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CYTOP Amorphous Fluoropolymers


Same excellent chemical, thermal, electrical and surface properties as conventional fluoropolymers like PTFEs, but also exhibit high optical transparency and good solubility in specific fluorinated solvents. CYTOP fluoropolymers are like transparent PTFEs.

The thermoplastic characteristics of CYTOP, coupled with its transparency, solubility, insulation properties, resistance to chemicals, and oils/water repellency, make it a popular choice for coating electronic materials. CYTOP amorphous fluoropolymers exhibits low refractive index, low coefficient of optical dispersion and good lamination properties. CYTOP amorphous fluoropolymers are available on request in various solvents (110ºC – 180ºC) and at various concentrations.

  • Transparency
  • Mold release
  • Electric insulation
  • Water and oil repellency
  • Chemical resistance
  • Moisture-proof
  • Low refractive index
  • Low coefficient of optical dispersion
  • Good lamination properties

  • Inter-level dielectric layer for semiconductors
  • Pelicles
  • Non-autofluorescence hydrophobic coating of microfluidics
  • Hydrophobic coating of Electrowetting devices
  • Antifouling coatings for photomasks
  • Optical film
  • Anti-reflective coatings
  • Graded-index optical fibers


  • High Transmittance: DUV 200 nm – NIR 2.0 µm > 95%
  • Low Refractive Index, Minimal Color Observation: nD: 1.34, Abbe #: 90
  • Electrical Properties: Dielectric constant: 2.1, volume resistivity > 1017 Ω·m
  • Thin Film Coating: Soluble in perfluoro solvent: film thickness beyond 0.1 µm

Fluoropolymer Category

Fluoropolymer Perfluoropolymer
Crystalline ETFE
Amorphous Resins LUMIFLON1 CYTOP1
Rubber AFLAS1

1Registered trademark of Asahi Glass.
2Registered trademark of DuPont.
3Registered trademark of 3M.

Optical Properties

Refractive Index 1.34 1.35 1.35 1.49 Abbe Refractormeter
Transmittance (%) 95 opaque opaque 93 Visible Region, 200 µm
Abbe Number 90 -- -- 55 Abbe Refractometor

Physical Properties

Glass Transition Temperature (°C) 108 (130) (75) 105-120 DSC
Melting Point (°C) not observed 327 310 iso 160
syn 200
Density (g/cm3) 2.03 2.14-2.20 2.12-2.17 1.19-1.20 25 °C
Contact Angle of Water (degree) 110 114 115 80 25 °C
Critical Surface Tension (dyn/cm) 19 18 18 39 25 °C
Water Absorptivity (%) <0.01 <0.01 <0.01 0.3 60 °C
in water
Durometer Hardness HDD78 HDD55 HDD58-60 HDD92 ASTM D2240
Linear Expansion
Coefficient (cm/cm/°C)
7.4*10-5 1.0*10-4 1.3*10-4 8.0*10-5 TMA (40-100 °C)


Gas Permeation Comparison of Oxygen
Gas Permeability (cm3 cm/cm2s Pa) Product Oxygen Permeation (cm3 cm/cm2s Pa)
He 8.9*10-12 CYTOP 4.2*10-13
O2 4.2*10-13 PTFE 3.2*10-13
N2 1.0*10-13 PE 2.2*10-13
Saran 4.0*10-16


Moisture Permeation
Product Permeability (cm3 cm/cm2s Pa)
CYTOP 1.1*10-12
PI 4.3*10-11
Silicon Rubber 3.2*10-9
HDPE 9.0*10-13
Saran 7.0*10-13

Chemical Resistance

Chemicals Weight Change (%) Appearance Remarks
12N HCl
99% H2SO4
50% HF
0.0 No change 60 °C*1 week
60 °C*1 week
R.T.*1 week
10% NaOH
44% NaOH
0.0 No change 60 °C*1 week
Organic Solvents
Trichloro Ethylene
Carbon Tetrachloride
0.0 No change R.T.*1 week

How to read the "Grade"

CTX-809AP2 / CTL-109AE/CTL-809M

CYTOP Molecular Weight Boiling Point of Solvent Polymer Content (%) Functional Group Optional
Brand X: standard (250K to 300K)
L: low (150K to 200K)
1: 100 °C/100 series for dip coating
8: 180 °C/800 series for spin coating
7% or 9% concentration of the solution A: standard
M: for adhesion to inorganic materials
E, P, P2, none
CT X 8 09 A P2
CT L 1 09 A E
CT L 8 09 M

Major Types of CYTOP™

  • Dip Coating: CTL-109AE
  • Spin Coating: CTX-809A; CTX-809AP2; CTL-809M

How to use CYTOP™

  1. AGC normally supplies a 9% solution.
  2. To achieve the thickness desired, control the concentration of the CYTOP™ solution as well as speed of coating. For this purpose, we supply the solvent at the same time as the CYTOP™ solution.

First purchase procedure

Please find below the procedures for purchasing CYTOP™ for the first time:

  1. Because there are several CYTOP grades, we need some technical information to recommend the best grade for your application.
  2. CYTOP™ is regulated by Japanese and European laws, and an export license is necessary. If you are not involved in atomic, military or chemical weapon activity, getting a license will take time but should not be a problem. However, if an export license is not granted, AGC has the right to decline your request or order.
  3. The enclosed questionnaire asks you for technical information, information needed to apply for an export license and delivery information. Please complete this questionnaire and send it back to us at your earliest convenience.
  4. For the first trial, we offer our standard package (“Starter Kit”) containing 100 g CYTOP solution + 300 g solvent.
  5. Price is dependent on the specific CYTOP grade. Please contact us at to request the price for a suitable grade and application. The price includes delivery costs to your premises, but does not include import duty and VAT (delivery term is DAP Incoterm 2010). Please note that, from 2015, the commercial conditions will change for the “only solvent order.”
  6. Standard delivery time is 4-6 weeks after receipt of your order sheet or advance payment (depending on which method is used). For the first purchase, however, the delivery time is longer because of the procedure for obtaining the export license.If you agree to the above procedure, click the button below. You will then be taken to a questionnaire. After you submit your completed questionnaire, we will proceed with filling your request. Thank you for your interest in CYTOP™.
Amorphous fluoropolymers have excellent chemical, thermal, electrical, and surface properties.
AGC Chemicals