DAS (4,4'-Diamino-2,2'-stilbenedisulfonic acid) Technical Grade from China
Technical grade 4,4'-diamino-2,2'-stilbenedisulfonic acid (DAS) is a high-purity form of a chemically defined aromatic polyamine derivative. It is used in the production of optical brighteners and fluorescent whitening agents. As a separate chemically defined organic compound, it falls under tariff item 2921.59.00.
Duty Rate — China → Canada
0%
Import Tips
• Confirm the product is chemically defined and meets technical grade specifications
• Provide the CAS number and quality certificate to customs
• Check if the product requires any special permits under Canadian regulations