Visible, tactile glass damage with small chips, flecks, rough breakout, pits, craters, fused particles, or other edge deterioration along or around the damaged area.
GlassRenu media library · Image source · Image source
Meaning and boundaries
Category 4 is deep but potentially assessable surface damage. It becomes Category 5 when a crack, inaccessible location, compromised construction, coating limitation, or other condition makes safe and effective in-place restoration impossible.
Why it matters in glass restoration
Chip flanks and flecking indicate a more severe morphology that may require substantial material removal and stricter controls for heat, distortion, remaining thickness, stress, and replacement comparison.
Related terms
References
- ASTM International — ASTM C1036-25: Standard Specification for Flat Glass
Publisher’s original source - National Institute of Standards and Technology — Fractography of Ceramics and Glasses, 3rd edition
Publisher’s original source - National Glass Association — Construction Site Protection and Maintenance of Architectural Glass
Publisher’s original source - GlassRenu — Visual Inspection Standards for Architectural Glass Damage Assessment and Restoration (VIS-A / VIS-DA)
Publisher’s original source