Harmonized System
U.S. imports of Technically Specified Natural Rubber (TSNR) (HS 400122) totaled $92.1M in August 2026, imported from 30 countries.
Importers of Technically Specified Natural Rubber (TSNR) paid $144K in duties in August 2026, an average duty rate of 0.16% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataTechnically specified natural rubber — marketed under grade designations such as SMR (Malaysia), SIR (Indonesia), and STR (Thailand) — is defined by measurable physical and chemical properties (dirt content, ash, nitrogen, volatile matter, plasticity) rather than visual inspection, making it the preferred form for large-scale tire and automotive component manufacturing. Indonesia leads US supply, followed by Thailand and Côte d'Ivoire. The US tariff schedule breaks TSNR into specific grades including Grade 5 (4001220005), Grade CV (4001220010), Grade 1 (4001220015), Grade 10 (4001220020), and Grade 20 (4001220025), with an NESOI line (4001220050) for other variants. Constant viscosity (CV) grade, stabilized with hydroxylamine, is particularly sought after by manufacturers requiring consistent Mooney viscosity across production runs.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
1.3K import shipments a month
Constant viscosity (CV) grade is treated with hydroxylamine to prevent storage hardening, delivering a stable Mooney viscosity (typically ML 1+4 at 100°C of 60 or 50) that reduces mixing time and energy consumption on the factory floor. It is classified under 4001220010 and is especially valued by tire cord and technical rubber goods producers who need batch-to-batch consistency.
CBP expects the commercial invoice and packing list to identify the specific TSNR grade (e.g., SMR 20, SIR 10, STR CV60) along with the corresponding test certificate issued by the exporting country's rubber authority. Mismatches between the declared grade and the test certificate can trigger reclassification into the NESOI line (4001220050) or a request for re-examination, so aligning shipping documents with laboratory certificates before export is essential.
Subheading 1 of 5 in heading 4001
Subheading 400122 · $92.1M of $112.4M
Trade Directory
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ImportsExports
Imports
$92.1MYoY · free account
Exports
$2.5MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $1.1B of Technically Specified Natural Rubber (TSNR) and exported $22.2M.
Through August 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 4001220025 | Technically Specified Natural Rubber, Grade 20 | $60.1M | 0.19% | 1.91% | $115K |
| 4001220020 | Technically Specified Natural Rubber, Grade 10 | $22.4M | 0.00% | 0.00% | -- |
| 4001220010 | Technically Specified Natural Rubber, Grade Cv | $7.3M | 0.0019% | 0.83% | $141 |
| 4001220050 | Technically Specified Natural Rubber, NESOI | $1.3M | 2.32% | 12.25% | $29K |
| 4001220015 | Technically Specified Natural Rubber, Grade 1 | $894K | 0.00% | 3.22% | -- |
| 4001220005 | Technically Specified Natural Rubber, Grade 5 | $44K | 0.00% | 0.00% | -- |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 4001220000 | Technically Specified Natural Rubber (Tsnr) | $2.5M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · August 2026
origin
Côte d'Ivoire and Thailand together supply 58% of it.
customs district
destination
entry
rate provision · imports
98.4% enters free of duty; duty collected equals 0.16% of imports for consumption.