[PA-NJ Glassblowers] Compatibility of Glasses - COE Does Not Equal Compatibility

Tony Patti gaffer at glassblower.info
Wed Mar 6 20:43:26 EST 2013




Bullseye president Dan Schwoerer has updated Technotes 3: Compatibility of

his influential 1997 paper with new information specifically for kiln-glass

If you've ever had questions about Measured COE, Calculated COE, viscosity,
or other aspects related to compatibility, Technotes 3 is a must-read.


A misunderstanding that the compatibility or "fit" of two glasses is solely
a function of their expansion properties has led to an overemphasis on
"expansion" and the numerical value of the coefficient of expansion (COE) of
glass. Studio artists continually ask us for the COE of a glass, hoping to
predict whether it will "fit" other fusing glasses or their own furnace
glass. We say the same thing each time: Matching COEs is simply not an
accurate measure of compatibility.


The viscosity characteristics of a glass are equally important as its
expansion characteristics. Together, these two properties determine whether
one glass will fit another.  But it will be useful to first discuss each
individually as it pertains to this subject.


Tony Patti
 <http://www.glassblower.info> www.glassblower.info
 <mailto:gaffer at glassblower.info> gaffer at glassblower.info

 <http://www.glassblower.info/qr-code.html> QR Code for Tony Patti -



-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://glassblower.info/pipermail/pa-nj/attachments/20130306/07f03378/attachment.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 18749 bytes
Desc: not available
Url : http://glassblower.info/pipermail/pa-nj/attachments/20130306/07f03378/attachment.jpe 

More information about the PA-NJ mailing list