DSS-Co.01.01 — Abrasion Sheen Shift / Rub Marks (sputtered low-E & multilayer films)

A localized change in sheen, luster, or color cast on a sputtered low-E or other multilayer functional coating, typically caused by contact, friction, or over-working at the exposed coated face (#1 or #4, as applicable). Presents as a rubbed patch, streak, or directional band without discrete chip flanks. On coated worked surfaces, appearance anomalies introduced by restoration are not permitted at acceptance (see VIS §6; coating appearance context per ASTM C1376).

• Matte or glossy “rub area” that reads as sheen shift vs. surrounding field; strongest under raking light and oblique sweep.
• Linear or arcuate streaks aligned with prior motion paths (pads, squeegees, cloths); no bright chip flanks as with scratches.
• May co-exist with micro-mottle or faint color non-uniformity within the patch. The cue persists after Non-Invasive Reveal if it is a true coating-appearance change.

Surface-catch class (MSRT):

• Expect SC-0 (none) when the anomaly is purely optical in the coating stack. Perform one light, non-marring pass only; prefer a polymer stylus on suspected coated faces or rely on visual cues to avoid coating disturbance. Do not abrade or “probe.” MSRT supports classification only, not acceptance.

Reveal / lighting / geometry:

• Perform Non-Invasive Reveal (clean & dry; no blades/chemicals) before evaluation. Inspect at 12 / 36 / 72 in, normal incidence + oblique sweep (~60°-120°) under raking light, per VIS.

Location / access:

• Confirm the observation is on the exposed coated face (not between panes). Record pane ID and surface numbering; note “functional coating present on worked surface? (Y/N/Unknown)” on Forms:

• Typical CAT band (appearance-based):
• CAT-1 if non-tactile sheen shift with SC-0 and no edge morphology.
• CAT-2 if subtle micro-texture yields SC-1 (slight).
• CAT-3 if pronounced, patchy modeled micro-texture visible at standard distance, still without chip flanks. (Use VIS visibility convention and MSRT outcome; assign CAT by observable cues, not by cause.)
• Acceptance split (critical): Even if classified CAT-1...CAT-3, coating anomalies on the worked surface are not permitted at acceptance under VIS §6.2 (“Coatings”); acceptance remains appearance-based at required distances/angles.

• For true coating rubs, the glass surface relief is typically nil at the MSRT scale (SC-0). Numeric depth in μm is not determinative for coating-appearance anomalies; VIS acceptance is appearance-only.

• vs. Mechanical scratches (M.01): Scratches show chip flanks/micro-chipping and SC-2 along a line; coating rubs lack chip flanks and are area-based sheen shifts (often SC-0).
• vs. Face films/residues (R-family): Residues change with Non-Invasive Reveal; a true rub persists after reveal.
• vs. Between-pane haze/volatiles (A.01.01): IGU internal cues show fixed parallax and are CAT-5 by location; coating rubs are on the worked face.

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique, include raking; add a macro frame showing boundaryless sheen shift (no transition edge/chip flanks). Note reveal status and lighting/time.
• MSRT result: Record SC class (expect SC-0); one pass, non-marring; on coated faces prefer polymer stylus or visual-only.
• Forms: Pane ID; surface numbering; worked surface Y/N; functional coating present on worked surface? (Y/N/Unknown); geometry checklist; photos attached.

Attempting to “blend out” a coating rub by further contact can enlarge the anomaly and create a visible worked region/transition edge, which VIS disallows at acceptance (CAT-0...CAT-4). Keep classification appearance-only; do not introduce new coating changes.

• Co.01.01 Abrasion Sheen Shift / Rub Marks (sputtered low-E) - Localized coating sheen shift/streaks at #__ verified after Non-Invasive Reveal; MSRT = SC-0 (no tactile relief); no chip flanks. Classified CAT-1...CAT-3 by visibility and texture per VIS. Acceptance note: Coating anomalies on the worked surface are not permitted at VIS §6.2; document at 12/36/72 in (normal + oblique + raking), record surface numbering and coating presence, and retain images with macro detail.