 76.58% historical percentile, while the P/B ratio is 2.33, at the 61.10% historical percentile. The SW oil and petrochemical industry P/E ratio is 13.17, at the 37.56% historical percentile, and the P/B ratio is 1.28, at the 36.98% historical percentile [9] - Recommendations include focusing on undervalued leading companies, the impact of "anti-involution" on supply, and the importance of self-sufficiency in electronic materials and certain new energy materials companies [9] - Long-term investment themes include expected demand recovery supported by policies, continuous optimization of supply, and the potential for performance and valuation improvements for leading companies [9] - Recommended stocks include Wanhua Chemical, Hualu Hengsheng, Satellite Chemical, and others [9]