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4,4'-(Hexafluoroisopropylidene)diphthalic anhydride (6FDA), CAS 1107-00-2, is a fluorinated dianhydride monomer widely used in the synthesis of high-performance polyimides and polyamides.
It is valued for imparting properties such as high thermal stability (glass transition >300°C),
low dielectric constants, optical transparency, moisture resistance, and controlled free volume,
making it particularly suitable for advanced electronic and optical polyimide systems.
Basic Information of 6FDA
| Product Name | 4,4'-(Hexafluoroisopropylidene) diphthalic anhydride |
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| Abbreviation | 6FDA |
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| CAS Number | 1107-00-2 |
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| Molecular Formula | C19H6F6O6 |
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| Molecular Weight | 444.24 g/mol |
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| Appearance | White powder |
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| Purity | ≥99.9% |
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| Metal Ion | 1 ppm max. for any single metal ion |
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| Package | 1 kg/bottle, 20 kg/drum, or customized |
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| Molecular Structure |  |
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Key Properties
Fluorinated groups introduce high free volume, resulting in low dielectric constant and low water absorption
Excellent optical transparency with reduced coloration due to suppressed charge-transfer interactions
Aromatic dianhydride backbone provides thermal stability and structural rigidity
Balanced mechanical strength and electrical insulation performance in derived polyimides
Good processability with soluble poly(amic acid) precursors for film and coating fabrication
Application Positioning of 6FDA
6FDA is primarily positioned for
optical and transparent polyimide systems, where low coloration, high light
transmittance, and stable optical performance are critical. The fluorinated isopropylidene group
disrupts strong intermolecular interactions, effectively suppressing charge-transfer complexes
that typically cause yellowing in aromatic polyimides.
As a secondary core application, 6FDA is widely used in
electronics and microelectronics, enabling low-dielectric polyimides that support
high-frequency signal transmission, moisture resistance, and dimensional stability during thermal processing.
Additional applications include gas separation membranes, where the high free volume and
fluorinated structure contribute to enhanced permeability and selectivity.
Key Applications of 6FDA
Optical and Transparent Polyimides:
Used in flexible display substrates, optical insulation films, and photonic components
requiring high transparency, low haze, and resistance to UV-induced discoloration.
Electronics and Telecommunications:
Enables low-k polyimides (dielectric constant as low as ~2.3) for signal insulation layers,
high-frequency electronic packaging, flexible circuits, and wearable electronics.
Gas Separation Membranes:
Applied in polyimide-based membranes (dense, hollow fiber, or mixed-matrix) with high
selectivity for CO₂/CH₄ and H₂/CH₄ separations in natural gas processing and petrochemical streams.
