HFC-143a Calibration Standard from China
NIST-traceable 1,1,1-trifluoroethane (HFC-143a) gas standard at 100 ppm in air for gas chromatography calibration. The principal HFC-143a component determines classification under HTS 2903.44.1020 as the named pure compound.
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
• Include NIST SRM traceability certificate and gravimetric preparation method
• Cylinder passivated with electropolished 316L SS; certify <1 RA surface finish
• Expiration dating based on shelf life testing per ISO 6141 standard