•The secret to cool bodies and glazes is a lot of testing.
•The secret to know what to test is material and chemistry knowledge.
•The secret to learning from testing is documentation.
•The place to test, do the chemistry and document is an account at https://insight-live.com
•The place to get the knowledge is https://digitalfire.com

Sign-up at https://insight-live.com today.

Fluorspar

Formula: CaF2
Alternate Names: Fluorite, Calcium Fluoride, Blue John

OxideAnalysisFormula
CaO71.80%1.000
F48.65%2.001
Oxide Weight94.11
Formula Weight94.11
If this formula is not unified correctly please contact us.
DENS - Density (Specific Gravity) 3.10
GSPT - Frit Softening Point 1330C M

CaF2 is used in frit preparation and as a low-fire enamel opacifier. It's value lies in the fact that it is an active flux and at the same time an opacifier.

At higher temperatures the fluorine becomes volatile and is released as a poisonous gas. This happens as O2 combines with CaF2 to produce CaO and F2 gas. Even if the gas can be tolerated, the material slowly decomposes to evolve the fluorine gas, and thus is troublesome for use in glazes because of the blistering problems.

If fluorspar is being used as a source of Ca at higher temperatures to create CaO oxide in a glass there has to be an oxidizing atmosphere in the kiln to supply the needed oxygen.

Fluorspars have varying amounts of iron contamination and can be very clean.


Mechanisms

An original bag of Fluorspar

An original bag of Fluorspar

Out Bound Links

In Bound Links


By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Fluorspar" descrip="" searchkey="Fluorite, Calcium Fluoride, Blue John" loi="0.00" casnumber="7789-75-5"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="71.800" tolerance=""/> <oxide symbol="F" name="Fluorine" status="" percent="48.650" tolerance=""/> </oxides> </material>


Feedback, Suggestions

Your email address

Subject

Your Name

Message


Copyright 2003, 2008, 2015 https://digitalfire.com, All Rights Reserved