Why use parylene?

Parylene is considered by many to be the ultimate conformal coating for the protection of devices, components and surfaces in the electronics, instrumentation, aerospace, medical and engineering industries.

  • Parylene is unique in being created directly on the surface at room temperature.
  • There is no liquid phase involved. Coatings are truly conformal, of uniform controllable thickness, and are completely pinhole-free at thicknesses greater than 0.5μ.
  • The coating completely penetrates spaces as narrow 0.01mm.
  • No initiators or catalysts are involved in the polymerisation so the coating is very pure and free from trace ionic impurities.
  • Room temperature formation means the coatings are effectively stress-free.
  • Any substrate that is vacuum-stable can be coated and the coating adheres strongly to all materials, even stainless steel, provided the appropriate adhesion-promotion techniques are used.
  • Parylenes are chemically and biologically inert and stable and make excellent barrier materials.
  • Parylenes are almost completely unaffected by solvents, have low bulk permeability and are hydrophobic. Coatings easily pass a 100hr salt-spray test.
  • Parylenes have excellent electrical properties: low dielectric constant and loss with good high-frequency properties; good dielectric strength; and high bulk and surface resistivities.
  • Parylenes have good thermal endurance: Parylene C performs in air without significant loss of physical properties for 10 years at 80°C and in the absence of oxygen to temperatures in excess of 200°C.
  • Parylenes are transparent and can be used to coat optical elements.
  • Coatings perform well as dry lubricants: static and dynamic friction coefficients are equal and comparable to fluoropolymers with the advantage that they also have good wear and abrasion resistance.
  • FDA approval of parylene-coated devices is well-documented. The coatings comply with USP Class VI Plastics requirements and are MIL-I-46058C / IPC-cc-830B listed (as class XY).

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