Determination of which physical glass face is exposed and whether it carries a coating, film, frit, paint, treatment, residue, or other layer.
GlassRenu · Educational illustration
Meaning and boundaries
Identifying the room-side or outdoor side is not enough; insulating and laminated constructions contain additional numbered surfaces.
Why it matters in glass restoration
Abrasive or chemical work can permanently alter exposed coatings, films, decorative layers, mirrors, and treated surfaces.
Related terms
References
- National Glass Association — GANA Glazing Manual, 2022 edition
Publisher’s original source - ASTM International — ASTM C1376-21a: Pyrolytic and Vacuum Deposition Coatings on Flat Glass
Publisher’s original source - National Glass Association — Marking and Labeling of Architectural Glass
Publisher’s original source - Vitro Architectural Glass — Glass Cleaning Recommendations
Publisher’s original source