Here are some popular B2B websites for chemical foreign trade:

1、Alibaba: One of the largest B2B marketplaces in the world, with a vast array of chemical suppliers and buyers.
2、Chemicals.com: A B2B platform specializing in the chemical industry, connecting buyers and suppliers from around the world.
3、Tradekey: A B2B marketplace that allows buyers to find and contact suppliers of chemicals and other products.
4、MadeinChina: A platform that connects buyers with Chinese suppliers of chemicals and other products.
5、Global Sources: A B2B media company that provides a platform for suppliers to connect with buyers from around the world, including in the chemical industry.
6、ChemNet: A B2B platform that connects buyers and suppliers of chemicals, with a focus on the AsiaPacific region.
7、ICIS: A leading provider of market intelligence and news for the chemical industry, with a B2B platform that connects buyers and suppliers.
8、ChemIndustry: A B2B platform that connects buyers and suppliers of chemicals, with a focus on the global chemical industry.
9、B2B International Trade: A platform that connects buyers and suppliers from around the world, including in the chemical industry.
10、Thomasnet: A B2B platform that connects buyers and suppliers of industrial products, including chemicals.

Some Chinese B2B websites for chemical foreign trade include:

1、慧聪网 (HC360): A Chinese B2B platform that connects buyers and suppliers of chemicals and other products.
2、环球塑胶网 (PlasticNet): A B2B platform that specializes in the plastics and chemicals industry.
3、中国化工网 (ChinaChemNet): A B2B platform that connects buyers and suppliers of chemicals and other products.
4、化工资源网 (ChemResources): A B2B platform that connects buyers and suppliers of chemicals and other products.

These are just a few examples of B2B websites for chemical foreign trade、There are many more platforms available, and the best one for your business will depend on your specific needs and goals.