Parylene Coating Blog by Diamond-MT

How Parylene Cost is Determined

Posted by Sean Horn on Mon, Apr 16, 2012 @ 03:34 PM

Parylene is often priced out to be one of the more expensive conformal coating options.  After a quick look at some of the cost factors, it will be easy to see why.  Three of the main factors that influence parylene cost are raw materials, labor, and lot volume. 

 Raw Materials – Parylene Dimer and Adhesion Promotion

 Parylene dimer is the raw form of parylene.  It is the solid inserted into the machine that is broken down through the deposition process.  Cost for parylene dimer can be anywhere from $200 to $5,000 per pound depending on the different type of dimer.  A typical coating run is around a pound of dimer.

 Different adhesion promotion methods require different raw materials.  From various board cleaning solutions to A-174 silane, these raw material costs need to be added to the price per assembly.  There is not much that can be done with these costs, as adhesion is the name of the game in parylene.   

Parylene Labor Costs

 Like all conformal coatings, masking is usually the most labor intensive part of the process.  However, parylene is different from other conformal coatings in that it is applied in a gaseous state through a vapor deposition process.  The parylene molecules will penetrate anywhere that air can.  As a result, great care needs to be taken during the masking process to ensure that every connector is adequately sealed and all tape is firmly pressed against the coating keep-out areas.

 Another factor that will result in increased labor costs is the increased time spent per board to increase parylene adhesion.  Spending extra time cleaning products and applying different adhesion promotion mediums will result in increased labor times.

 Parylene Lot Volumes

 Items to be parylene coated are placed into a vacuum chamber.  There is finite space available in the chamber and everything inside gets coated.  In order to get the lowest cost, we have to maximize the products in the chamber.  If we are able to divide the material costs among a greater number of boards, the cost per board drastically drops. 

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Tags: parylene, parylene cost, parylene process, parylene deposition, parylene dimer, conformal coating process, conformal coating methods, conformal coating service, parylene adhesion, parylene coating service, conformal coating costs