Fluorinated Dianhydride 4,4'-HFIPA
4,4'-HFIPA is the standard industry name for 4,4'-(Hexafluoroisopropylidene)bis(phthalic anhydride), a separate chemically defined compound under HTS 2917.39.12.00. It is indispensable for gas separation membranes and high-temperature coatings due to its fluorinated structure.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified as halogenated aromatic halide
Pure halide functions without anhydride group would go to 2908, but dominant anhydride dictates later 2917 classification per notes.
If used as synthetic fluorescent brightener intermediate
Derivatives for luminophores classify in Chapter 32, excluding Chapter 29 per exclusion notes.
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Import Tips & Compliance
• Declare as 'corrosive solid' for customs valuation; ensure inert atmosphere packaging; check for anti-dumping duties from Asian producers
Related Products under HTS 2917.39.12.00
4,4'-(Hexafluoroisopropylidene)bis(phthalic anhydride) 98% purity
This is a high-purity aromatic polycarboxylic anhydride featuring a hexafluoroisopropylidene bridge between two phthalic anhydride units, classified under HTS 2917.39.12.00 as a specific derivative of aromatic polycarboxylic acids. It serves as a key monomer in producing high-performance fluorinated polyimides for advanced materials.
6FDA Monomer -- 4,4'-(Hexafluoroisopropylidene)bis(phthalic anhydride)
Known as 6FDA, this fluorinated dianhydride is a chemically defined aromatic polycarboxylic anhydride under HTS 2917.39.12.00, used primarily in synthesizing polyimides with exceptional thermal and chemical resistance. Its specific structure with fluorine substitution distinguishes it from other aromatic anhydrides.
HFBPA Anhydride -- 99% Technical Grade
HFBPA, or 4,4'-(Hexafluoroisopropylidene)bis(phthalic anhydride), is a technical-grade aromatic dianhydride explicitly listed in HTS 2917.39.12.00 for its role in fluoropolymer production. It provides optical transparency and low dielectric constants in resulting polyimide materials used in semiconductors.
2,2-Bis(3,4-dicarboxyphenyl)hexafluoropropane Dianhydride
This systematic name refers to 4,4'-(Hexafluoroisopropylidene)bis(phthalic anhydride), a specific aromatic anhydride in HTS 2917.39.12.00, valued for producing colorless polyimides in optical applications. Its chemical purity ensures consistent polymerization properties.