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Parylene Conformal Coatings

Parylene conformal coating is suitable for metals, elastomers, electronics and plastics and used extensively in the automotive, aerospace, electronics and medical industries. It is an ultra-thin film polymer coating which provides a consistent pin-hole free barrier coating to all shapes, edges, crevices and recesses with same thickness without suffering any of the edge effects of conventional coatings.

Benefits of Parylene Coating

  • Ultra-thin film – Coating thickness of less than 1µm can be applied providing sufficient lubricity and barrier protection for most silicone and rubber materials penetrating openings and features as small as 0.01mm
  • Pin-hole free barrier – Resistance to chemical attack from organic solvents, inorganic reagents, acids, oxygen and moisture
  • Uniform – Thickness tolerances are typically held to ±20% from nominal and tolerances as tight as ±5% are possible even for the most intricate and complex shapes. The process can hold thickness up to 50 microns
  • Stable – Inert and insoluble in most solvent systems within its temperature range. It is thermally stable between -200°C and 140°C
  • Dielectric strength – Extremely high dielectric strength of 5 kV/mil
  • Elasticity – Elongation and adhesion of the Parylene film with elasticity above 2x (100%)
  • Hydrophobic – Overcomes internal and external fluid build-up in silicone tubes and other components
  • Low stress process – Applied at room temperature. Any object which can be exposed to medium vacuum can be coated with Parylene
  • Dry Film Lubricant – Eliminates the need for liquid release agents
  • Optical clarity – Parylene C is optically clear
  • Sterilisation – Coated devices may be sterilized with steam, ETO (Ethylene Oxide Sterilization) or radiation
  • Biocompatible – USP Class VI approved for implantable devices

Process

Parylene conformal coatings are applied by vapor deposition under a vacuum in a coating chamber at room temperature. The Parylene coating process exposes objects to a gas-phase monomer at low pressure. Through vacuum deposition, Parylene condenses and polymerizes on the object’s surface in a polycrystalline formation. The Parylene coating grows at a rate 0.2µm – 0.3µm per minute depending on type N or C respectively.

 


Parylene C is most widely used as it has good electrical and physical properties (used for electronic application). Parylene N is selected for its high dielectric strength and where greater coating penetration is needed. Whereas Parylene F is selected for high temperature applications.
Parylene conformal coatings are normally applied using a batch process where parts are put into a chamber, either horizontal (tumbler) or vertical. The batch process offers a cost effective solution for many applications.

We offer military grade, IPC-CC-830 and USP Class VI approved dimers. The list includes GALXYL® and ConformX® dimer.  These are the key raw materials used in the Parylene coating process. We are parylene coating supplier and additionally offer commercial Parylene variants, each with its own unique electrical and physical properties. We assist and advise you to the best and most suitable variant to use for your unique product. Learn more

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