David Billington fired this volley in news:mbtho2$1as$1
@dont-email.me:

Comments online I noted say that
failures of vacuum chambers are rarely spectacular when they collapse
but then the comments were about ductile materials such as steel which
just crumple.


And so does 'fresh' PVC. I wouldn't bet on the results with 10-year-old
stuff the plasticizers had gassed out of.. G

LLoyd