Parylene Coating

Parylene Advantages of diX Coatings

Advantages of diX Coating

diX C

Useful combination of physical, electrical and chemical properties.
MIL-SPEC. I-46058C Approved and UL94 V-0 Approved.

diX N

Non-halogen. Good for medical applications.
High electrical properties.

  • diX C and diX N Parylene coating materials are very high in purity-above 99%. High purity eliminates residue and stains in coating machines, doesn’t cause offensive odors due to decomposition of impurities and has high gas barrier properties.
  • Coating thickness of the material ranges from the micron range to millimeters while maintaining a perfectly uniform, clear thin coating.
  • Applied in a non-liquid form, which creates a thin uniform coating that is pinhole free. A non-liquid coating eliminates sagging, bridging between surfaces, puddling and pinholes.
  • High resistance to chemical solvents and moisture creating a coating that can withstand harsh conditions.
  • Covers all surfaces left exposed allowing coating of hard to reach places that would otherwise provide enormous obstacles with other coating materials.
  • Optical Clarity-diX Parylene coating material is a transparent, colorless film ideal for optical applications

Coating Process of Parylene Dimer-Gas Phase Deposition

The products to be coated must first be cleaned and masked and are then placed in the deposition chamber. One important fact about parylene coating and the reason it is so advantageous is that the coating applications are done at room temperature. Next, dimer is then placed in a glass tube in an aluminum foil cup called a “boat”.

The process then begins when an end cap is placed over the glass tube. Dimer is then changed from a solid into a vaporized gas because of reduced pressure at the other end causing the molecules to move down the tube. In the pyrolysis zone, the gas is heated to higher temperatures (680oC) and then cleaved into the reactive monomer, para-xlylyene, which is critical for the process. The monomer molecules then enter the deposition chamber and re-form as a long-chain polymer on all exposed surfaces.

Film growth then continues in the deposition chamber creating a coating surface that is pinhole free and is able to reach the deepest crevices and the sharpest edges in uniform manner.

A cold trap is used between the deposition chamber and the vacuum pump to prevent parylene molecules that did not deposit in the chamber from reaching the vacuum pump. It also prevents “backstreaming” of oil molecules into the deposition chamber.