DSS-M.05.01 — Short FD Scratch Cluster

A short FD scratch cluster is a localized patch (typically hand-sized or smaller) of multiple short, generally parallel fine scratches produced by entrained grit/debris during factory washing/handling. Lines are co-oriented, often confined to a narrow zone, and persist after Non-Invasive Reveal. Classification is appearance-only per VIS (method-agnostic). Inspect after Non-Invasive Reveal using VIS lighting/geometry and record surface numbering and worked-surface status on Forms:

• Tight patch of short, parallel or slightly fanned lines (mm to cm length), often one orientation.
• Strongest in raking light; at higher severity, edges show micro-chipping (“chip flanks”) with bright sparkle.
• Often near wash flow paths or handling lanes; no continuous long tracks across the lite (distinguishes from M.01 tracks).

Surface-catch class (MSRT)

• Light clusters: SC-1 (slight); pronounced clusters: SC-2 (clear) where chip flanks are present. Perform one light, non-marring pass only; polymer stylus on suspected coated faces. MSRT supports classification, not acceptance.

Visual signature

• Multiple short, co-oriented scratches within a compact area; no long, continuous lane. Look for consistent stroke width and fine debris satellites.

Viewing / lighting

• Evaluate clean & dry at 12 / 36 / 72 in, normal incidence + oblique sweep (~60°-120°) with raking light; record distances/angles in-frame.

Location / access

• Confirm on the exposed face. Use parallax in IGUs-fixed parallax indicates between-pane → CAT-5 by location. Record surface numbering #1-#4 / laminate-internal on Forms:

Assign CAT by appearance + MSRT + morphology (three-part cueing under VIS). Depths below are indicative to anchor the spectrum:

• CAT-2 (Light): Fine, shallow lines; SC-1, clean edges, no chip flanks; mainly a raking-only cue at close/standard view. Indicative depth: ~0.2-1 μm.
• CAT-3 (Moderate): Clear catch (SC-2) on representative lines; minor chip flanks and/or modeled micro-texture; noticeable at standard view. Indicative depth: ~1-5 μm.
• CAT-4 (Severe): Rough, bright chip flanks, peppered pits/craters, or broad matte sectors within the cluster; distinct at standard & wide-field views. Indicative depth: ≥5 μm.
• CAT-5 (by location/condition): Between-pane/inaccessible by parallax, or integrity indicators (active cracks, moving pane) → CAT-5; document and refer.

CAT assignment is appearance-based; acceptance is separate (VIS §6). Do not use MSRT to “probe.”

• vs. Linear scoring / tracks (M.01): M.01 shows extended, continuous lines (sometimes pane-spanning); FD clusters are localized with short lineations.
• vs. Micro-abrasion swirls / pad trails (M.02.01): Swirls are looped/curvilinear; FD clusters are straight, co-oriented lines.
• vs. Residue films/overspray (R-family): Residues change with reveal and read SC-0; true FD lines persist and can read SC-1/SC-2.
• vs. Coating anomalies (Co-family): Coating rub/patchiness is area-based, typically SC-0/SC-1 and lacks chip flanks; visible anomalies on a worked coated surface are not permitted at acceptance.

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique, include raking macros that resolve individual line edges (confirm presence/absence of chip flanks) and at least one context frame showing the cluster’s confinement (not pane-spanning). Record distance/angle in-frame.
• MSRT result: Record SC class (SC-0/1/2) with one light, non-marring pass on a representative line; polymer stylus on suspected coated faces. MSRT is supportive only.
• Forms: Pane ID; product family & surface numbering (#1-#4; laminate-internal); worked surface Y/N; functional coating on worked surface? (Y/N/Unknown); reveal status; lighting/time; geometry checklist; photos attached.
• Acceptance split: VIS §6 governs post-restoration appearance; classification ≠ acceptance. Transition edges and coating anomalies remain disqualifying per category criteria.

• M.05.01 FD Scratch Cluster - Short (localized). Hand-sized patch of short, co-oriented fine lines on surface #___; MSRT = SC-[1/2] on representative lines; chip flanks [absent/present]. Visible at [12/36/72 in] under VIS geometry after Non-Invasive Reveal. Classification: CAT-[2/3/4] by morphology + MSRT; if between-pane/inaccessible → CAT-5. Forms + photo set completed per VIS.