DSS-M.01.03 — Glass-on-Glass Track (paired arcs/lines)

Paired, often parallel arcs or lines produced when a glass lite contacts/moves against another glass surface or a similarly hard, smooth element (e.g., stacked lite, cart rail with glass contact). Presents as directional linear paths; depth may range from faint polish disturbance to tactile scoring with micro-chipping (“chip flanks”) visible in raking light. Terminology for micro-chipping/chip flank and evaluation by surface-catch (MSRT) follow VIS §3 and §5.5; classification uses appearance cues under VIS viewing/lighting.

Two closely spaced, partially concentric arcs or paired lines that correlate with a sweep/pivot path of contact; may show periodic intensity along travel.

Directionality is evident at inspection geometry; strongest in raking light/oblique sweep; persists after Non-Invasive Reveal (clean & dry).

Surface-catch class (MSRT):

SC-1 (slight) for shallow track polish/lineation; SC-2 (clear) where chip flanks/micro-chipping occur. Perform one light, non-marring pass only; MSRT supports classification, not acceptance.

Reveal / lighting / geometry:

Complete Non-Invasive Reveal (distilled/neutral-pH water; lint-free microfiber; no blades/chemicals) before evaluation. Inspect at 12 / 36 / 72 in, normal incidence + oblique sweep (~60°-120°) with raking light, per VIS.

Location / access:

Confirm the cue is on the exposed face (not between panes). Use fixed parallax to identify between-pane look-alikes; record surface numbering (#1-#4 / laminate-internal) on Forms:

Assign CAT by visibility convention and MSRT with the three-part cueing (surface catch + morphology + location):

CAT-2 - Light: Narrow, clean lines/paired arcs with SC-1, no pronounced chip flanks; limited impact at standard view.

CAT-3 - Moderate: SC-2 with minor chip flanks; track(s) noticeable at standard distance.

CAT-4 - Severe: SC-2 (clear-to-strong) with rough chip flanks, local pits/craters; distinctly visible at standard and wide-field views.

(Classification is appearance-based; acceptance is handled separately in VIS §6.)

CAT-2: ~0.2-1 μm (fine lineation; minimal edge breakout).

CAT-3: ~1-5 μm with incipient micro-chipping along flanks.

CAT-4: ≥5 μm with rough chip-flank breakout, occasional pit/crater. (Depths are illustrative for cueing only; VIS classification/acceptance remains appearance-based.)

vs. Scraper/Razor scoring (M.01.01): Scraper lines are often single, ruler-straight or hand-guided; glass-on-glass tracks typically occur as paired arcs/lines following a sweep path. (Confirm chip flanks for depth.)

vs. Straightedge/guide scoring (M.01.02): Guide scores are ruler-straight with consistent depth; tracks usually show arc geometry and periodic intensity along travel.

vs. Residue films/overspray (R-family): Residues change with Non-Invasive Reveal; true tracks persist.

vs. Between-pane cues (A-family): Internal features show fixed parallax → CAT-5 by location (out of in-place scope).

Photo set (VIS): 12 / 36 / 72 in, normal + oblique, include raking; add macro frames of the paired lines showing edge morphology (chip flanks if present) and no worked transition edge. Record reveal status, lighting, and time.

MSRT result: Record SC class (SC-1 / SC-2 as observed); one pass, non-marring.

Forms: Pane ID; surface numbering (#1-#4 / laminate-internal); worked surface Y/N; geometry checklist; photos attached (per VIS Appendix X3 fields).

Attempting to “feather” a track during inspection can create a worked region/transition edge, which VIS disallows at acceptance for CAT-0...CAT-4. Keep evaluation non-marring and appearance-only.

M.01.03 Glass-on-Glass Track (paired arcs/lines) - Paired arc/line track at #__ confirmed after Non-Invasive Reveal; MSRT = SC-1/SC-2; chip flanks present/absent (record). Classified CAT-2/3/4 by visibility and flank severity per VIS. Photo set at 12/36/72 in (normal + oblique + raking); surface numbering recorded. Acceptance per VIS §6 (appearance-based).