Determination of the Viscosity of Quartz Glass within the Softening Range
JSGT 1936 V20 T139-T143
The viscosity of quartz glass in the softening range was determined by the elongating rod method from 1100° to 1450°, The viscosity varied from 5×1013 to 9×1011 poises. The temperature–log viscosity curves changed direction at about 1012·5 to 1013 poises corresponding to a lower limit of the softening range, T0, of 1220° to 1240°. Samples of silica glass from different sources gave slightly different results, due to the varying amounts of impurities present.
M. P. Volarovich & A. A. Leontieva
