Different Compositions of Parylene and their Characteristics

Different Compositions of Parylene and their Characteristics

1.) Parylene N

Parylene N consists of a linear carbon-hydrogen molecule structure. It’s the most fundamental, basic form of Parylene, which makes it suitable for devices that see high-frequency use. This type is distinguished by its vacuum stability and low dielectric constant.

When going through the deposition process, Parylene N —along with Parylene C — has a higher deposition rate than many other types. This quality makes it convenient for commercial use, although it’s not quite as widespread as Parylene C. Parylene N is also halogen-free. Halogens include elements like fluorine, bromine and chlorine. This quality generally makes Parylene N preferable to Parylene C, as some industries require the Parylene coatings they employ to be halogen-free.

For example, halogens in electronics can bio-accumulate within living beings, and they can be toxic to the environment when burned.

The most common applications for this Parylene coating include the following:

• Printed circuit boards: Most Parylene types protect the delicate inner workings of complex circuitry.

• Elastomers: Manufacturers use Parylene N to coat elastomers, polymers with weak molecular forces.

• Electronics: Most types of this material are excellent for protecting electronic devices, whether medical or non-medical.

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2.) Parylene C

The moisture-resistant Parylene C is similar to Parylene N in that it contains a carbon-hydrogen molecule structure. However, for each molecule, it possesses one chlorine atom in place of a hydrogen atom.

As a conformal coating, Parylene C provides a protective barrier for printed circuit boards. Parylene C also offers excellent protection against corrosive substances due to its low permeability. Like other types, Parylene C is added to a substrate using the chemical vapor deposition process.

If you have a device that needs high levels of protection, Parylene C is one of the best coatings available. Here’s where you’ll often see it being used:

• Medical Devices: Parylene C has been used in previous medical device studies as a substrate for peripheral nerve electrodes. A nerve electrode connects neurons to a brain-machine interface (BMI) and records nerve signals.

• Microelectromechanical Systems devices (MEMs): Parylene C is often used to coat MEMs devices, though it can also serve as a structural or substrate material.

• Caustic environments: Devices that experience constant exposure to caustic substances fare better with a Parylene C coating because of the CVD process, which enables pinhole-free Parylene barriers.

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3.) Parylene F

Parylene F doesn’t see the same commercial use as the other types on this list. However, it still possesses desirable qualities, such as a low dielectric constant and great thermal stability. It also allows for a higher coating density when used in various applications. 

This Parylene coating is characterised by its fluorination due to having fluorine atoms in its aromatic ring.

Although it’s not widespread yet, its properties can serve well for things such as:

• Field-effect transistors: One study showed that Parylene C and F were used within field-effect transistors to produce copolymer gate dielectrics. The study’s results showed that Parylene copolymer dielectrics offered stable and high-quality performance without the need for extra manufacturing steps.

• Microelectromechanical systems devices (MEMs): Like Parylene C, the F type also lends itself well to MEMS — especially those with high temperature requirements.

• Harsh conditions: Parylene F exhibits resistance to high temperatures and ultraviolet (UV) radiation. Because of these properties, it could serve as a suitable substitute for Parylene C under harsh conditions.

4.) Parylene D

Parylene D resembles Parylene C in that it substitutes two hydrogen atoms for two chlorine. Both of these materials come from the same root monomer. Parylene D, however, lacks the same ease of use that C does — especially in terms of biocompatibility. It can hold up well when exposed to high temperatures, but it doesn’t work as effectively for coating things like medical devices.

However, it’s still suitable for other industrial uses. Some standard applications include:

• Aerospace components

• Electrical components

5.) Parylene HT

This type of parylene dimer is used for applications that require a low dielectric constant and excellent UV resistance. It is commonly used in the aerospace industry for its ability to withstand harsh environmental conditions.

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