Cyanate Ester Prepolymer Powder from Japan
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.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
Import Tips
• Certify powder particle size distribution doesn't constitute 'articles' under 3926
• Provide DSC thermograms showing curing exotherm
• Common error: classifying as epoxy under 3907.30 when cyanate functional