Bismuth Subnitrate Catalytic Promoter from China
Bismuth subnitrate used as promoter in automotive catalytic converters and NOx reduction systems. This basic bismuth nitrate qualifies under HTS 3815.90.1000 as wholly inorganic reaction accelerator. Enhances thermal stability of noble metal catalysts.
Duty Rate — China → United States
44%
Rate breakdown
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Thermal analysis (TGA/DSC) verifying decomposition profile typical of catalytic-grade material
• End-use statement specifying emission control application prevents reagent classification
• Particle size distribution critical for promoter dispersion in final catalyst formulation