Why do I get cracks in my conformal coating during processing?
Conformal Coating cracking is a failure mechanism in processing where the smooth surface fractures into sections with the cracks in the coating leaving the area below exposed to potential contaminants.
Causes of Cracking in Conformal Coating include:
- Cure temperature too high
- Conformal coating heat cured too quickly without allowing enough time for room temperature (RT) drying
- Film thickness too great causing coefficient of thermal expansion (CTE) mismatch and cracks occurring in the coating
- Operating temperature too high or too low causing the conformal coating to flex too much & crack.
To find out more click conformal coating cracking technical bulletin.