Frequently Asked Questions About Parylene Conformal Coating
What is Parylene?
Parylene is the generic name for a polymer series based on Poly-para-xylylene. Applied by vapour deposition process at room temperature this unique polymer creates an ultra-thin film highly lubricious and protective conformal coating.
Parylene coatings conform to MIL-I-46058 Type XY, IPC-CC-830B and USP Class VI, and ISO 10993 approved for use as a medical biocompatible and implantable material.
What does parylene coating do?
Parylene ruggedizes electronic components and assemblies. It has excellent diametric strength, suppresses tin whisker growth, and significantly improves lead-free solder joint life. Chemically inert, ROHAS, and reach compliant, it encapsulates the product with a protective barrier, repelling corrosive chemicals, gases, moisture, and liquid.
Is the parylene coating conformal?
Stable for any substrate stable in a partial vacuum environment, regardless of the topography of the substrate, purity of the dimer, the deposition process ensures a truly conformal coating.
What are the benefits of Parylene coatings?
Parylene removes the tackiness of elastomeric parts without adding weight or materially affecting the substrate’s elasticity. Sealing porosity, elastomers coated with parylene benefit from its low coefficient of friction, in addition to its biocompatible and environmentally protected layer.
Are there different types of Parylene?
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.
What is the typical coating thickness?
Typical coating thickness for lubricity of metal and plastic substrates is 3 to 5µm, while for silicone and rubber components 1 µm will significantly reduce tackiness.
For chemical and moisture protection printed circuit boards and medical devices these are typically coated 6 to 25 µm depending on the specific purpose required.
Does CW dimer for Parylene coatings differ from other dimer available on the market?
Yes. CW dimer differs in purity. Our proprietary dimers are over 99.7% pure. Industry standard dimers are in the 93% range. The higher purity ensures a higher yielding dimer and a Parylene coating that is clearer and more consistent in conformance to the substrate.
Is parylene coating safe for the environment?
Parylene is green chemistry, it produces no cut forces, no thermal stresses, or leachable ingredients.
Can electronics be coated with parylene?
Parylene is the coating of choice for high-reliability electronics.
Can parylene be used for coating medical devices?
For medical device manufacturing aids and delivery systems, parylene is used extensively to provide particulate-free bio-compatible dry-film lubricity.
