Fluoromethane (HFC-41) Calibration Gas from China
Trace amounts of HFC-41 in nitrogen mixtures serve as calibration standards for environmental gas analyzers monitoring fluorocarbon emissions. The pure HFC-41 component drives classification under HTS 2903.43.10.00. Used in labs for regulatory compliance testing.
Duty Rate — China → United States
16.2%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• NIST-traceable certificates; dilute gas transport regs (UN1956)
• Issue: Over-dilution may classify as prepared lab reagent