Sulfur Dioxide Calibration Gas Mixture 10ppm from China
Trace-level sulfur dioxide (10 ppm in nitrogen balance) in certified calibration cylinders for environmental air quality monitoring equipment. Primarily classified under HTS 2811.29.30.00 when SO2 is the principal compound, though mixtures may shift. Chemically defined per Chapter 28 Note 1.
Duty Rate — China → United States
41.7%
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
• Include NIST-traceable calibration certificates; declare exact ppm concentration on commercial invoice; EPA may require TSCA certification for monitoring gases