Bismaleimide-Triazine (BT) Resin Pellets
BT resin is a thermosetting polymer formed from 1,1'-Bis(methylenedi-4,1-phenylene)-1H-pyrrole-2,5-dione copolymerized with 4,4'-methylenebis(benzeneamine), used in high-performance laminates. It falls under HTS 3911.90.35.00 due to its specific aromatic thermosetting composition in primary pellet form. This material provides excellent thermal stability for electronics applications.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If monomer units do not meet exact named copolymer specification
Polymers not matching the specific bismaleimide copolymer fall into the general 'other thermosetting' category within the same aromatic series.
If for unmodified poly(p-phenylene oxide) polymers
If chemically similar but derived from different aromatic monomers like polyphenylene ether, classification shifts to Chapter 39 heading for those polymers.
If imported as prepregs or combined with reinforcement fibers
Plates, sheets, or profiles incorporating the resin with glass fabric become 'other plates/sheets' rather than primary form polymers.
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Import Tips & Compliance
• Verify monomer composition meets the 95% threshold for named copolymer per subheading note (a)(2); provide technical data sheets confirming aromatic thermosetting nature
• Ensure proper storage conditions during transit to prevent premature curing
• Common pitfall: misclassification as generic polysulfone under 3911.90.55.00
Related Products under HTS 3911.90.35.00
Hydrocarbon Novolac Cyanate Ester Resin Granules
A thermosetting resin derived from hydrocarbon novolac cyanate ester, specified under HTS 3911.90.35.00 for its aromatic-modified structure in primary granular form. Used in aerospace composites for superior heat resistance and low dielectric properties. Meets chapter note requirements for polymers obtained from modified aromatic monomers.
BT Resin for Multilayer PCB Laminates
Pelletized bismaleimide copolymer resin specifically matching the named chemical structure in HTS 3911.90.35.00, supplied in primary form for laminate production. Its high Tg (glass transition) makes it ideal for advanced semiconductor packaging. Classification follows subheading note (a)(1) for polymers with 95%+ named monomer content.
Cyanate Ester Prepolymer Powder
Hydrocarbon novolac cyanate ester in powdered primary form, directly specified in HTS 3911.90.35.00 for aromatic thermosetting resins. Used in molding compounds for IC packaging with excellent electrical properties. Polymer classification per note 3 to Chapter 39 for these specialized products.
High-Tg Bismaleimide Resin Flakes
Flake-form bismaleimide-triazine copolymer per exact chemical specification of HTS 3911.90.35.00, in primary form for composite prepreg production. Offers Tg >250°C for demanding telecom applications. Aromatic monomer content exceeds 95% threshold per subheading note.
Aerospace-Grade Cyanate Ester Resin
Hydrocarbon novolac cyanate ester resin meeting HTS 3911.90.35.00 specification for thermosetting aromatic polymers in primary forms. Critical for RTM processing in aircraft radomes. Low moisture absorption and high char yield characteristics.
BT Resin Molding Compound Base
Unfilled bismaleimide resin base for encapsulation compounds, classified under HTS 3911.90.35.00 as specified thermosetting copolymer. Provides ultra-low CTE matching silicon. Primary form before filler addition.