Effects of humidity on the weathering of glass

摘要: Abstract The weathering of 26 glass compositions was investigated under static conditions 30%, 50%, 75%, 90% and 98% relative humidity (RH) at 50°C a cycling condition between 77% RH 50°C. found to be less severe than RH. effect level on studied showed that water adsorption increases with time humidity, whereas alkali generation time, but not always humidity. Significant occurs for some glasses 30% the quantitative being almost as great Visual observed when generated 0.5 μg/cm 2 . Various techniques evaluating humid were investigated. appearance judged best evaluation method routine tests. It represents most concern is sufficiently precise. Electron microscopy, measurement sorbed are principally used research studies. Weight change haze lack sensitivity reproducibility. A standard test defined. 12 weeks. visual ranking system used. generally ranked in same order by various techniques.