Parylene N vs. C vs. F (VT-4) | Overview of Parylene Types
Parylene (poly para xylylene) is a polymeric material that, when applied to substrates, creates more reliable electronics due to its strong barrier, dielectric, electrical insulation, and chemical and corrosion resistance properties. Compared to conventional conformal coating materials, Parylene can enhance reliability at thinner film layers (~2 to 25 microns).
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Due to the crevice penetrating chemical vapor deposition process, Parylene coatings are pinhole-free with excellent conformality. This defect-free coating process is unique to Parylene conformal coatings and enhances the deposited film’s chemical resistance.
Additionally, Parylene is optically transparent, and there are no initiators or catalysts in the polymerization process, so the coating is free from trace ionic impurities. It is also REACH, RoHS, PFOA/PFOS-free, and CA Prop 65 compliant. Other properties include high tensile strength and high bulk and surface resistance.
Read more about Parylene C’s Properties
Parylene comes in several varieties, each with unique properties. Types of Parylene include:
- Parylene C – This is the most widely used type of Parylene. With the lowest permeability to moisture and gas of the Parylenes, it is most suitable for substrates that will be exposed to corrosive environments.
- Parylene F-VT-4 – An excellent dielectric with very low friction coefficient and highly crystalline, Parylene F (VT-4) is a good choice for applications that entail elevated temperatures.
- Parylene N – Parylene N is an excellent dielectric and halogen-free, making it suitable for applications where sustainability has been prioritized.
Read more about Parylene N’s Properties
Selecting the proper Parylene type is critical to ensure that application requirements can be satisfied. For example, Parylene C provides the best barrier compared to other Parylene types. Meanwhile, Parylene N is halogen-free and has high barrier protection against corrosive chemicals and gases while maintaining low moisture permeability. It also has a higher dielectric strength than Parylene C. Parylene VT-4 offers higher resistance to heat than Parylenes C and N. The table below illustrates the detailed advantages of these Parylene types.
If you have decided Parylene is a good fit for your project but need help determining which type is best for your application, reach out to us today to arrange an appointment with our Applications Engineering team.
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