temmie
Well-known member
temmie,
FPL53 is fluoride glass and it has never contained lead because lead would ruin it. I omitted the "S" prefix originally just for brevity. In the Ohara catalogue "S" has simply been added to all glass types that are made without arsenic or lead.
Henry
Well, I got misled by this post: (# 4) http://stargazerslounge.com/discussions-scopes-whole-setups/68403-fpl-53-fluorite.html
This seemed to indicate they used Lead glass at one time in history...
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