Parylene Coating Facts: A Quick Review

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Parylene Coating Facts A Quick Review
Parylene coating has been used extensively for
applications on sensitive components, circuits,
aerospace industry, electronics and medical
devices. The application method uses a vapour
deposited plastic that results in an extremely
thin yet pin-free isolative coating. Choosing
such barriers protects assemblies from standard
chemical contaminants like moisture, oxygen and
carbon dioxide. The coating is applied in
extremely thin layers using a dip, flow, spray
method or as recommended by the selected Parylene
Coating Supplier in Malaysia.

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Parylene coating can be applied to any material.
It meets the FDA and USPVI standards for Medical
devices. It also provides - Low
friction Ultra-thin application Abrasion
resistance, etc. Parylene coatings further
- Stick well to most surfaces Provides a great
interior coating Strengthens solder joints, wire
bonds, etc Minimizes ionic conductivity The low
dielectric constant tolerates high-frequency
loadings Increases the lifespan of PCB and hence
its functionality Application is stress-free The
coating is effective against fungi and a range of
solvents
 
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Types of Parylene coatings Parylene coatings are
applied in a gaseous state using a chemical
vapour deposition process. These are applied to a
variety of components, especially electrical
equipment. Opting for this deposition process
means an effective coating of crevices, internal
areas, etc. These coatings can be useful for
applications in the range of 0.1 -76 microns.
This is extremely fine when compared to other
alternatives available in the same segment. As a
result, it results in achieving -
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• A pinhole-free coverage
• High tension strain
• Homogeneous surfaces
• A low dielectric constant
• Electrical insulation
• Thermal stability between -200 to 125 Celcius,
  etc.

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• As a result, the coatings bring safety against -
• Acids
• Body fluids
• Caustic products
• Dust and temperature extreme
• Water droplets, etc.
• Therefore, these coatings are used extensively by
  automobile, military, medical, implantable
  manufacturers, etc.

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• Each type of parylene coating has distinctive
  properties and applications like
• Parylene AF4 Polymer
• The process of production of Parylene AF4
  Polymer is one of the most expensive ones among
  the Parylene manufacturing processes. It requires
  a three-step synthesis process and has specific
  applications. Since it is a PTFE analogue, it
  brings better oxidative resistance, UV
  protection, etc.
• Parylene C
• This type of coating is used for conformal
  coating. It is poly-mono choro and para-xylene
  variety derived from material C. This can be
  deposited at room temperature using Chemical
  Vapor Deposition technique.
• Type C coatings have an ideal defence against
  corrosive substances, gases and assembly
  protection. It is ideal for use in oxygen
  dominated areas and can last for a decade.

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• Parylene N
• Parylene N is a less popular variant and it
  assumes a linear format. It is extremely
  crystalline and has a carbon-hydrogen combination
  with a melting point of 420 Celsius. It also
  offers good vacuum stability. The higher
  frequency applications of this are also
  recommended due to its low dielectric constant
  and dissipation values.
• Both types C and N have a higher deposition rate
  than other forms of Parylene. These also have
  lower metal contamination and resistance against
  chemical corrosion.
• Parylene Type F
• This type of coating has a fluorine atom on an
  aromatic ring that brings low dielectric
  constant, and thermal stability and thus is
  recommended for inner layer dielectric (ILD),
  MEMs and nanotechnology applications.

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