glass analysis


I need to find a quick, easy, and cheap way to verify that the composition of the glass I am producing is in a definite range. I am producing glass in a lab scale facility so i really need an easy and fast method. I thought about using the color of the glass, or maybe its density, but I don't know how to correlate these data with the composition. Has any of you faced this problem and found an answer?Thanks a lot.

Guest User
Wed, 12/10/2005 - 13:00

You can choice between one, or more to follow characteristics: thermal coefficient of expansion, refraction coefficient, Littleton point, density, etc. You must determine definite range with mathematical relations (book glass) between characteristic and glass composition.
But, for glass with more oxides, this correlation is approximate. It is preferably if you can using two or more characteristics. Otherwise, the information is just a attention for you.
Best regarde

loredana moimas
Tue, 18/10/2005 - 11:10

thanks a lot for your reply...I tried to look in the literature information so to be able to find some appropriate models but, because of the complex system, I am dealing with a glass containing three different network formers and four modifiers it is a bit hard and I still have a lot of work to do.
Thanks once more.

Guest User
Thu, 20/10/2005 - 10:57

Using the sink method (using an automatic glass density measurement device eg. Futronic) the physical density of glass samples can be measured with high precision. (Small)Changes in glass composition can easily be detected using thsi technique. However, these density measurements won't give you information about the chemical composition of the glass. Analyses of compositions can best be done using X-Ray-Fluorescence.

Guest User
Fri, 21/10/2005 - 01:54

I am a Canadian glass guy. Your problem is simple for me But I canot help you without further info
Indeed, you can use density to control glass , it will not provide you with much info re composition. You need an AA unit or an X-ray machine. I would suggest you contact a University and find one with an X-ray Machine which will give you a complete analysis of everything in your glass
I recently did some work for a Russian glass company and found that they had Strontium in their glass - to their complete suprise.
They did not know that it was there due to a lack of an analytical capability.
If you can tell me what is in your glas - raw materials used and composition - I will be able to tell you what is in your galss and the analytical procedures required to analyze it.

Norm Sutherland C.Chem
Glasstech - International

Guest User
Tue, 25/10/2005 - 23:24

We have no problem determining the precise chemical composition of glass, including minute trace elements in parts-per-million amounts. It is your requirements for a quick, simple, cheap technique that we have never mastered. For forensic purposes, we use EDS for the major components and LA-ICP-MS (laser ablation inductively coupled plasma mass spectrometry) for trace amounts of other elements. While not cheap and easy, that method might provide validation data for simpler tests.

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