Transparent amorphous fluoropolymer coatings protect sensitive electronics and optics components and transmit light

Transparent amorphous fluoropolymer coatings protect sensitive electronics and optics components and transmit light

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Components inside equipment can deteriorate when exposed to contaminants and moisture. This corrosion can reduce electronic performance and lead to electrical shorts and device failure. Manufacturers use special coatings to protect these sensitive components.

Factors to consider when selecting a coating material for electronics are the service environment, the life span of the component, and the cost of the coating.

There is a wide range of coating options. However, many of them are not suitable for optical products and other electronics that require absolute illumination to function optimally. Optics specifically require coatings that are both protective and allow maximum light transmission. This ensures better image sharpness and contrast

AF polymer coatings perform like transparent PTFE

Conventional fluoropolymers, such as PTFE (polytetrafluoroethylene) resins, offer strength, durability, heat and chemical resistance, and high-performance electrical insulation. These features help to extend the lifetime of components and improve their fire safety. However, they are not transparent.

The development of AGC’s transparent amorphous fluoropolymer (termed CYTOP™) offers new options for many industries, notably electronics and optics. They can withstand harsh environmental conditions, so are ideal for coating electronic components such as circuit boards.

Its amorphous structure is completely different from other fluoropolymers. It is a unique molecular structure consisting of non-crystalline fluoropolymer particles dispersed in a special fluorinated solvent.

CYTOP coatings have all the performance advantages of PTFE, but they are transparent, with a visible light transmission ratio of over 95%. This enables manufacturers to create thin film coatings that produce anti-reflective properties on optical components for glasses, photo masks and optical fibers, for example.

Most fluoropolymers are insoluble, so they have to go through a baking process to adhere to the substrate. CYTOP terminates this process. CYTOP has a high solubility rate and can be dissolved in a special fluorocarbon solvent. This makes it easy to coat it on the substrate and enables users to customize the thickness of the coating depending on the amount of solvent used. CYTOP can be used in thin film coatings up to a thickness of a few sub-microns.

CYTOP fluoropolymers can be used to coat a wide variety of applications including:

  • optical fibers
  • graded-index optical fiber
  • Interlayer Dielectric Layers for Semiconductors
  • pelicles
  • protective coating for semiconductors
  • Non-autofluorescence hydrophobic coating of microfluidics
  • Hydrophobic coating of electrowetting equipment
  • Antifouling Coatings for Photomask
  • optical film
  • anti-reflective display
  • insulation material for performance

type of cytope

CYTOP is available in three variants that are suitable for different applications. Each has a unique functional group at both ends of the polymer.

write a

Metal and glass are coated with this type of CYTOP using a silane coupling agent. Type A is used with a special primer to coat the plastic. It is transparent to visible light, therefore ideal for use on anti-reflection film and optical membranes. It also acts as a water and oil repellent and an electrical insulator.

type m

This type is used in one-step coating processes for metals and glass. It is used as a protective layer, a water and oil repellent or an electrical insulator.

type s

This type exhibits high transparency for a wide range of light, from visible to ultraviolet (UV). It provides a very tough UV resistance as well as resistance to adhesion. This type is ideal for coating pellicles and optical materials, and can be used to facilitate mold release.

Coating Methods

The CYTOP coating technology depends on the base material, size and expected thickness of the coating. Three methods can be used:

  • spin coating To coat flat and rounded boards.
  • inner cover Used to coat any type of board.
  • potting method To coat any type of board.

For more information and assistance choosing the right CYTOP transparent amorphous fluoropolymer for your specific application, please visit or call 800-424-7833 .

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