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Old 6th Oct 2017, 12:55 am   #36
emeritus
Dekatron
 
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 5,316
Default Re: 'Cable Break In' - I never knew that!

At Plessey we were taught that Avionics stuff was generally built in hermetically sealed boxes to ensure reliable operation in a non-pressurised environment at high altitudes where the low pressure would give rise to flashover of high voltage circuits. PTFE wire was essential in hermetically sealed containers as the Chlorine/Hydrochloric vapours given off by PVC will build up and eventually attack and dissolve plastics such as polystyrene, with deadly effects on capacitors etc. In non-pressurised equipment, these corrosive vapours can safely disperse without causing damage.
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