One thing to consider is the coating house’s experience level. Developing solid procedures and processes for conformal coating take time and experience. Many new vendors claim to be able to apply conformal coating as well as the experienced guys, but fall short whenever they run into issues they do not have the experience to troubleshoot. It will be tough to get referrals from your coating house, as a lot of times they are required to sign a non-disclosure agreement. A good way to evaluate their experience level would be to ask how many years they have been in business and their typical weekly, monthly, and yearly volumes processed. A visit to their facility, if warranted by the volume of the project, should give a good indication of the seriousness of their abilities.
Parylene Coating Blog by Diamond-MT
Solvents can be used safely. However, the exposure of the operator to the solvent fumes must be REGULARLY measured and RECORDED. This ensures a safe operating environment and if an OSHA problem does arise in the future, evidence exists to rule out the conformal coating process as the culprit.
Depending on your application, choosing to use conformal coating equipment can be a very wise choice for maximum efficiency. I would recommend use of the conformal coating process decision worksheet to determine your coating needs and whether you should outsource conformal coating prior to purchasing a machine.
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.
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Conformal Coating Process – Phase 1 – Prior to Parts Arrival
Once we receive a purchase order from a customer, all of the pertinent information such as drawings, specifications, and special instructions are given to the quality department from our marketing team to create custom work instructions for that particular part. If the material to be used has not yet been determined, we work with the customer to determine the best material for their application.