Styrene Monomer
Styrene monomer (C6H5CH=CH2) is a clear, colorless liquid cyclic hydrocarbon used primarily as a building block for polystyrene plastics and synthetic rubbers. It falls under HTS 2902.50.00.00 as a separate chemically defined cyclic hydrocarbon, specifically styrene. This unsaturated aromatic compound polymerizes readily when initiated.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing >50% benzene by weight
Mixtures of hydrocarbons with >50% aromatic content like benzene are classified in Chapter 27 as light oils, not pure cyclic hydrocarbons.
If technical grade with >5% impurities
Substantially chemically impure preparations not meeting Chapter 29 note 2(a) requirements classify as chemical preparations in Chapter 38.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Verify purity levels (>99.5%) via Certificate of Analysis to confirm classification as chemically defined styrene, avoiding mixtures under Chapter 27
• Include Material Safety Data Sheets (MSDS) documenting inhibitor content (e.g
• TBC) as stabilizer permitted under Chapter 29 note 2(f)
• Ensure proper UN1266 hazmat labeling and IBC/steel drum packaging compliant with DOT regulations for flammable liquids
Related Products under HTS 2902.50.00.00
Inhibited Styrene Monomer
Inhibited styrene monomer contains 10-15 ppm tert-butylcatechol (TBC) as a polymerization stabilizer, maintaining stability during storage and transport. Classified under HTS 2902.50.00.00 per Chapter 29 note 2(f) allowing stabilizers necessary for preservation. Used in resin manufacturing and as copolymer feedstock.
Polymer-Grade Styrene
High-purity polymer-grade styrene (>99.7% purity, low aldehydes/ peroxides) specifically manufactured for polystyrene (PS) and ABS resin production. Meets HTS 2902.50.00.00 as chemically defined styrene cyclic hydrocarbon. Supplied in bulk for injection molding and extrusion applications.
Styrene for SBR Rubber Production
Styrene monomer refined for styrene-butadiene rubber (SBR) copolymerization, with strict control of impurities affecting rubber curing. HTS 2902.50.00.00 classification as pure cyclic hydrocarbon. Bulk liquid transported to tire manufacturing facilities.
Electronic-Grade Styrene Monomer
Ultra-high purity electronic-grade styrene (<1 ppm metals, <5 ppb particles) used in photoresist manufacturing for semiconductor production. Still classifies under HTS 2902.50.00.00 as chemically defined styrene despite end-use purity specs. Supplied in cleanroom-compatible containers.
Styrene with Anti-Dusting Agent
Styrene containing trace odoriferous substance (e.g., methyl acrylate) added solely for safety identification per Chapter 29 note 2(g). Remains classified HTS 2902.50.00.00 as the addition doesn't render it suitable for specific use. Used in standard polymer applications.