What is Safety glass?
Safety glass is the umbrella term for glass made to protect people better if it fails. In Switzerland you mainly encounter two types: ESG and VSG. ESG is thermally toughened, making it more resistant to impact and temperature changes; when it breaks it crumbles into blunt granules instead of sharp shards. VSG consists of two or more panes bonded with a tear-resistant plastic interlayer (usually PVB) – if the glass breaks, the fragments stick to the film.
The right choice depends on the application. ESG excels where mechanical or thermal stress dominates, such as shower partitions or glass doors. VSG is required wherever falling through or falling debris must be prevented – overhead glazing, all-glass balustrades, or floor-to-ceiling windows. VSG also offers better sound insulation and UV reduction and can be made burglar-resistant.
Safety glass is needed anywhere people can come into contact with glass: doors, balconies, stairs, wet rooms and large window areas. In many cases standards (such as SIA guidelines) prescribe the appropriate type of glass.
Pay attention to the marking and make sure the glass type suits the actual situation. A common mistake is using ESG where VSG with residual load capacity would be needed. Have the glass type, thickness and approval confirmed in writing.