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Description of Parylene |
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Parylene is a common generic name for a unique series of polymers based on paraxylene. The three most common types of parylene are referred to as: Parylene N, Parylene C, and Parylene D. In actual usage, Parylene C is the greatly predominant type of parylene used for almost all types of applications and as such is usually the type of material associated as "Parylene." The basis for the parylene family is the polyp-xylene monomer which comprises Parylene N. Parylene C and D are created by the substitution of a single chlorine molecule (C) or two (double) chlorine molecules (D). See Figure 1.
Figure 1 |
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Parylene C The most widely used dimer, providing a useful combination of properties, plus a very low permeability to moisture, chemicals, and other corrosive gases. |
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Parylene N Provides high dielectric strength and a dielectric constant that does not vary with changes in frequency. Best selection where greater coating protection is required. |
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Parylene D Maintains its physical strength and electrical properties at higher temperatures. |
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The parylenes are formed by the pyrolysis of a di-p-xylene (dimer) in a vacuum environment which is then deposited on a cooler (i.e. room temperature) substrate under continuous vacuum. Vapor phase deposition of the parylene polymer allows it to be formed as a structurally continuous film which is truly conformal to the design and structure of the substrate upon which it is being deposited. Parylene can be effectively deposited with excellent accuracy in the thickness range of 0.1 mils to over 2 mils. |
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