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Practical application case of Parylene coating thickness measurement

2026-06-27 16:45:51 admin

Practical application case of Parylene coating thickness measurement

Younikon Technology Co., Ltd

catalogue


01	What is Parylene
02	The History of Parylene
03	Advantages of Parylene
04	Types of Parylene
05	Application of Parylene
06	Parylene measurement monitoring and solution

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What is Parylene

What is Parylene

Parylene is a polymer material made by an American companyUnion Carbide Co. developed applications in the one thousand nine hundred and sixtys.

Parylene is prepared using a unique vacuum vapor deposition process, in which active small molecules "grow" onto the substrate surface to form a fully conformal polymer film coating. It can be applied to surfaces of various shapes, including sharp edges, cracks, and inner surfaces, and is known as "ubiquitous".

Parylene has performance advantages that other coatings cannot match.

Parylene is also considered a "green" polymer because its polymerization does not require initiators or other chemicals to terminate the chain; And the coating can be applied at or near room temperature without any solvents.

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The History of Parylene

History of Parylene

one thousand nine hundred and forty-seven

Parylene Discovered by Michael Szwarc.

one thousand nine hundred and sixty-five

William F. Gorham of Union Carbide discovered a more efficient route. He deposited parylene films by thermal decomposition of cyclohexane at temperatures exceeding 550 ° C and in a vacuum below 1 Torr. This process does not require solvents and produces a chemical resistant film without pinholes. Union Carbide commercialized the parylene coating system in 1965.

1960

Union Carbide continues to study the synthesis of various precursors of parylene, including parylene AF-4. Union Carbide acquired NovaTran in 1984 and merged it with other electronic chemical coating businesses to form the Specialty Coating Systems division. This department was sold to Cookson Electronics in 1994.

Advantages of Parylene

Advantages of Parylene

Parylene can endow coated components with several ideal qualities

Hydrophobicity, chemical resistance, and resistance to gases (including water vapor)

Almost impermeable to inorganic and organic liquids (including strong acids and bases).

A good electrical insulator with low dielectric constant

Stable in biological tissues and approved by the US FDA for various medical applications.

Resistant to extreme cold (minus 200 degrees)

Low friction coefficient (AF-4, HT, SF)

By using Parylene for coating, a uniform, transparent, and thin film layer can be obtained

Can be applied to surfaces of various shapes, including sharp edges and cracks

Economically clean, simple process, fast speed, strong batch processing capability

Due to the coating process being carried out in ambient temperature and mild vacuum, it can even be applied to temperature sensitive objects, such as dry biological specimens. Low temperature also leads to low intrinsic stress in the film. In addition, the gas in the sedimentation chamber is a monomer, without any solvents, catalysts, or by-products that may harm the object.

Types of Parylene

Types of Parylene

Parylene is a polymer of para xylene, which can be classified into various types such as N, C, D, etc. based on its molecular structure.

	Parylene N-type
tutorial	Parylene N-type is an excellent dielectric material with very low dielectric loss, high insulation strength, and a dielectric constant that does not vary with frequency. Parylene N-type is one of the most penetrating types of Parylene, with excellent self-lubricating properties and a friction coefficient of 0.25.

	Parylene C-type
tutorial	Parylene C-type is a commercially valuable member of the series. It is made from the same monomer, except that one aromatic hydrocarbon hydrogen atom is replaced with a chlorine atom. Parylene C-type combines excellent dielectric and physical mechanical properties, with low permeability to humid and corrosive gases. Can provide true pinhole free overlay isolation.

	Parylene D-type
	Parylene D-type is the third member in the series. It is made from the same monomer, except that two aromatic hydrocarbon hydrogen atoms are replaced by chlorine atoms. The properties of Parylene D-type are similar to those of Parylene C-type, but they have higher heat resistance. It is higher. It still has excellent dielectric and physical mechanical properties at temperature.

Application of Parylene

Application of Parylene

Parylene C is used for coating printed circuit boards (PCBs) and medical devices. There are many other applications as Parylene is a good moisture-proof layer. It is a highly biocompatible coating that can be used for permanent implantation of stents, defibrillators, pacemakers, and other devices.

Parylene coatings are also commonly used as electrical insulation, moisture-proof layers, or corrosion and chemical corrosion protection for electronic circuits and other devices. They are also used to reduce friction. These coatings are typically applied by chemical vapor deposition in an atmosphere of monomer xylene.

Typical Applications
Hydrophobic coating (moisture-proof layer, such as used for biomedical hoses)
Barrier layer (e.g. used for filters, diaphragms, valves)
Microwave electronic devices (e.g. protecting PTFE dielectric substrates from oil contamination)
implantable medical device
Sensors in harsh environments (e.g. automotive fuel/air sensors)
Used for space travel and electronic products
Corrosion protection of metal surfaces
Strengthening microstructure
Protect plastics, rubber, etc. from harmful environmental conditions
Reduce friction, such as for guiding catheter, acupuncture and moxibustion needle and MEMS.
....

Silicone Parylene

Parylene circuit board

Silicone Parylene coating

Parylene rotor motor

Parylene magnetic core

Parylene electronic components

Parylene measurement monitoring and solution

Parylene Monitoring

Due to the close relationship between the performance characteristics of Parylene coatings and their coating thickness, the coating thickness needs to be strictly controlled and monitored in real-time during the "growth" process of Parylene coatings.

Due to the "growth" of Parylene coating on the surface of the product, some applications that require the appearance of the product also have strict requirements for the transmittance of the coating. So specialized equipment is also needed for quality control and production monitoring.

Match product model

F20 / F32
Filmetrics film thickness gauge F20 model/ F32 modelAs a high-performance device with high precision, fast testing speed, and easy operation, it can conveniently and quickly measure the thickness and transmittance of Parylene coatings simultaneously.

Product Features
Measurement results can be obtained within seconds
Can measure film thickness from 1nm to 10mm
Can measure thickness, refractive index, reflectivity, and transmittance

measurement results

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article author

	Chen Xianliang Technical Service Manager Deeply rooted in the semiconductor field and thin film measurement industry for nearly 20 years, Have a clear theoretical understanding of the overall process of semiconductor technology, I have rich measurement experience in the application of thin films of compound materials, Strong ability to handle unexpected issues during device operation.
Technology is an attitude, service is a belief.

We have been deeply involved in the thin film measurement industry for over ten years. No matter what problems you have in thin film measurement, our technical experts can provide you with valuable advice or solutions. Welcome to call, we are pleased to discuss your application issues with you.

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