Address:
Glafo, Box 5157,
SE-350 05 Växjö
SWEDEN

Visitor's address:
Vejdes plats 3

Tel: +46 10 516 63 50
E-mail: info@glafo.se

You find a map at the
"about Glafo" page.

VISCOSITY CALCULATIONS OF GLASS IN THE SYSTEM “LOW-MELTING GLASSES”(P1199)

The aim is to develop factors for viscosity calculations of glasses with lower melting temperature than usual and with only 60 % sand. The factors shall yield more exact calculations and we will be able to use them at further development of low-melting glass.

Background – development of a new glass system
Within the project “Low-melting glass” Glafo has developed a glass system with a melting temperature, which is about 100 °C lower than usual. This glass is energy saving and the melting equipment can therefore be a little more simple.

The silicon oxide content of the glasses is much lower than usual. That means that the levels of the other raw materials have changed and also the relative order. When these raw materials are to be developed, to achieve a viscosity that fits a certain manufacturing process, viscosity factors are needed, which are adjusted for the glass system in question.

Viscosity factor adjusted to the new glass system
It appeared that to achieve accuracy good enough at calculating viscosity it is necessary to have a limited glass area for the viscosity factors. Factors, which are used for a general calculation of any glass, often give a wide spread of the values.

Because of that for many years Glafo has been working on developing viscosity factors for different glass systems like e.g. soda glass, crystal glass, full-lead crystal, multi-component glass and fibreglass (glass wool). Each glass system has a limited interval for the chemical composition of the glasses. Within these intervals accuracy, which is better than ± 10 °C for a given viscosity level, is achieved. The longer outside this interval, the wider are the divergences of the calculations.

CURRENT PROJECTS