Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
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)
Products classified under HTS 2901.10.10.00
Research Grade Ethane Gas
High-purity ethane (C2H6) gas supplied in compressed cylinders for laboratory research and chemical synthesis. Classified under HTS 2901.10.10.00 as a separate chemically defined acyclic saturated hydrocarbon. Meets Chapter 29 note (a) for pure organic compounds.
Ultra-High Purity Butane (99.999%)
N-butane (C4H10) at 99.999% purity for semiconductor manufacturing and calibration gas standards. Pure saturated acyclic hydrocarbon under HTS 2901.10.10.00 per Chapter 29 definitions. Supplied in specialty gas cylinders.
Ethane Calibration Standard 10 ppm
Ethane gas mixture at 10 ppm in nitrogen balance for gas chromatography calibration. Principal component ethane qualifies under HTS 2901.10.10.00 as chemically defined compound per Chapter 29 note (a). NIST-traceable certified reference material.
Iso-Butane Aerosol Propellant Grade
Isobutane (2-methylpropane) >99.5% purity for aerosol packaging propellants. Pure saturated acyclic hydrocarbon classified HTS 2901.10.10.00 under Chapter 29 for separate organic compounds. Supplied in bulk pressure containers.
Liquid Ethane for Petrochemical Feed
Refrigerated liquid ethane (C2H6) for ethylene cracker feedstock in plastics production. Meets HTS 2901.10.10.00 as pure saturated acyclic hydrocarbon per Chapter 29 note (a). Transported in ISO tank containers.
N-Butane Laboratory Solvent
N-butane gas 99.9% pure used as extraction solvent in analytical chemistry labs. Saturated acyclic hydrocarbon under HTS 2901.10.10.00 per Chapter 29 definitions. Supplied in lecture bottle cylinders.
Ethane-Deuterated Isotope Standard
Fully deuterated ethane (C2D6) for NMR spectroscopy and mass spectrometry standards. Chemically defined isotopically substituted compound under HTS 2901.10.10.00. Specialty gas for research institutions.
Butane Reference Fuel RM-1
Certified reference butane (iso-butane/n-butane blend) for automotive engine testing per ASTM D1837. Pure hydrocarbon standard under HTS 2901.10.10.00. Supplied in pressure cylinders with NIST traceability.
Medical Grade Ethane for MRI
Ultra-pure ethane gas for cryogenic cooling in MRI magnet systems. Chemically defined under HTS 2901.10.10.00 as pure acyclic hydrocarbon. Medical/industrial gas specification.
Polymerization Grade Butane
High purity n-/iso-butane blend for butene production and polybutene polymerization. Meets HTS 2901.10.10.00 as saturated acyclic hydrocarbon for chemical synthesis. Bulk chemical supply.