Parylene Coating

Parylene is the generic name used to describe a family of polymers based on polyxylene.  It is a conformal coating applied in thin layers (typically a few mills or fractions of a mm) through dipping, spraying or simple flow coating.
 
Parylene is formed through a pyrolisis of a dimer.  The dimer is introduced into a vacuum change and is converted to a reactive vapor.  This is done at very high temperatures with the resulting material being in a monomer form.  As the monomer is passed over room temperature objects, the vapor rapidly coats the material with the polymer.  

Advantages

• Provides a barrier against leaching or blooming of elastomer bi-products 
• Improves lubricity thus reducing friction 
• Reduces surface tack and stickiness
• Prevents flaking or dusting of surface
• Resists abrasion damage, chemicals and solvents
• Strengthens molded plastic magnetic components
• Guarantees a uniform and ultra thin surface
• Has little known effect on the shape or capacity of the coil form allowing for close tolerance design
• Biocompatible
• Moisture resistant
• Excellent thermal properties for high temperature, high performance circuit boards
• Rugged

Learn more about other Surface Modification techniques:

• Plasma
• Corona
• Photolysis