ASYMTEK Products | Nordson Electronics Solutions | https://www.nordson.com/en/divisions/sonoscan/support/application-notes/0434-pqfp-production-scanning
. The circular gap-type defect pattern surrounding the die is typical of a popcorn crack resulting from the sudden expansion of trapped moisture
ASCEN Technology | https://www.ascen.ltd/Blog/Solutio/602.html
surface insulation resistance but will also allow any moisture trapped in the circuit board to escape. The concept of a conformal coating of electronics was originally proposed,after the conformal coating machine application more and more popular, and through research to meet the demanding requirements
ASYMTEK Products | Nordson Electronics Solutions | https://www.nordson.com/en/divisions/asymtek/your-process/applications-corner/bubbles-and-conformal-coating
Bubbles occur when solvents or air become trapped and can’t escape conformal coating material. The presence of bubbles can lead to long-term product reliability issues including bridging of conductive paths, corrosion of exposed areas, and cracked coating due to temperature changes, shock or vibration
Surface Mount Technology Association (SMTA) | https://www.smta.org/harsh/tech2018.cfm
. Marietta Lemieux of STI will present research on detection levels of ionic contamination trapped under leadless and BTC components. The data finds that the extraction time is an important consideration when qualifying and validating levels of contamination on production assemblies
: I have a question concerning ceramic CCA and their bake out after aqueous wash cycle prior to parylene coating. In theory, parylene deposition will draw off any moisture before the coating process
ASYMTEK Products | Nordson Electronics Solutions | https://www.nordson.com/en/divisions/efd/resource-center/solder-glossary-of-terms
. High Temperature Alloy Refers to a solder alloy with a solidus temperature above 230° C (446° F). See Solidus . Hygroscopic The capacity of a material or compound to absorb and retain moisture from its environment
ASYMTEK Products | Nordson Electronics Solutions | https://www.nordson.com/en/divisions/efd/resources/solder-dictionary-of-terms
. High Temperature Alloy Refers to a solder alloy with a solidus temperature above 230° C (446° F). See Solidus . Hygroscopic The capacity of a material or compound to absorb and retain moisture from its environment
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