Standard International Trade Classification
U.S. imports of Mixtures of Natural Rubber and Synthetic Rubber in Primary Forms (SITC 23218) totaled $57K in August 2026, imported from 11 countries.
Importers of Mixtures of Natural Rubber and Synthetic Rubber in Primary Forms paid $381 in duties in August 2026, an average duty rate of 0.66% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Mixtures of Natural Rubber and Synthetic Rubber in Primary Forms imports of $57K in August 2026 ran 25% below the year-to-date monthly average of $76K.
Last updated: August 2026 dataPre-blended mixtures of natural rubber or natural gums with synthetic rubber products occupy a specialized niche in the elastomer trade, offering compounders a pre-dispersed starting point that reduces in-house mixing steps and improves batch consistency. Classification of these blends depends on the specific synthetic rubber component present and the ratio of natural to synthetic content, making accurate product documentation essential to avoid misclassification into either the natural rubber or the pure synthetic rubber headings. Buyers should ensure that supplier technical data sheets clearly identify both the natural rubber grade and the synthetic polymer type, as this information directly supports correct SITC assignment.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
6 import shipments a month
Importers should obtain a certificate of analysis or technical data sheet that identifies the natural rubber grade, the specific synthetic rubber polymer (e.g., SBR, BR, IR), and the approximate weight ratio of each component. This information is necessary to determine whether the blend classifies under SITC 23218 or whether the synthetic component's proportion is sufficient to shift classification to a pure synthetic rubber heading.
Not necessarily. The addition of fillers such as carbon black, silica, or process oils can shift the classification from a primary-form rubber blend to a compounded rubber mixture, which may fall under a different heading entirely. Importers should consult a licensed customs broker or request a binding ruling when the blend contains significant filler loadings.
Basic heading 185 of 239 in section 2
Basic heading 23218 · $57K of $3.8B
Trade Directory
List your company and tag the 6-digit products you trade, so the companies trading them can find you. Be the first supplier listed.
Imports · August 2026
origin
Mexico and China together supply 99% of it. China pays 37.5% duty; Mexico 0.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$57KYoY · free account
Exports
$54KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $870K of Mixtures of Natural Rubber and Synthetic Rubber in Primary Forms and exported $1.2M.
Fewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through August 2026. Source: U.S. Census Bureau.