Liquefied Isobutylene (2-Methylpropene)
Liquefied isobutylene, also known as 2-methylpropene, is a branched C4 olefin gaseous hydrocarbon liquefied under pressure, falling under HTS 2711.14.00.30 as butylene. It serves as a key intermediate in producing methacrylic acid, butyl rubber, and fuels.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If separated to >99% purity for chemical synthesis
Ultra-pure isobutylene intended solely as a chemical intermediate moves to Chapter 29 acyclic hydrocarbons.
If mixture contains other unsaturated hydrocarbons like pentenes
Liquefied gas mixtures not specifically ethylene/propylene/butylene classify under other gaseous hydrocarbons.
If mixed with catalysts for rubber production
Prepared mixtures of hydrocarbons with additives for specific chemical reactions classify as mixed alkylbenzenes.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Provide gas chromatography (GC) analysis confirming isobutylene as principal isomer for accurate classification
• Use UN-approved cryogenic pressure vessels; declare exact pressure/temperature conditions on shipping documents
• Check for anti-dumping duties on C4 olefins from specific origins and maintain supply chain records
Related Products under HTS 2711.14.00.30
Liquefied 1-Butene (Butylene-1)
Liquefied 1-butene is a petroleum-derived gaseous hydrocarbon with the formula C4H8, classified under HTS 2711.14.00.30 as butylene due to its butylene chemical structure. It is commonly used as a monomer in the production of polyethylene and other polymers.
Liquefied n-Butene (cis/trans-2-Butene Mix)
Liquefied n-butene, primarily a mixture of cis- and trans-2-butene isomers, is a straight-chain butylene gas classified under HTS 2711.14.00.30. It is utilized in the synthesis of maleic anhydride and as a fuel gas component.
Liquefied Raffinate-2 Butylene Stream
Liquefied raffinate-2 is a refinery stream containing 70-90% butylene (mixed isomers) after butadiene extraction, classified as butylene under HTS 2711.14.00.30. Primarily used in gasoline blending and alkylation processes.
Polymer-Grade Liquefied Butylene (C4 Olefin Mix)
Polymer-grade liquefied butylene is a high-purity C4 olefin mixture (85%+ total butylene isomers) for polyethylene co-monomer use, falling under HTS 2711.14.00.30. Specifications ensure low impurities for resin production.