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SITCSection 5
U.S. imports of prepared rubber accelerators (SITC 59863) totaled $2.1M in April 2026, traded with 16 countries.
Importers of Prepared Rubber Accelerators paid $503K in duties in April 2026 — an effective duty rate of 24% on $2.1M in dutiable value, based on actual customs collections rather than the published tariff schedule. Prepared Rubber Accelerators imports of $2.1M in April 2026 ran 15% above the year-to-date monthly average of $1.8M.
Last updated: April 2026 dataRubber accelerators are organic or inorganic compounds that dramatically shorten vulcanization time and improve the physical properties of cured rubber, and prepared formulations — blends or masterbatches ready for direct incorporation — are the commercially dominant form traded internationally. Major chemical families include thiazoles, sulfenamides, thiurams, dithiocarbamates, and guanidines, each offering different cure speed, scorch safety, and compatibility profiles suited to tire, automotive seal, footwear, and industrial rubber goods manufacturing. Several accelerator chemistries — particularly thiurams and dithiocarbamates — face regulatory scrutiny in some markets due to nitrosamine formation potential, a compliance consideration that affects product selection and documentation requirements for export-oriented rubber goods producers.
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The principal families are sulfenamides (e.g., CBS, TBBS) for delayed-action, scorch-safe curing preferred in tire compounds; thiazoles (e.g., MBT, MBTS) for general-purpose applications; thiurams for ultra-fast or sulfur-donor curing; dithiocarbamates for low-temperature or latex applications; and guanidines as secondary accelerators. Selection depends on cure temperature, processing safety window, and the end-product's dynamic performance requirements.
Yes. Thiuram and dithiocarbamate accelerators can generate nitrosamines during processing or in the finished article, which has led to restrictions or labeling requirements in the EU and other jurisdictions. US importers supplying rubber goods to European customers should verify that accelerator choices comply with applicable REACH restrictions and customer specifications, and should request safety data sheets and composition disclosures from suppliers.
Monthly import values over time
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