Determination of whether glass is annealed, heat-strengthened, or fully tempered using available records, marks, instruments, and qualified interpretation.
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Meaning and boundaries
One visual clue, strain pattern, edge appearance, or missing mark does not always provide conclusive identification.
Why it matters in glass restoration
Heat treatment affects fracture pattern, residual stress, surface condition, fabrication limits, safety marking, and work risk.
Related terms
References
- National Glass Association — GANA Glazing Manual, 2022 edition
Publisher’s original source - National Glass Association — Iridescence in Heat-Treated Architectural Glass
Publisher’s original source - National Glass Association — Marking and Labeling of Architectural Glass
Publisher’s original source - ASTM International — ASTM C1048-25: Heat-Strengthened and Fully Tempered Flat Glass
Publisher’s original source