Very interesting. Thanks for sharing. I always wondered how the PCB core looks like. Subscribed to channel right away.
@andyash5675
3 жыл бұрын
Watching because I had this happen using an old damp test board on a hot plate. I can tell you that the vias don't prevent production of steam. All that happens is that the steam permeates further until it can escape at the sides in a fine jet.
@medvidekkrupicka1404
3 жыл бұрын
Nice video, thanks! I am only missing the test repeated with a fresh from the package PCB and another PCB that has been soaked in the water for a couple of days and then baked at 110°C for some hours as is done with ICs in order to get the water from their casing resin before soldering. Nevertheless, very informative experiment.
@SpinStar1956
3 жыл бұрын
Pretty extreme testing but interesting non the less. You can use super-thin (watery) CA glue; it will both wick-in an seal the edges.
@mamun9979
3 жыл бұрын
Super experiment 😇
@alexanderthrasher923
3 жыл бұрын
Does delamination occur at lower temperatures between layers? I noticed that sort of flaking @ 1:00 (Top left window) and wondered if the F4 did the same thing, or if the fiberglass weave helps keep dual layer PCBs from breaking internal connections. The moisture lab was really informative, thank you.
@WizardTim
3 жыл бұрын
Delamination is unlikely on an FR-4 PCB unless there is extreme moisture as shown in the video, on phenolic resin bonded paper FR-2 it’s much more likely even with lower temperatures and zero absorbed moisture. However, FR-4 will still be damaged at lower temperatures just not in the same was as FR-2 and nowhere near as quickly. FR-4 uses an epoxy resin binder to hold the fibreglass weave together and with all epoxies it suffers from the limitations of the glass transition temperature (Tg). The board shown in this video has a Tg between 130 °C and 140 °C where the epoxy will become soft and degrade after long expose (you’ll see this as a discoloured PCB around hot components on old boards). If you have components that are likely to heat up your PCB to or above the Tg you should get a higher Tg PCB, however this is of course more expensive.
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