Sage advice

[fivemack]

From a materials safety data sheet which I thought at first was a joke (since it was clearly referring to silicon dioxide, ie glass) - it turns out to be referring to a teflon-coated glass fibre for use in weaving linings for furnaces, which needed an MSDS since it turns into something worryingly like asbestos when strongly heated.

INCOMPATIBILITY (Materials to Avoid):

Molten alkali metals. Reacts with xenon hexafluoride to produce xenon trioxide. May react with hydrofluoric acid to produce silicon tetrafluoride gas. Avoid oxygen difluoride, chlorine trifluoride and hot phosphoric acid.

I would like to assert my heart-felt agreement with the last sentence of that paragraph.