When It Breaks, It Does Not Fly: PC Sheet in Public Spaces

Two failure modes

In public buildings, breaking is not the real problem; breaking dangerously is. Fragments falling from a canopy three or four metres up do far more damage than the panel is worth.

Four places that should use PC

Schools and kindergartens, where children climb, throw and kick balls — roof lights, corridor canopies and play-area roofs in PC mean no falling glass.

Stations and metro entrances, crowded with people beneath. Curved PC canopies are already standard practice in many cities.

Grandstands and stadium canopies, where a cantilevered glazed roof sits directly over spectators.

High-level skylights and roof lights, expensive to replace and the highest fall risk. PC is light, so even a fixing failure releases far less energy than glass.

What the codes require

Safety glazing. Most codes require safety glass — tempered or laminated — wherever people may strike a panel. Whether PC is acceptable depends on whether local codes list it, and that must be confirmed per project, never assumed.

Fire and egress. PC is combustible. Escape routes, fire compartments and locations requiring fire separation must follow the code, using higher-rated product with test reports where needed.

Smoke and molten droplets. Fire behaviour differs from glass and needs assessment in crowded buildings — a point procurement often misses.

Three practical recommendations

Prioritise PC at height, where fall energy is greatest and the safety benefit largest; avoid mixing glass low and PC high purely to save cost, since maintenance and spares become complicated; and specify "does not produce fragments" rather than "shatterproof", which is more precise and harder to fudge.

Its weaknesses

It scratches easily, and public facilities get scratched; it is combustible, so not permitted everywhere; and it yellows, which UV-protected grades mitigate. Safety performance does not solve everything — it solves whether the worst case injures someone.

FAQ

Is PC a substitute for safety glass? In some codes and applications, subject to local authority acceptance. Do not assume impact resistance equals compliance.

Can a cracked panel stay in service? Whitening and dents are acceptable; any perforation or propagating crack is not, because capacity has dropped.

PC versus laminated glass? Laminated glass holds fragments on its interlayer and also does not scatter; PC is lighter, tolerates repeated impact better and is less likely to fall as a whole. Both are valid safety options — choose by code and cost.