Glass Railing Technical Specifications: VSG, ESG, Wind Load & Standards

ESG (Einscheiben-Sicherheitsglas / single-pane tempered) shatters into small harmless fragments on impact. VSG (Verbund-Sicherheitsglas / laminated safety glass) holds together when broken, as the PVB interlayer keeps fragments bonded. For glass railings, VSG is mandatory — if a panel breaks, it must remain in place as a barrier until replaced.

Glass thickness depends on wind load, railing height and support span. EN 16612 provides the calculation methodology. Typical specifications: 2×6 mm VSG for residential low-rise, 2×8 mm for mid-rise, 2×10 mm for commercial, 2×12 mm or 2×15 mm for high-wind/high-rise applications. The PVB interlayer is typically 0.76 mm or 1.52 mm.

Tempered glass can spontaneously break due to nickel sulfide (NiS) inclusions. Heat Soak Testing (HST per EN 14179-1) subjects panels to 290°C for 4 hours, causing NiS-affected panels to fail in the factory rather than on site. HST is recommended for all glass railing applications and mandatory for safety-critical installations.

A complete glass railing tender specification should include: glass type (VSG-ESG), thickness per ply, interlayer type and thickness, edge treatment (polished, ground, chamfered), surface treatment (clear, tinted, printed, frosted), heat soak requirement, maximum panel dimensions, load requirements per EN 1991-1-1 and relevant DIN standards.