DSS-Co.02.02 — Surface Rub / Scuff (Pyrolytic Hard-Coat Appearance Change)

Surface rub / scuff (pyrolytic) is an appearance change confined to pyrolytic (hard-coat) functional coatings where contact, wiping, or pad/roller kiss produces localized sheen shift or faint mottle without discrete linear chip flanks or pits. The effect is planar within the coating and is usually non-tactile. Classification is appearance-only per VIS (method-agnostic). Inspect after Non-Invasive Reveal under VIS lighting/geometry; record surface numbering and worked-surface status.

Face identification is critical. Pyrolytic hard-coats are commonly at #2 in IGUs (or #1/#4 by design). Confirm coated face prior to classification.

• Subtle, patchy sheen shift or low-contrast rub panel; boundaries are soft/feathered, sometimes following wipe arcs or contact zones (e.g., handling pads).
• No strong directionality; reads best in oblique/sweep and broad specular reflection.
• May co-present with very faint parallel “kiss” traces in transport areas but without periodic roller pitch (cf. Co.02.01).

Surface-catch class (MSRT)

• SC-0 typical (planar optical change).
• SC-1 localized only if a very light micro-imprint/texture is present (e.g., pad weave ghost).
• Perform one light, non-marring pass on a small revealed test patch; polymer stylus only on suspected coated faces. MSRT supports classification only; do not abrade the coating.

Visual signature

• Sheen or color cast change within a soft-edged patch; no chip-flank sparkle, no discrete grooves, no pits/fused nodules.
• Typically lot-isolated (handling/maintenance event) rather than lot-wide repetition.

Viewing / lighting

• Evaluate clean & dry at 12 / 36 / 72 in, normal and oblique sweep (~60°-120°); use broad raking to make sheen shifts apparent. Record distances/angles in-frame.

Location / access

• Record pane ID and surface numbering (#1-#4; laminate-internal). If on #2/#3 (IGU interior), it is inaccessible in place → CAT-5 by location (classification remains Co.02.02).

Mechanism cue (context)

• Handling/cleaning contact on coated face; improper wipes, abrasive cloths, or pad contact; absence of field activities that produce scoring (M.01) or chemical swirls (V.02/Ch.01).

Assign CAT by visibility at acceptance geometry and MSRT.

• CAT-1 (Benign / non-relief): Faint rub panel visible mainly at oblique/raking; SC-0. Indicative relief: 0-10 μm (optical only).
• CAT-2 (Light): Discernible sheen shift at standard distance in certain lighting; SC-0 (or SC-1 localized if micro-imprint present). Indicative relief: ~10-40 μm (apparent optical).
• CAT-3 (Moderate): Pane-noticeable patch/panel at standard distance affecting uniformity; SC-0/SC-1. Indicative relief: ~40-120 μm (apparent optical).
• Reclassify when: Parallel periodic bands at fixed pitch → Co.02.01 roller ghosting; linear chip-flank grooves → M.01 scoring; modeled chemical micro-texture with runs/meniscus → V.02/Ch.01; peppered fused nodules → Th.01.02.
• CAT-5 (by condition/location): Between-pane/inaccessible or coating-side constraints preclude compliant presentation → CAT-5.

CAT is appearance-based; acceptance is separate under VIS-A at 12/36/72 in. Do not abrade coated faces to “force” a response.

• vs. Co.02.01 roller ghosting: Roller ghosting shows parallel bands with regular pitch; rub/scuff is localized with soft boundaries and no fixed pitch.
• vs. M.02 abrasion swirls: Abrasion swirls show directional/swirl patterning and often SC-1 across paths; Co.02.02 lacks coherent swirl geometry and remains largely SC-0.
• vs. Ch.03 mineral film/etch: Mineral systems show ring/run geometry and can be SC-1/SC-2; Co.02.02 is planar and non-ringed.
• vs. Sputtered low-E patchiness (Co.01.02): Sputtered non-uniformity may be lot-wide color variations without wipe history; Co.02.02 associates with contact/wipe context on a hard-coat face.

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique; raking macros across rub panel boundary; overview frames to show localization. Record distance/angle in-frame.
• Face ID + MSRT. Confirm coated surface; MSRT (polymer stylus only) on revealed patch: record SC-class (SC-0 typical; SC-1 localized if present).
• Context notes. Handling/maintenance history; cleaning media used; adjacency to contact points (pads, rails, suction cups).
• Forms: Pane ID; product family & surface numbering; worked surface Y/N; functional coating present on worked surface? (Y/N/Unknown); reveal status; lighting/time; geometry checklist; photos attached.
• Acceptance split: Post-restoration acceptance per VIS-A §6; classification ≠ acceptance. Coated-face appearance rules apply per VIS §6.2.e when the worked surface is the functional coating.

• Co.02.02 Surface Rub / Scuff (Pyrolytic) - Localized sheen-shift/mottle on surface #___ (pyrolytic hard-coat confirmed); MSRT (polymer): SC-0 [SC-1 localized if micro-imprint]; visible at [12/36/72 in] under VIS geometry. Morphology: planar coating appearance change, soft boundaries, no chip-flank grooves, no pits. Classification: CAT-[1/2/3] by visibility; reclassify per notes if roller-pitch, mechanical scoring, or chemical indicators are present; CAT-5 if between-pane or coating-side constraints preclude in-place work. Forms + photo set attached; acceptance per VIS-A §6.