Group 1 - The chemical sector experienced a decline on October 22, with the chemical ETF (516020) dropping over 1% at one point before recovering slightly to a decrease of 0.55% [1] - Key stocks in the sector, including fluorine chemicals, lithium batteries, civil explosives, and potash fertilizers, saw significant declines, with companies like Duofluoride and Tianci Materials both falling over 4% [1][2] - Tianci Materials announced on October 21 that it has completed the technical reserve for sodium-ion battery electrolytes and related core materials, showcasing its strategic extension into sodium-ion battery technology [3] Group 2 - Analysts noted that Tianci Materials' integrated advantages in lithium battery electrolytes have positioned the company favorably for future growth, indicating strong technical adaptability and market insight [3] - As of October 21, the chemical ETF's underlying index had a price-to-book ratio of 2.24, which is at a low point historically, suggesting attractive long-term investment opportunities [3] - Looking ahead, the chemical industry is expected to improve due to the implementation of growth plans, with a focus on sectors such as pesticides, polyester filament, coal chemicals, phosphate, and potash fertilizers [4] Group 3 - Domestic policies are emphasizing supply-side structural optimization, while international factors like rising raw material costs and capacity reductions in Europe and the U.S. are creating uncertainties in chemical supply [4] - The chemical ETF (516020) tracks the CSI segmented chemical industry theme index, covering various sub-sectors and concentrating nearly 50% of its holdings in large-cap leading stocks [5] - Investors can also consider the chemical ETF linked funds (Class A 012537/Class C 012538) for exposure to the chemical sector [5]