Why Glass Standards Determine Life. When a train or bus is involved in a crash, passengers’ survival often depends on one thing: whether the window can become an emergency exit. In this video, you’ll see a SSafe-T-Punch TMactivated on a correctly assembled double‑glazed window — both panes made of R43 Toughened Safety Glass. The result? The glass fragments under force, creating a viable emergency exit exactly when it’s needed most. But not all assemblies are equal. Some hybrid double‑glazed wind