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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If simple polyethylene glycol phosphonate
Polyethylene oxide/propylene oxide polymers classified separately unless specifically bis(polyoxyethylene) methylphosphonate structure predominates.
If for organo-phosphorus flame retardants
Other organo-phosphorus compounds may fall under Chapter 29 if polyether content insufficient per subheading note (a)(4).
If additive mixtures with >70% surfactants
Surfactant-based additive preparations exceed polymer classification threshold.
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Import Tips & Compliance
• Provide manufacturer's specification confirming BPEMP content meets HTS naming criteria (95%+ by weight)
• Declare as 'primary form polyether' not finished product to prevent reclassification under Chapter 38
• Check TSCA registration for US import; non-compliant chemicals face seizure
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.
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.