HS Code for HFO-1336mzz

HFO-1336mzz, chemically known as (Z)-1,1,1,4,4,4-hexafluoro-2-butene, is classified under HS code 2903.51. This classification is based on its chemical structure as an unsaturated fluorinated derivative of an acyclic hydrocarbon. Within Chapter 29 of the Harmonized System, heading 2903 covers halogenated derivatives. The subheadings are divided based on whether the hydrocarbon chain is saturated or unsaturated. As an "olefin" (HFO), HFO-1336mzz contains a double bond, which classifies it as unsaturated. Subheading 2903.51 was specifically established in the 2022 HS updates to include a group of environmentally preferable fluorinated gases, namely HFO-1234yf, HFO-1234ze, and HFO-1336mzz. The classification logic is driven by the explicit mention of hexafluoro-2-butene in the subheading text. This substance is primarily used as a high-efficiency blowing agent for polyurethane foams and as a refrigerant with low Global Warming Potential. Accurate classification under 2903.51 is essential for distinguishing this unsaturated compound from saturated hexafluorobutanes, which would fall under different subheadings.

Products Included

• (Z)-1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336mzz-Z)
• (E)-1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336mzz-E)
• Hexafluorobutene isomers used as blowing agents
• HFO-1336mzz used in chiller applications

Common Misclassification

HFO-1336mzz is often misclassified under HS code 2903.59, the residual category for other unsaturated fluorinated derivatives. This occurs when the specific listing in 2903.51 is not identified. It may also be confused with saturated fluorinated hydrocarbons in the 2903.4x range if the unsaturated nature of the carbon-carbon bond is not recognized by the declarant.

FAQ

What is the HS code for HFO-1336mzz?

The HS code for HFO-1336mzz is 2903.51.

Is HFO-1336mzz classified with other HFOs?

Yes, HFO-1336mzz is grouped together with HFO-1234yf and HFO-1234ze under the same HS code, 2903.51, as they are all specific unsaturated fluorinated derivatives.