China Tempered Glass & Safety Glass Supplier & Suppliers

Fully tempered safety glass features surface compression above 69 MPa (structural codes often mandate 90–120 MPa) and breaks into small, relatively harmless dices upon impact. Heat-strengthened glass operates under 24 to 52 MPa surface compression; it is roughly twice as strong as annealed glass and fractures into large radiating shards that remain in the perimeter frame under load, making it ideal for tall curtain walls susceptible to thermal shock where fragment fallout must be avoided.

Heat Soak Testing (EN 14179-1) is an accelerated destructive test that forces the phase transformation of microscopic alpha-phase Nickel Sulfide (NiS) inclusions into beta-phase crystals. This phase change causes volume expansion (~4%), breaking contaminated panes within the monitored factory testing chamber rather than after installation high on a finished building facade.

No. Any cutting, waterjet trimming, drilling, or aggressive grinding after thermal tempering disrupts the high-energy surface tension balance, causing the pane to fracture instantly into granules. All dimensional fabrication, milling, countersinking, edge chamfering, and polishing must be completed prior to the heating and quench cycle.

Leading automated tempering lines keep overall bow and warp below 0.1% to 0.15% (substantially tighter than standard ASTM C1048 limits of 0.3%). Roller wave distortion is typically controlled within < 0.05 mm across a 300 mm gauge length, ensuring clear visual reflection and preventing optical distortion across low-emissivity glass assemblies.

Factory crating uses heavy-duty, fumigated timber or steel A-frames lined with moisture-barrier foil. Individual glass lites are separated using hydrophobic interleaving powders (adipic acid/lucite polymers) or EVA cork spacers. Industrial silica desiccant bags are sealed inside water-resistant wraps to control ambient humidity and eliminate chemical glass etching during long ocean transits.