Safety glasses are divided into:
 

A) Multilayer (laminated, the well-known "triplex"). These are two or more panes glued together with a combination of PVB membranes, which hold the pieces of shattered glass in case of breakage.

B) Heat strengthened, heat toughened, tempered - securit The heat treatment they undergo, adds to these glasses excellent resistance to stress. In addition, in case of breakage, they dissolve into very small pieces, unable to cause significant damage.