Supersulfated Cement Powder from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
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