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Parylene conformal coating is an ultra-thin film polymer coating that provides a uniform pin-hole-free barrier coating to all shapes, edges, crevices, and recesses with the same thickness without suffering any of the edge effects of conventional coatings.
Parylene coatings are highly lubricious, dry film and environmentally protective conformal coatings applied to metals, elastomers, electronics, glass, ceramics and plastics. Our coating services provide the very best thin film conformal coating protection for critical components in many industries including Medical Device, Aerospace, Defence, Automotive and Electronics.
Parylene is considered by many to be the very best thin film conformal coating for environmental protection particularly in high reliability applications.
It is the coating of choice to ruggedize critical electronics, devices and subassemblies in industries such as Aerospace, Defence and Medical.
Parylene provides protection from moisture, corrosive bodily fluids, chemicals, gases, temperature and fungus far surpassing the protective properties of most other conformal coatings.
Solves dry friction
Parylene is a highly lubricous dry film coating.
Parylene N has a low co-efficient of friction of 0.25 static and dynamic between 2.5 – 6µm.
Being particulate free and bio compatible, it is the favoured dry film lubricant for release-ability of manufacturing aids for medical device manufacture.
For elastomeric applications Parylene is used to remove tackiness from the substrate at coating thicknesses as low as 1500Å.
For medical devices requiring biomedical compatibility and barrier protection against biofluids, moisture and chemicals.
Also acts as a dry film lubricant with a coefficient of friction measurement that approaches that of TEFLON®.
Parylene type N is typically used in applications requiring this type of releasability or dry film lubricant.
Even and consistent barrier coating which does not pull away from the edges or exhibit meniscus forces.
Excellent dielectric strength.
Resistant to humidity and practically insoluble in all known organic and inorganic solvents including acid and alkali.
Elimination of abrasion damage to the wire along with uniform coating thickness
Maximum winding window.
Low water vapour transmission provides excellent corrosion protection.
Eliminates magnetostrictive or permeability problems.
Conforms to surface features including internal dimensions of holes.
Strong surface adhesion and elasticity.
Removes elastomer tack and protect against dirt, oils, petrochemicals and solvents.
Protects printed legends from wear.
While there have been many types of Parylene researched and developed over the past 40 plus years, Parylene N and C have the widest commercial use. Each has its own unique electrical and physical properties.
Parylene conformal coatings are normally applied using a batch process where parts are put into a chamber, either horizontal (tumbler) or vertical. The batch process offers a cost-effective solution for many applications.
Type N or Natural, has the highest dielectric strength of these two commercial versions, and a dielectric constant value independent of frequency. It is able to penetrate crevices more effectively than type C because of the higher level of molecular activity that occurs during deposition. Parylene N is commonly used where lubricity is most needed and for high frequency electrical applications because of its low dissipation and dielectric constant values.
Parylene C differs chemically from N, having a chlorine atom on the benzene ring that results in a useful combination of electrical and physical properties including particularly low moisture and gas permeability. Parylene C deposits on substrates at a faster rate than Parylene N, and has a lower throw capability and an associated reduction in crevice penetration activity. Parylene C is commonly used for environmental protection.
For applications operating continuously in air temperatures greater than 125°C other variants are available. However, the deposition rates for these higher temperature capability variants are significantly slower than those for Parylene N or C and the cost of application will increase proportionally. For the majority of commercial applications, Parylene N or C will be the logical choice. However, in some cases an alternative variant may be more appropriate. We can advise on the best route on specific projects once the end use requirements are assessed.
Parylene raw materials are called dimers. CWST offers IPC-CC-830 and USP Class VI approved Parylene dimers. These are the key raw materials used in the Parylene coating process. The most common types of commercial parylene raw material or dimers are Dimer C and Dimer N. Read More >>