Laminated glass will hold together upon impact and cracks into a spiderweb pattern
Laminated Glass is an assembly of two or more layers of glass bonded together with a interlayer of polyvinyl butyral (PVB) so that it the shards hold together when shattered. The layers can be normal or tempered glass. When laminated glass is broken it creates a “spider web” pattern and all the pieces stay attached to the interlayer. Laminated glass is typically used where its possible for human impact, like a shower door, or where the glass could fall if shattered like a skylight.
Because laminated glass is comprised a multiple layers it is also used when acoustic properties are needed.
Image courtesy Marie Richie