N-Butane Calibration Gas from China
Liquefied n-butane in trace concentrations for gas chromatography calibration standards. Under HTS 2711.13.00 as liquefied butane, used in laboratory quality control. Provided in certified cylinders with NIST traceability.
Duty Rate — China → United States
25%
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)
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 to this subchapter
Import Tips
• Include NIST or ISO 17025 calibration certificates for duty preference claims
• Specify exact ppm concentration to avoid reclassification as mixtures
• Use proper UN 1011 labeling for lab gas cylinders