This initial fluoride absorption is followed by a lower and more controlled diffusion stemming from the coverage of calcium fluoride
on the surface of the enamel [Hicks, 1986].
It is NOT natural calcium fluoride
, and the FDA has NEVER approved any synthetic fluorides for human ingestion.
In a separate experiment, fully cured FA-CPC3 (formulation with the highest F content) samples were analyzed using the KOH extraction method of Caslavska (11) for the amounts of F present in the sample in two possible forms: (1) F incorporated into the apatite crystal structure and (2) F present in the form of calcium fluoride
Paton Electric Welding Institute, show that the flux for ESR of titanium can consist of special purity refractory fluorides of alkali-earth metals: calcium fluoride
, strontium fluoride and barium fluoride , and also the fluorides of rare-earth metals (FREM) based on La[F.
The mineral is calcium fluoride
, coloured by films of oils deposited on the crystals over millennia.
However, the influence of an additional inorganic particle on the foaming behavior was investigated by adding calcium fluoride
particles in amounts of 5 and 10 wt% to the FEP 2 melt containing the chemical blowing agent.
On a disk of calcium fluoride
, the engineers cut a series of concentric, reflective surfaces that bend and focus the light as it is bounced to a facing flat reflector.
The new tools cut glass as well as emeralds, sapphires, ceramics, and calcium fluoride
, a glass-like mineral.
Fluorspar, also known as fluorite, is calcium fluoride
from wastewater is collected and reused to make cement.
It penetrates tissues readily and combines with calcium to form insoluble calcium fluoride
But since glass absorbs more UV radiation as the wavelength shrinks, stepper makers have begun using nonabsorbing crystals such as calcium fluoride
in the machine's optical components.