DSS-P.01.05 — Edge Kink / Localized Warp

A localized departure from flatness concentrated near an edge or corner of a lite-commonly a small “kink” or short-wavelength warp attributable to manufacturing/handling processes (e.g., heat-treat cooling, conveyor/edge support, post-process handling). It alters straight-line reflections/transmission near the edge zone but does not present as a discrete surface-relief defect at the exposed surface. VIS geometry is used to observe only; factory flatness/shape acceptance is governed by product standards/project specs, not by VIS post-restoration acceptance.

• Local edge zone where mullion/horizon reflections kink or bend over a short run; effect diminishes a few inches into the lite.
• No visible transition edge of a worked area; pattern is shape-related, not a ring or halo.
• Non-responsive to Non-Invasive Reveal; persists after clean/dry. Evaluate at VIS normal + oblique sweep and 12/36/72 in distances.

Surface-catch class (MSRT):

• SC-0 (none). Make one light, non-marring pass; no tactile interruption should be felt because this is shape, not local relief. Do not repeat/abrade.

Morphology:

• Localized flatness/shape deviation near edge; no chip flanks, pits, or modeled micro-texture. Classification remains observation-based; do not confuse with edge chipping (see M.03).

Viewing/lighting:

• Use VIS raking light and oblique sweep (~60°-120°) to read the optical bend; document at 12/36/72 in per VIS.

• Not field damage. When SC-0 and morphology indicate a shape feature (no local relief), record “Processing Feature - Not Surface Damage (outside CAT-1...CAT-4)”.
• If apparent distortion is determined to be inside an IGU cavity or otherwise inaccessible, document fixed parallax and record CAT-5 (out of in-place scope by location/condition).

N/A as a local surface-relief metric. Edge kink/localized warp is a shape/flatness issue; no micrometre relief is detected at the exposed surface via MSRT (SC-0).

• vs. Bow/Warp (P.01.02): Bow/warp is global curvature across the pane; edge kink is localized near the perimeter. Both are SC-0 and non-relief.
• vs. Roller Wave (P.01.01): Roller wave is periodic and often extends across the lite; edge kink is a short, non-periodic local bend. Both are factory shape features.
• vs. Edge micro-chipping / clamshell (M.03): Edge damage shows fracture morphology and, when accessible, may show clear catch; edge kink shows no catch and no fracture cues.
• vs. Frame/setting block distortion: Bent mullions or improper setting can mimic edge warp. Compare across adjacent lites and capture reference straight-edge in photos at VIS geometry.

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique; include a straight reference (string line/mullion/edge rule) skimming the affected perimeter to show local bend; note raking used Y/N.
• MSRT: Record SC-0 (none); one pass only; non-marring.
• Forms: Pane ID; surface numbering (#1-#4; laminate-internal), product family, coating on worked surface? (Y/N/Unknown), reveal status, lighting notes/time.
• Acceptance split: VIS governs post-restoration acceptance; factory tolerance/product specs govern flatness/shape at manufacture. Do not conflate.

• P.01.05 Edge Kink / Localized Warp (Processing Feature) - Local perimeter flatness deviation observed at VIS geometry; MSRT = SC-0 (no surface relief). No transition edge or fracture morphology. Recorded as manufacturing/shape feature; not categorized as surface damage under VIS-DA. If fixed parallax confirms cavity location, record CAT-5 and refer per project protocol