900902 Sigma-Aldrich

Hyflon® AD 40H

Synonym: Amorphous perfluoropolymer, P(TTD-TFE), Poly(tetrafluoroethylene-co-2,2,4-trifluoro-5-trifluoromethoxy-1,3-dioxole), TTD-TFE copolymers

  • CAS Number 161611-79-6

  • Linear Formula (C4F6O3)n(C2F4)m



Related Categories Actuators, Bioelectronics, Ferroelectric Polymers, Flexible Organic Transistors, Fluorocarbons,
description   Glass Transition Temperature: 90 °C (ASTM D3418)
  Specific gravity: 1.98 (ASTM D792)
form   powder
composition   TTD content, 40 mol % ±5 mol % by
refractive index   n/D 1.331 (ASTM D542)
intrinsic viscosity   120 cm3/g±30 cm3/g(30 °C) (ASTM D2857)



Hyflon® AD 40H is an amorphous perfluoropolymer available in powder form.

• Amorphous glassy polymer structure.
• Solubility in perfluorinated solvents.
• Low dielectric constant of 2.0 at 1 kHz.
• Excellent optical properties:
- High UV transmittance.
- Low refractive index.

Hyflon® AD can provide uniform and thin films or coatings (down to submicron thickness if required) by casting or coating techniques and thermal treatments, well below the typical baking temperatures of semicrystalline perfluoropolymers.

Key features of Hyflon® AD amorphous perfluoropolymers:
• High temperature stability.
• Good chemical resistance.
• Excellent hydrophobicity.
• Very low surface energy.
• Low dielectric constant.
• Very high gas permeability and selectivity.
• Outstanding optical properties (e.g. high UV transmittance, low refractive index).

Examples of typical applications include:
• Protective coatings.
• Interlayer dielectric films and pellicles for electronics.

Legal Information

Hyflon is a registered trademark of Solvay Group

Safety & Documentation

Safety Information

NONH for all modes of transport


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