U.S. exports of bis(polyoxyethylene) methylphosphonate, primary forms (HS 390721) totaled $1.7M in August 2026.
Importers of Bis(Polyoxyethylene) Methylphosphonate, Primary Forms paid $25K in duties in August 2026, an effective tariff rate of 7.74% of the $322K imported — duty actually collected as a share of that value, not the published tariff schedule. Bis(Polyoxyethylene) Methylphosphonate, Primary Forms imports of $322K in August 2026 ran 142% above the year-to-date monthly average of $133K.
Last updated: August 2026 dataBis(polyoxyethylene) methylphosphonate is a phosphorus-containing polyether used primarily as a flame-retardant additive and reactive intermediate in polyurethane and polyester formulations. Germany and Japan are the leading US import sources for this specialty chemical, reflecting the concentration of fine-chemical and phosphonate synthesis capacity in those countries. Classified under a single 10-digit line (3907210000), the product's phosphonate functionality can trigger additional scrutiny under chemical import regulations, and importers should ensure accurate CAS number documentation to avoid misclassification with structurally similar polyethers.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
14 shipments/mo
The 2017 HS revision created a dedicated subheading (390721) for this specific phosphonate-functionalized polyether to improve statistical tracking of flame-retardant intermediates and to distinguish it from non-phosphorus polyethers classified under 390729. The structural specificity—a methylphosphonate group flanked by two polyoxyethylene chains—is the defining classification criterion.
Importers should provide the supplier's certificate of analysis including the CAS number, molecular structure diagram, and phosphorus content. Because the compound sits at the boundary between polyethers (3907.21) and organophosphorus chemicals (Chapter 29), a binding ruling from CBP can provide certainty, particularly for high-volume shipments.
HSChapter 39
ImportsExports
Imports
$322KYoY · free account
Exports
$1.7MYoY · free account
12-mo low · imports
YoY · free accountOver the twelve months to August 2026, the U.S. imported $1.2M of Bis(Polyoxyethylene) Methylphosphonate, Primary Forms.
Through August 2026. Source: U.S. Census Bureau.
Subheading 11 of 11 in heading 3907
Subheading 390721 · $1.7M of $440.8M
Trade Directory
List your company under HS 390721 — Bis(Polyoxyethylene) Methylphosphonate, Primary Forms, so the companies trading it can find you. Be the first supplier listed.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3907210000 | Bis(Polyoxyethylene) Methylphosphonate | $322K | 7.74% | 47.12% | $25K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3907210000 | Bis(Polyoxyethylene) Methylphosphonate | $1.7M |
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.
Exports · August 2026
destination
Mexico and Canada together take 78% of it.
customs district
origin
entry
rate provision · imports
52.9% enters free of duty; duty collected equals 7.74% of total import value.