Abstract
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Visual artifact
A charred hole is found at a high current (High ≥ 1 A) connector location.
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Evaluation
In order to entirely burn away PCB base material a very intense arcing environment for ~1 min is required. For a 1.574 mm thick FR4 laminate this can occur with 39 J for 9 s to ignite and 47 J to sustain a flame for 11 s. This flame is capable of carbonizing the material that can fall out and leave a hole. For a 1.574 mm thick CEM-1 laminate this can occur with 27 J for 6 s to ignite and 157 J to sustain a flame for 35 s that is capable of carbonizing the material that can fall out an leave a hole. See experiments #5, #9a and #9b of Chap. 14 for comparative details.
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Small, J.E. (2017). Localized Event Explained—Charred Hole. In: Electronic Control Fires. SpringerBriefs in Fire. Springer, Cham. https://doi.org/10.1007/978-3-319-52845-8_9
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DOI: https://doi.org/10.1007/978-3-319-52845-8_9
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