In article ,
Harry Bloomfield writes:
It happens that Steve Walker formulated :

Some double glazing units are Argon filled.

But would this (what I would assume to be an old panel) be argon
filled. It is old and the OP is just wanting to prolong its useful life
a little longer.

Any original filling has been lost and replaced by air many
times over long before the condensation became visible.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]