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A fracture in which the glass has separated along a new internal surface, even if the opening is extremely small.
GlassRenu · Educational illustration
Meaning and boundaries
A crack is not a superficial scratch or removable mark. Polishing does not restore a cracked lite to its original structural condition.
Why it matters in glass restoration
Cracking is normally a stop-work and replacement condition rather than a surface-restoration opportunity.
Related terms
References
- National Institute of Standards and Technology — Fractography of Ceramics and Glasses
Publisher’s original source - National Glass Association — Iridescence in Heat-Treated Architectural Glass
Publisher’s original source