DSS-M.02.03 — Directional Webbing (repetitive paths)

A repeating, directional network of fine lines formed by a tool, pad, or abrasive traversing the glass in overlapping, semi-regular paths, producing a “spider webbed” pattern (linear/curvilinear strands with recurring orientation). Under raking light, strands may show edge sparkle; at higher severity, portions exhibit modeled micro-texture (subtle milky relief) and chip-flanks on some strokes. Apply VIS terminology for directional patterning, modeled micro-texture, micro-chipping / chip flank, MSRT (surface-catch), and VIS viewing/lighting; classification is appearance-based.

• Semi-regular strands (sometimes grid-like or mesh-like) with dominant direction and secondary cross-paths, spanning hand-sized patches or larger zones.
• Strongest in raking & oblique views, persists after Non-Invasive Reveal (clean & dry). Field Identification Cues (Normative)

Surface-catch class (MSRT):

• Commonly SC-1 for shallow webbing; SC-2 (clear) where strands exhibit chip-flanks or tactile lineation. Conduct one light, non-marring pass only; MSRT supports classification, not acceptance. Use polymer stylus if a functional coating may be present.

Reveal / lighting / geometry:

• Perform Non-Invasive Reveal; then evaluate at 12 / 36 / 72 in, normal incidence + oblique sweep (~60°-120°), under raking light; record distances/angles in-frame.

Location / access:

• Confirm the cue is on the exposed face. In IGUs, use parallax-fixed parallax indicates a between-pane condition; record surface numbering #1-#4 / laminate-internal on Forms: If between panes/inaccessible → CAT-5 by location.

Assign CAT via VIS visibility convention + MSRT outcome + edge/morphology (three-part cueing):

• CAT-1 - Faint: SC-0 / SC-1, non-tactile webbing; reads mainly in raking light; no chip-flanks, does not localize at acceptance geometry.
• CAT-2 - Light: SC-1, clean-edged fine lineation; limited visibility at standard view.
• CAT-3 - Moderate: Portions show SC-2 (clear) and/or modeled micro-texture noticeable at standard distance.
• CAT-4 - Severe: SC-2 (clear-to-strong) with rough chip-flanks, pits/craters, or broad matte/frosted sectors distinctly visible at standard and wide-field views.

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

• CAT-1: ~0-0.2 μm (non-tactile web; tone/shine change only).
• CAT-2: ~0.2-1 μm (fine directional strands; minimal edge breakout).
• CAT-3: ~1-5 μm with incipient micro-chipping on some strands.
• CAT-4: ≥5 μm with rough chip-flank segments and local pits/craters. (Depths are illustrative for cueing only; VIS classification/acceptance remains appearance-based.)

• vs. Cross-hatch scuffing (M.02.02): Cross-hatch is a lattice/X-weave of intersecting strokes; directional webbing shows dominant travel paths with more mesh-like continuity.
• vs. Micro-abrasion swirls (M.02.01): Swirls are looped/curvilinear clusters; webbing is path-oriented with repetitive, directed strands.
• vs. Residue films/overspray (R-family): Residues change with Non-Invasive Reveal; true mechanical webbing persists.
• vs. Coating anomalies (Co-family): Coating rub/patchiness is area-based, typically SC-0/SC-1 and lacks chip-flanks; visible anomalies on the worked surface are not permitted at acceptance.
• vs. Between-pane cues (A-family): Internal features show fixed parallax → CAT-5 by location.

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique, include raking; add macro frames of strand geometry and edge morphology (presence/absence of chip-flanks), and show no worked transition edge. Record reveal status, lighting, time; annotate distance/angle in-frame.
• MSRT result: Record SC class (SC-0 / SC-1 / SC-2 as observed); one pass, non-marring; for suspected coated faces, prefer polymer stylus or rely on visual cues.
• Forms: Pane ID; surface numbering (#1-#4 / laminate-internal); worked surface Y/N; functional-coating on worked surface? (Y/N/Unknown); viewing-geometry checklist; photos attached-per VIS Appendix X3.

• Do not “feather” or “blend” the web during inspection-this creates a worked region/transition edge that VIS disallows at acceptance for CAT-0...CAT-4. Keep evaluation non-marring and appearance-only.

• M.02.03 Directional Webbing (repetitive paths) - Directional strand network at #__ confirmed after Non-Invasive Reveal; MSRT = SC-0/SC-1/SC-2; chip-flanks absent/present (record). Classified CAT-1/2/3/4 by visibility and flank severity per VIS. Photo set at 12/36/72 in (normal + oblique + raking); surface numbering and form fields recorded. Acceptance per VIS §6 (appearance-based).