玻璃密度测量方法比较与实践

Comparison and Practice of the Methods of Measuring Glass Density

玻璃密度是玻璃生产控制的关键指标,玻璃密度常用的测量方法是沉浮比较法(简称沉浮法)和悬浮法。对两种密度测量方法的测量原理、测量精度、重复性、操作便捷性进行分析和比较。结果表明:沉浮法的测量精度相对较高,但操作相对复杂,测量周期长,密度测量偏差不超过±0.000 3,但测量用密度液有环境污染,并且需定期校正和更换,该方法适合监督检验和仲裁使用;悬浮法操作简便,测量周期短,当玻璃试样质量大于10 g时,重复性好,测量偏差较小,测量偏差不超过±0.000 5,可作为一般质量监督和玻璃生产质量控制。

Glass density is a key indicator of glass production control, common methods of measuring glass density include method of the sink-float comparison and standard Archimedes method. In this paper, the principle, accuracy, repeatability and operational convenience of the two test methods for determining density of glass were analyzed and compared. The results show that accuracy of sink-float method is relatively high, but the operation is relatively complicated and the measuring period is longer. Fluctuation of measured density values is less than or equal to ± 0.000 3, but the test liquid used for measurement would pollute environment and need correction and replacement periodically. This method is suitable for supervision and inspection and also for arbitration. Standard Archimedes method is easy to operate and measuring period is shorter. Fluctuation of measured density values is less than or equal to ± 0.000 5. It can be used for general administration of quality supervision and quality control in glass production