PMMP Flame-Retardant Polymer Granules
PMMP (Poly(1,3-phenylene methylphosphonate)) granules are primary-form thermoplastic resin used in engineering plastics for fire safety. Classified under HTS 3911.20.00.00 as the specifically enumerated phosphonate polymer meeting 95% monomer content requirement. These granules require melt processing into final flame-retardant components.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If not pure poly(1,3-phenylene methylphosphonate)
Other polysulfones/polysulfides not specifically named go to 3911.90 'Other' when lacking the exact phosphonate structure.
If for phosphonate monomer rather than polymerized form
Unpolymerized phosphonic/phosphinic acid compounds classified as organic chemicals in Chapter 29, not Chapter 39 polymers.
If formulated as finishing agents for textiles
Polymer preparations used as finishing agents excluded from Chapter 39 per Note 3, classified in 3809 instead.
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
• Provide FTIR/ NMR analysis confirming PMMP structure and purity; avoid common pitfall of declaring as generic 'phosphorus plasticizer' which shifts to 3904; check for anti-dumping on Asian-sourced phosphonate polymers
Related Products under HTS 3911.20.00.00
Poly(1,3-phenylene methylphosphonate) Resin Pellets
Poly(1,3-phenylene methylphosphonate), a phosphorus-containing polymer, is supplied in primary form as translucent pellets for processing into flame-retardant plastics. It falls under HTS 3911.20.00.00 as a specifically named polymer in primary forms (pellets) not elsewhere classified in Chapter 39. This material meets the subheading note requiring the named monomer units to contribute 95% or more by weight.
Phosphenon PMP-300 Flame Retardant Resin
Phosphenon PMP-300 is a commercial-grade poly(1,3-phenylene methylphosphonate) resin in primary prill form for compounding into PC/ABS blends. HTS 3911.20.00.00 specifically covers this named phosphorus polymer meeting purity standards. Used primarily for high-performance flame-retardant thermoplastics.
TE-33 Polyphosphonate Primary Pellets
TE-33 grade poly(1,3-phenylene methylphosphonate) pellets designed for extrusion into flame-retardant sheets and profiles. This primary form polymer is specifically named in HTS 3911.20.00.00 due to its defined chemical structure and 95%+ monomer purity. Provides halogen-free fire resistance in thermoplastics.