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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If higher MW polyether phosphonate
Polysiloxanes or different polyether derivatives use separate subheadings.
If technical grade mixtures
Impure preparations (<95% single polymer) classified as chemical mixtures.
If ether-alcohol derivatives
If classified by alcohol functional group rather than polymer content.
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
• Submit detailed monomer analysis showing BPEMP units >95% weight to justify specific subheading
• Label drums/barrels with UN number for flammable liquid handling during customs clearance
Related Products under HTS 3907.21.00.00
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.
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.