</>Build with Tariff Intelligence|Programmatic access to tariff calculations and HS code classification.Explore Developer Resources →

Gypsum Board Dispersant Lignosulfonate from Canada

Low-viscosity ammonium lignosulfonate solution optimized for gypsum slurry flow in wallboard manufacturing. Derives from concentrated, desugared softwood pulp lyes qualifying for HTS 3804.00.5000.

Duty Rate — Canada → United States

13.7%

Rate breakdown

9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada

Import Tips

Construction chemical importers need ASTM performance specs

Shelf-life testing prevents rejection of aged product

Multiple suppliers; verify consistent sulfonation degree