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Photolysis

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

Techniques

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Benefits

Benefits of Surface Modification:

  • Uniform 3-D treatment   
  • Chemistry control                   
  • Longer lifespan
  • Roll-to-roll capability
  • Corrosion-resistance
  • Bondable
  • Inert surface

Applications

Common Industry Applications

Medical

  • Plasma-cleaning
  • Devices including catheters, endoscopes, stents, intra-ocular lenses, etc. prior to the application of a specialty and/or lubricious coating, adhesive, or marking.

Optical

  • Plasma-cleaning and/or photolysis treatments 
  • Materials including polycarbonate, glass, CR39, TrivexTM, PMMA, and urethane, for lenses, films, depositions, MOEMs.

Pharmaceutical 

  • Devices for drug delivery and storage

Biotechnology

  • Plasma-cleaning, functionalization and silane deposition treatments 
  • Micro-arrays, micro-fluidics, MEMs, etc.

Aerospace, Automotive and Commercial Products

  • Improve the adhesion of gaskets and other dissimilar materials, remove "tack" from silicon devices, and increase adhesion of elastomer material to metal, polymers and other elastomers

Education

Complete our Surface Modification Application Worksheet

For more surface modification technical information:

Techniques

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