First, let's understand a concept. Fine chemicals. Chemicals with characteristics such as low investment, high rate of return, high profit margin, high added value, high knowledge intensity, and long patent period in small quantities and multiple varieties are called fine chemicals. The industry that produces fine chemicals is collectively called fine chemical industry. Fine chemical products in China include 11 product categories: pesticides; dyes; coatings (including paints and inks); pigments; reagents and high-purity substances; information chemicals (including chemicals that can receive electromagnetic waves such as photosensitive materials and magnetic materials); food and feed additives; adhesives; catalysts and various auxiliaries; (chemically produced by the chemical industry system) chemical drugs (bulk drugs) and daily-use chemicals; functional polymer materials in polymer polymers (including functional membranes, polarizing materials, etc.).