The static strength and delayed fracture strength characteristics of the glass used for CRTs were examined. The influences of surface roughness, thickness and test conditions on them were examined. The main results obtained are summarized as follows. (1) The influence of surface roughness on the static strength was especially recognized. (2) The delayed fracture strength of the scratched specimen, which was normalized by the static strength, was lower than those of the polished and abraded specimens.
