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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If amino resins with urea/melamine dominance
If cyanate modified from amino base with 95% content, goes to 3909 series.
If formulated as prepared adhesives
Adhesives and prepared glues from polymers classified in 3506 regardless of base.
If cast into sheets >6mm thick
Thick plates/sheets of thermosets in 3920.99 by physical form.
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Import Tips & Compliance
• DSC analysis mandatory to demonstrate >200°C curing without melting
• Avoid 'adhesive' labeling; shifts to 3506 if prepared for bonding applications
• Declare low moisture content (<0.1%) to preserve thermoset reactivity
Related Products under HTS 3911.90.91.50
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