Updated: 07.11.2026
Laminated safety glass (VSG) consists of at least two glass panes bonded with a tear-resistant interlayer. If the glass breaks, the fragments stick to the interlayer and do not fall down.
Reading the designations
- 33.1: two 3 mm panes with one 0.38 mm interlayer
- 44.2: two 4 mm panes with two interlayers, 0.76 mm in total
- 55.2: two 5 mm panes with 0.76 mm interlayer
Where is laminated glass used?
Above all in overhead glazing such as glass roofs, roof windows and continuous rooflights: according to DIN 18008, the lower pane here usually has to be laminated glass. Also in fall-protection glazing and where burglary protection is required.
What does laminated glass mean for the window actuator?
Like normal glass, laminated glass weighs about 2.5 kg per m² and mm of glass thickness; the interlayer adds little. An insulating unit 44.2 VSG-16-4 therefore weighs about 31 kg per m². The heavier glass increases the required force, especially on roof windows. Values for common build-ups are shown in the entry Glazing build-up.
Frequently asked questions
Is laminated glass the same as toughened glass?
No. Toughened safety glass is thermally tempered and breaks into small crumbs. Laminated glass holds the fragments on the interlayer.
Read more
See also in the glossary: Overhead glazing
Tools: Calculate force and stroke with the Window actuator calculator, find the right model in a few questions with the actuator finder.
Not sure which actuator fits? Call us at 040 50694631 (Mon–Fri 8 am–5 pm) or use the actuator finder.
