What's Parylene

Parylene is the generic name for the poly-para-xylylenes.These Parylene materials form linear, highly-crystalline polymers but can be usefully produced only as coatings and films. The most commonly used is Parylene C, the mono-chloro substituted compound. Parylene N, the un-substituted compound, has better high-frequency dielectric properties, better penetrating power for coating the bore of very small diameter tubes, and is often preferred in medical applications. Parylene D, the di-chloro-substituted compound, has better high temperature endurance. The Parylene Coating Process The Parylene process is unique in coating technology and is best described as a vapor deposition polymerization. It is carried out under vacuum and requires specialized equipment. 1. The process begins with sublimation at about 150°C of the high purity crystalline dimer di-p-xylylene. 2. The vapor is pyrolised at about 650°C to form the gaseous monomer which has an olefinic structure.

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