A key feature of an anti-burglary window or patio door is its particularly robust glass. Taking up the majority of the product's surface, it is a central element that should be reinforced. This can be achieved in two key ways:
- The first is that laminated safety glass (LSG) is used.
Able to be applied to both the inner and outer-most pane, the modern glass consists of invisible PVB polymer window film interlayers. This makes the glass stronger and harder to break. In the case of breakage due to very high force, the broken glass then remains held in place on the intact window film. This prevents it from shattering out in sharp shards while the foil will then need further tools to be torn through.
- An anti-burglary window or burglar-proof door can also feature tempered safety glass (TSG).
Used in a similar way for both the inner or outer-most pane, the glazing is a type of heat toughened glass. Particularly flexible, it is highly impact and shock resistance, meaning it won't break easily. If broken due to high force, the glass will then come out in small blunt-edged pieces, improving safety and protection.