On: Reverse-engineering the Apollo spacecraft's FM rad...

[iasay]

They did. Just not in aerospace until the mid 1960s when decent quality fibreglass (FR4) boards were available. The previous SRBP and Bakelite boards were fragile and/or hygroscopic.

[jaytaylor → iasay]

Hygroscopic, an interesting new word to me! Thank you :)

> hy·gro·scop·ic

> adjective

> (of a substance) tending to absorb moisture from the air. relating to humidity or its measurement.

[Doxin → jaytaylor]

compare: hydrophobic