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Removal of conformal coatings
The purpose of this trial is to find a chemistry that removes conformal coatings for Electronics Manufacturer.
4 Circuit boards were coated with the Humiseal and allowed to cure for six days. One circuitboard was cleaned with each chemistry. Cleaning time took place for 10 minutes. Rinsing was performed with DI water at 80 F for 1 minute. The circuit boards were dried under UV light for 20 minutes. The Circuit boards were then evaluated under black light.
SUBSTRATE MATERIAL: Circuit Boards
CONTAMINANTS: Humiseal 1B31
CONTAMINATING PROCESS USED: Coating applied on with a brush and allowed to set for 6 days
Positron- The Humiseal was slightly tackey after 10 minutes, non-volatile so it has to be rinsed. Rinsing would have to be performed with a solvent.
Ecolink 2005- Removed almost all of the Humiseal. Small deposits remained on the circuit boards. I believe that this is dissolved Humiseal that is deposited on the circuitboards as the Ecolink 2005 evaporates. Looks very positive Impress Wash- After 10 minutes, some of the humiseal was dissolved, the circuitboard was immersed for another 10 minutes, but removal was not increased too much. All in all, not to impressive.
NMP- Will remove the humiseal, but will have to be rinsed with another solvent. There may be some toxicity questions.
Success Rating:Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Two chemistries showed potential the Ecolink 2005 and the NMP.