玻璃加工工艺的改进与提高（二）

THE IMPROVEMENT AND ENHANCEMENT OF GLASS

市场已有的料器玻璃料、钠钙玻璃料、铂组玻璃等、一般为载币玻璃，这些材料成本高，因它的形状系数大，80-100×10-7，熔点低，软化点低300-400℃，热稳定性能差，耐热温度120℃左右就爆型。化学稳定性差，长期在潮气下，表面会出现小斑点、变松和发毛等，为“风化现象”。粘皮也差，加工性能较差，长时间熔经，容易出现失透现象，故不能制作精细复杂的工艺品。

The glasses on the market almost are soft glasses, such as Glassware glass, soda-lime glass and so on. They have many characters such as high cost, large coefficient of expansion 80-100×10^-7. low melting point low soften point 300-400℃, the margin of sudden lemperature change about 120℃. bad chemical stability, easy to be weathered, low viscosity, difficult to be processed and so on.