A single thick sheet of polycarbonate can stop a round, but laminated polycarbonate glazing stops it better: it bonds several thinner layers so the impact spreads across the interlayers and the panel does not spall or eject fragments.
Why layers beat one thick sheet
When a projectile hits a laminated panel, the first layer slows it and the interlayer absorbs energy, so the remaining layers catch it without throwing fragments. A single thick sheet can stop the round but may crack through or produce sharp fragments on the inner face. Lamination also gives more design freedom on thickness and lets the panel be sized and finished like a normal glazing unit. The layer build, the interlayer and the edge anchor together decide the rating, so a panel is only as good as its edge fixing.
The three things that set the rating
- Layer build and number of plies for the threat level.
- Interlayer that absorbs impact across the panel.
- Edge anchor that holds the panel in the frame.
- UL or EN test documentation for the build.
How the ballistic grade is sourced is covered in the ballistic grade polycarbonate guide, and the levels explained in UL 752 ballistic ratings explained.
Frequently Asked Questions
Q: Why is laminated polycarbonate glazing better than one thick sheet?
A:Multiple bonded layers spread the impact across interlayers and stop spalling and fragments. A single thick sheet may stop the round but can crack through or throw fragments on the inner face.
Q: What decides the rating of laminated polycarbonate glazing?
A:The layer build, the interlayer that absorbs impact, and the edge anchor that holds the panel in the frame. The panel should carry UL or EN test documentation for that build.
For a laminated or glass-clad polycarbonate ballistic panel quoted to your threat level, size and frame, email oversales@rpplexiglass.com with the threat class, panel dimensions, frame type and test-report requirement.