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I have my doubts about perlite releasing fluoride. Here is a web site for
Perlite manufacturers:


According to this organization, perlite is essentially an inert silica
material (here's that silicon beast again - silica is silicon dioxide, also
known as glass, quartz, etc.) that is industrially expanded by way of a
small percentage of water in its peculiar mineral form.

Fluorine-containing materials probably way too expensive to offer as bulk
fillers. If they give off fluoride ions in any appreciable quantity they
would be better utilized as a raw material for obtaining fluorine.

Sorry to quibble, but that's what you get by having a chemist on your list.

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