What is PCB Surface Energy and How Does It Affect Conformal Coating

https://chasecorp.com/HumiSeal/ recommends a minimum surface energy of 38 dynes or more measured immediately preceding the conformal coating station. Unfortunately, there are many processes prior to conformal coating that will cause a reduction in the surface energy of a PCB. Most of these conditions are caused by the deposition or migration of low surface energy contaminants to the PCB such as oils, waxes, or plasticizing agentsSimple handling, transportation, and reflow process all add ionic and non-ionic contaminants. Develop stage-gate surface energy checks between each step in the SMT process to determine where the surface energy is affected. Once identified, put in proper corrective actions to address the source of any type of contaminants.