6FDA Monomer -- 4,4'-(Hexafluoroisopropylidene)bis(phthalic anhydride) from United States
6FDA, or 4,4'-(hexafluoroisopropylidene)bis(phthalic anhydride), is a fluorinated dianhydride used in synthesizing polyimides with high thermal and chemical resistance. It is a separate chemically defined aromatic polycarboxylic anhydride, and its classification under heading 29.17 is clear.
Duty Rate — United States → Canada
0%
Import Tips
• Ensure the product is pure 6FDA; if it is a mixture or contains additives, classification may change
• The use in polyimide synthesis does not affect classification
• Provide the CAS number (1107-00-2) on the commercial invoice for CBSA verification