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Flat glass heat-treated to a specified high surface-compression state and characteristic fragmentation behavior.
GlassRenu · Educational illustration
Meaning and boundaries
Tempered glass is not unbreakable. It is also not automatically suitable for every safety-glazing application without the required testing, marking, and construction.
Why it matters in glass restoration
Surface and edge damage, center-tension exposure, heat, inclusions, and fabrication history can affect failure risk during restoration.
Related terms
References
- Office of the Federal Register / CPSC — 16 CFR Part 1201: Safety Standard for Architectural Glazing Materials
Publisher’s original source - ASTM International — ASTM C1048-25: Heat-Strengthened and Fully Tempered Flat Glass
Publisher’s original source - National Glass Association — Engineering Standards Manual, Tempering Division
Publisher’s original source