4-Chlorophthalic anhydride

Hangzhou Verychem Science and Technology Co. Ltd manufactures this industrial-grade 4-chlorophthalic anhydride (CAS 118-45-6, also known as 5-chloro-2-benzofuran-1,3-dione) in-house. The company describes it as a key raw material for producing biphenyl tetracarboxylic dianhydride, diphenyl ether tetracarboxylic dianhydride, diphenyl sulfide tetracarboxylic dianhydride, and related monomers used to make high-temperature-resistant polyimide engineering plastics; samples are available, and it is sold across North America, Central/South America, Western Europe, Eastern Europe, Australasia, Asia, and the Middle East.