Cross-Linked Casein Derivative from Canada
Cross-linked casein derivative features polymerized casein chains for biomedical coatings and slow-release fertilizers. It is covered by HTS 3501.90.60.00 as other derivatives, explicitly excluding hardened proteins of 3913. The cross-linking process defines its modified protein structure.
Duty Rate — Canada → United States
60%
Rate breakdown
9903.03.1350%Articles the product of Canada as provided in subdivision (b)(2) of U.S. note 51 to this subchapter
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Document cross-linking agent and degree of polymerization to exclude 3913 hardened proteins
• Obtain biotech end-use letters for dual commercial/research imports
• Use nitrogen solubility index tests (>70%) to affirm non-hardened status