Safety glasses

优选词，正式主题词

1. Safety glass, type of glass that, when struck, bulges or breaks into tiny, relatively harmless fragments rather than shattering into large, jagged pieces. (Britannica). 2. A safety glass consists of a sandwich structure composed of a polycarbonate film of 1 mm thickness placed between two glass plates of 3 mm thickness. (ScienceDirect, Introduction to Materials Science, 2002).