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Fluorosilicone Polymer Gum from Japan

Fluorosilicone gum stock is used in aerospace seals requiring fuel resistance. Primary form classification under HTS 3910.00.00.00 when fluoroalkyl siloxane monomers predominate.

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

Provide monomer ratio analysis showing siloxane family dominance

Aerospace customers require MIL-spec certification at entry

Avoid compounded gums to stay in primary forms