Supersulfated Cement Powder from Canada
Though related to slag cements, certain supersulfated formulations with unique gypsum-calcium sulfate ratios qualify as 'other' under HTS 2523.90.00.00. This hydraulic cement develops strength through sulfate reactions, suitable for marine structures. Excluded from pure slag cement (2523.28) by composition specifics.
Duty Rate — Canada → United States
10%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Submit sulfate and slag content certificates; >85% slag shifts to 2523.28
• Label clearly as hydraulic to prevent confusion with non-hydraulic limes (2522)
• Watch for EU origin certificates as supersulfate imports often face specific trade agreements