Visible surface damage that can be seen in direct sunlight or controlled raking light but cannot be felt with a light pass of a clean, dry fingernail.
GlassRenu media library · Image source · Image source
Meaning and boundaries
Category 2 is glass damage rather than removable Category 1 material. Any repeatable tactile catch moves the condition to Category 3 or Category 4, depending on whether chip flanks or flecking are present.
Why it matters in glass restoration
This is the lightest GlassRenu damage class and may be addressed through polishing or very light controlled abrasion after glass type, coating, location, and safety checks are complete.
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 - GlassRenu — Visual Inspection Standards for Architectural Glass Damage Assessment and Restoration (VIS-A / VIS-DA)
Publisher’s original source