Water decomposes into oxygen and hydrofluoric acid. All organic matter
(earth type) converts into oxygen, carbon tetrafluoride, hydrofluoric
acid, etc., with more or less speed. A rubber gas mask lasts about an
hour. Glass first frosts and then disappears. Plastics act like
rubber, only a little slower. The heavy metals, iron, nickel, copper,
monel, etc., stand up well, forming an insoluble coat of fluorides at
first and then doing nothing else.