At high temperature conditions, the glass molten by the combined action of gravity and surface tension form an oval. Through digital image measurement system we can obtain glass molten oval contours and the contact angle. By the Bashforth-Adams equation which deduced from Young- Laplace equation to obtain the glass molten' surface tension at the corresponding temperature conditions. This method has good reproducibility and accuracy.

This study selected high alkali aluminosilicate glass as the research object. It’s belongs to the SiO2-Al2O3-RO-R2O glass system. By changing the content of Al2O3in the SiO2-Al2O3-RO-R2O glass system, designed five basic glass formula. Using conventional melting method prepared the high alkali aluminosilicate glass. In the case of the same heat treatment, the glass formulations are the most important factor in the glass surface tension. Using the glass surface tension measuring instrument, focus on the content of Al2O3on the glass surface tension’s effects law. The results show that the high alkali aluminosilicate glass’s surface tension are increase with the increase of Al2O3content. The relation between glass surface tension and the content of Al2O3conforms to the formula Y=290+6.5WAl2O3, Al2O3factors influence the surface tension of the glass is 6.5.

The under surface depression of foam glass blanks as one of the typical defects, influences and impedes the quality of foam glass and material cutting rate. This paper studies the water content of release agent and open flame burning temperature effects on under depression of foam glass, to reveal its generation mechanism, using TG-DSC, XRD, FTIR, and other analytical methods. The results show that, with the increase of drying temperature, the under surface depression phenomenon reduces, indicating the air cavity caused by heating vaporization of water molecules. The surface is white. In the early flame heating, firing temperature is more than 700°C, by the mold bottom heating carbon, resulting in carbon black early reaction gas, not be wrapped by glass, eventually gathering to form an air chamber. The surface is grey.