Silicone Novolac Resin Powder
Thermosetting silicone novolac hybrid resin powder for semiconductor encapsulation. 3911.90.91.50 as thermosetting NES primary polymer.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If silicones with predominant siloxane units
Silicone polymers (polysiloxanes) specifically in 3910, even thermosetting.
If predominantly phenolic content
Novolac base with 95% phenolic monomers goes to 3909.40.
If extruded articles of thermosetting plastics
Profiles/tubes of specified plastics in 3923 by shape.
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
• RoHS compliance certs essential for electronics resins
• Confirm <5% siloxane if pure silicone; shifts to 3910
• UL94 flammability ratings support classification evidence
Related Products under HTS 3911.90.91.50
Melamine-Formaldehyde Resin Granules
Thermosetting melamine-formaldehyde resin in granular primary form, used for molding durable laminates and coatings. Classified under HTS 3911.90.91.50 as a thermosetting polymer not elsewhere specified, meeting the criteria where the monomer units contribute over 95% by weight per subheading note (a)(1).
Urea-Formaldehyde Resin Powder
Thermosetting urea-formaldehyde resin powder in primary form for particleboard adhesives and molded products. Falls under 3911.90.91.50 as a thermosetting product NES, compliant with polymer classification rules based on predominant monomer weight.
Epoxy Novolac Resin Pellets
High-performance thermosetting epoxy novolac resin in pellet form for electronics encapsulation. HTS 3911.90.91.50 applies to this NES thermosetting polymer in primary form, where epoxy and novolac units predominate per note (a)(4).
Diallyl Phthalate Resin Granules
Thermosetting diallyl phthalate (DAP) resin granules for high-temperature electrical components. Classified in 3911.90.91.50 as other thermosetting polymers in primary forms not specified elsewhere.
Polyimide Prepolymer Powder
Thermosetting polyimide prepolymer powder in primary form for aerospace composites. Under 3911.90.91.50 as NES thermosetting product, classified by predominant imide monomer units.
Cyanate Ester Resin Flakes
Thermosetting cyanate ester resin flakes for radar-transparent composites. HTS 3911.90.91.50 covers this primary form thermoset NES in Chapter 39.