Bis(polyoxyethylene) methylphosphonate (BPEMP)
Bis(polyoxyethylene) methylphosphonate is a specific polyether compound classified under HTS 3907.21.00.00 due to its chemical structure as a phosphonate ester of polyoxyethylene chains. It is primarily used as a flame retardant additive in plastics, textiles, and coatings. This primary form polymer meets the subheading note requiring the named structure to predominate by weight.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If chemically modified or impure blend
Chemically modified polyethers or those not meeting 95% purity for named compound fall under 'Other polyethers, nesoi' per subheading note (a)(3).
If imported as flame retardant formulation mixture
Mixtures of chemicals not predominantly one polymer classified as chemical preparations rather than primary polymers.
If classified by phosphonate functional group
Phosphonic/phosphinic acid derivatives may shift to Chapter 29 if not primarily polyether by weight per polymer classification rules.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Verify chemical composition via certificate of analysis to confirm 95%+ purity of the bis(polyoxyethylene) methylphosphonate structure per subheading notes
• Include Safety Data Sheets (SDS) and REACH compliance docs for flame retardant chemicals to avoid CBP holds
• Avoid misclassification as general polyethers (3907.20); specify exact nomenclature in entry docs
Related Products under HTS 3907.21.00.00
Phosflex 71B Flame Retardant
Phosflex 71B is a commercial grade bis(polyoxyethylene) methylphosphonate used as a low-viscosity reactive flame retardant. It falls under HTS 3907.21.00.00 as it matches the specific polyether phosphonate structure in primary liquid form. Commonly incorporated into polyurethane foams and coatings during manufacturing.
Antiblaze 182 Flame Retardant
Antiblaze 182 is a registered trademark for bis(polyoxyethylene) methylphosphonate in primary form, specifically for textile and paper coatings. HTS 3907.21.00.00 applies due to its precise chemical identification as the named polyether. Provides reactive flame retardancy without migration.
TEP-Enhanced BPEMP Polyether
This is a triethyl phosphate-modified bis(polyoxyethylene) methylphosphonate formulation maintaining >95% named polymer content. Classified under 3907.21.00.00 per subheading note (a)(1) as the core monomer units predominate. Used in flexible PU foams for furniture and automotive applications.