2930.90.92.31/N-Oxydiethylenebenzothiazole-2-Sulfenamide (NOBS/MBS)/Mexico

N-Oxydiethylenebenzothiazole-2-Sulfenamide (NOBS/MBS) from Mexico

NOBS provides delayed vulcanization with rapid curing rates, ideal for thick rubber articles like tires. This sulfenamide's principal rubber processing function places it under HTS 2930.90.92.31 as a chemically defined organo-sulfur compound.

Duty Rate — Mexico → United States

100%

Rate breakdown

9903.04.6096.3%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate

9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)

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Import Tips

• Specify 'sulfenamide accelerator' on commercial invoice with CAS 102-77-2

• Purity >96% required for this classification; lower grades become mixtures

• Shelf life declaration important as these decompose over time