Duty Rate (from China)
Subheadings
Products classified under Tariff item 2902.50
Electronic-Grade Styrene Monomer
Electronic-grade styrene monomer is an ultra-high purity form of styrene (C6H5CH=CH2), a cyclic hydrocarbon, with metal impurities below 1 ppm and particle counts under 5 ppb. It is used in photoresist manufacturing for semiconductor production. Despite its specialized application, it remains a separate chemically defined organic compound, classifiable under tariff item 2902.50.00.
2902.50.00Inhibited Styrene Monomer
Inhibited styrene monomer contains 10-15 ppm of tert-butylcatechol (TBC) as a polymerization stabilizer, added to ensure stability during storage and transport. The stabilizer is necessary for preservation and does not alter the product's general use, so it remains a separate chemically defined organic compound under tariff item 2902.50.00. This aligns with Chapter 29 note 1(f) allowing added stabilizers.
2902.50.00Polymer-Grade Styrene
Polymer-grade styrene is a high-purity form of styrene with over 99.7% purity and low levels of aldehydes and peroxides, specifically produced for polystyrene and ABS resin manufacturing. As a separate chemically defined cyclic hydrocarbon, it falls under tariff item 2902.50.00. The high purity does not affect classification, as it remains a single compound.
2902.50.00Styrene for SBR Rubber Production
Styrene monomer refined for styrene-butadiene rubber (SBR) production has controlled impurity levels to prevent interference with rubber curing. It is a separate chemically defined cyclic hydrocarbon, classifiable under tariff item 2902.50.00. The refinement for a specific application does not change its chemical identity.
2902.50.00Styrene Monomer
Styrene monomer (C6H5CH=CH2) is a clear, colorless liquid cyclic hydrocarbon used as a building block for polystyrene plastics and synthetic rubbers. It is a separate chemically defined organic compound, falling under tariff item 2902.50.00. This is the standard form of styrene for general industrial use.
2902.50.00Styrene with Anti-Dusting Agent
Styrene with an anti-dusting agent contains a trace odoriferous substance, such as methyl acrylate, added solely for safety identification. This addition is permitted under Chapter 29 note 1(g) as it does not make the product suitable for a specific use. The product remains a separate chemically defined cyclic hydrocarbon, classifiable under tariff item 2902.50.00.