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