Required by some local building codes for certain situations, safety glass is always a good choice if there’s any risk of a person walking through a window or door. Safety glass is available tempered, laminated, or wire-reinforced. Tempered glass is heat-treated during manufacturing and crumbles instead of shattering if broken. Laminated glass has a film of plastic that holds the glass together if broken. Wire-reinforced glass clings to its wire mesh if broken.