lewderry1 Posted July 19, 2012 Report Share Posted July 19, 2012 Can some one answer me this question: If silica based glass (similar silica we use in glazes) melts at 1400 Kalvin (wich is around 2000 fairegnheit) why is silica used in glazes considered to be a non-melting agent? When the majority of mid-to high fire glazes mature at a temperature above 2000 F. Link to comment Share on other sites More sharing options...
justanassembler Posted July 19, 2012 Report Share Posted July 19, 2012 Can some one answer me this question: If silica based glass (similar silica we use in glazes) melts at 1400 Kalvin (wich is around 2000 fairegnheit) why is silica used in glazes considered to be a non-melting agent? When the majority of mid-to high fire glazes mature at a temperature above 2000 F. because there are fluxes in glass that allow the silica to melt at lower temperature, just as 99% silica bricks do not melt at 2300 degrees because there is nothing present to flux the silica. Link to comment Share on other sites More sharing options...
neilestrick Posted July 19, 2012 Report Share Posted July 19, 2012 Glass is not just plain silica, but silica combined with fluxes (melting agents) so we can melt it at reasonable temperatures. Silica on it's own has a melting point of around 3000F degrees. We often use glass in glazes, in the form of Frits. The main difference between glass and glaze is the presence of aluminum oxide in glaze, usually sourced from clay (kaolin or other) and/or feldspar. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.