What is a Parylene Dimer?

Posted by Advanced Coating on Dec 16, 2019 2:22:54 PM

chemical-conceptAlthough parylene is one of the strongest and most reliable conformal coatings available, it is not necessarily "one size fits all." Read on to learn more about using a dimer for parylene--and how to know exactly what your unique project needs.

Three Common Types of Parylene Dimers

Parylene dimer is, essentially, a "raw" ingredient. Unlike parylene in its more familiar states, a dimer exists in solid form and is later transformed into a gas through chemical vapor deposition (CVD). Parylene dimer is therefore used as a sort of the first step toward whatever specific requirements your project demands. For example, the type of parylene dimer you choose will impact the resulting characteristics of your coating, like thickness, strength, and flexibility.

With this information in mind, it becomes even more critical to understand the differences between dimer types so that you can decide which one may be right for your needs.

Here are three common dimer types and their unique characteristics:

Parylene N

  • Most basic dimer type
  • Can function under extreme circumstances, including high temperatures and absent oxygen
  • Most reliable for complicated projects with crevices, small spaces, or unusual shapes

Parylene C

  • Most common dimer type used in parylene projects
  • Highly resistant to potentially corrosive chemicals, gases, and vapors
  • Known for its protective properties, especially against moisture
  • Biocompatible

Parylene D

  • More thermally stable than any other dimer
  • Remains strong under extreme circumstances
  • Doesn't conform as easily or cleanly to complicated surfaces

This was just a quick overview of parylene coating and different dimer types. For more information or help with your parylene project, contact us today!

Topics: Parylene Conformal Coating, Parylene, Parylene Coating Reference