3mm and 4mm Tempered glass For French Doors and Windows

Enhanced Strength

LYD GLASS only uses A-grade float glass to produce tempered glass, which will reduce the self-explosion rate of tempered glass. 

Tempered glass will be packed in strong wooden boxes or steel pallets and our tempered glass complies with American (CAN CGSB 12.1-2022, ANSI Z97.1-2015(R2020) and CPSC 16 CFR 1201-2024) and European standards (CE EN-12150-2:2004).

• Superior Safety

  3mm and 4mm tempered glass specifically for French doors and windows.

  Let's be clear: Tempered glass is indeed a superior safety glass compared to annealed (regular) glass. This is its defining characteristic. However, the thickness of 3mm or 4mm for exterior French doors and windows presents a nuanced picture regarding overall "superior safety."

  Here's why

  Where 3mm/4mm Tempered Glass Offers Superior Safety (Compared to Non-Tempered): Reduced Injury Risk from Breakage: This is the primary and most significant safety advantage.

  How it breaks: When 3mm or 4mm tempered glass breaks, it shatters into thousands of small, relatively blunt, pebble-like pieces.

  Required by Code in Many Jurisdictions: For French doors and windows that are at or near floor level, and in other "hazardous locations" (like shower enclosures), building codes almost universally mandate the use of safety glazing, and tempered glass is the most common and cost-effective way to meet this. So, using 3mm or 4mm tempered glass in these locations provides the superior safety required by law.

  Where 3mm/4mm Tempered Glass Might NOT Offer "Superior" Overall Safety (Especially for Exterior French Doors & Windows): Resistance to Breakage (Impact Strength):

  While tempered glass is approximately 4-5 times stronger than annealed glass of the same thickness, 3mm and 4mm are inherently thin gauges.

  No Superiority: 3mm and 4mm tempered glass, especially in single-pane form, offers no superior thermal or acoustic performance.

  Structural Stability (for larger panes)

  For the size of panes often found in French doors and large windows, 3mm and 4mm tempered glass can exhibit noticeable deflection (bowing or flexing) under wind pressure. While the tempered glass itself may not shatter from this (unless extreme), it can feel flimsy and potentially put undue stress on the framing or sealing over time, which could compromise the overall integrity of the window system.

  Conclusion

  When discussing "superior safety" for tempered glass: YES, 3mm or 4mm tempered glass offers vastly superior safety in terms of reducing injury from broken glass compared to their annealed counterparts. This is its key, undeniable safety benefit and why it's legally mandated in many applications.

  However, for exterior French doors and windows, the thinness of 3mm or 4mm can limit the overall safety and performance profile in terms of resistance to breakage from impact, security against forced entry, and thermal/acoustic properties compared to what is typically recommended or required in modern building practices (e.g., thicker IGUs).

Advantages