DSS-A.02.06 — Local Delamination (ply/interlayer separation; laminated glass)

Local delamination is a separation between a glass ply and the interlayer (or between interlayers) creating a void/air interface within the laminate stack. Presents as silvering, Newton-fringe iridescence, or a defined lens-like boundary inside the laminate. Because the cue is laminate-internal (between plies), it is not on an exposed worked face and is not addressable in place; classification is location/condition-driven. Product/spec context: ASTM C1172 and ISO 12543 (normative in VIS). Use VIS surface numbering and record as laminate-internal (distinct from #1/#4 and IGU #2/#3 faces).

• Sharp, closed boundary (crescent/amoeboid) showing silvering or rainbow fringes under oblique/raking light; often edge-originating and creeping inward.
• May appear around cutouts/inserts, at corners, or where thermal/UV load and moisture are elevated.
• No change after Non-Invasive Reveal of exposed faces; no worked transition edge on the face. (Apply VIS inspection geometry.)

Location / access (primary):

• Confirm laminate-internal location. On forms, record product family (laminated) and surface numbering (#1-#4; tag as laminate-internal). Do not re-number laminate-internal interfaces as IGU faces.

Surface-catch class (MSRT):

• On exposed faces, record SC-0 (none). MSRT is single, non-marring and supports classification only-do not abrade to “probe” an internal cue. Prefer polymer stylus on coated faces or rely on visual/location cues.

Inspection environment / reveal controls:

• Perform Non-Invasive Reveal (clean & dry) before evaluation; persistence confirms non-face location. Avoid blades/abrasives/chemicals prior to classification.

Viewing / lighting:

• VIS geometry: 12 / 36 / 72 in; normal incidence + oblique sweep (~60°-120°) with raking light. Add back-lit frames (when safe) to capture fringes/silvering.

• CAT-5 - Out of in-place scope when separation is within the laminate (not on an exposed worked surface). Document and refer per project protocol (fabricator/manufacturer/warranty).
• If face-side damage also exists (e.g., perimeter scoring), classify that separately under the appropriate M-family item and assign CAT per VIS.

• Not a face-relief feature. On the exposed face, MSRT records SC-0. Numeric μm ranges in VIS apply to face-side defects only.

• vs. Bubbles/stringers (A.02.02): Bubbles are discrete voids (round/linear) without pronounced fringe patterns; delamination shows defined separation boundary with silvering/iridescence.
• vs. Edge haze/whitening (A.02.01): Whitening is diffuse/milky; delamination has a sharp lens-like boundary and fringe effects.
• vs. Interlayer creep/exudation (A.02.04): Creep is material flow/exposure at the edge; delamination is ply/interlayer separation (air interface) within the stack.
• vs. IGU cavity anomalies (A.01 family): Cavity features sit on #2/#3 with fixed parallax between panes; delamination is within a laminate (record as laminate-internal). Use surface numbering to avoid cross-family mis-ID.

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique, raking; include at least one back-lit macro (when safe) to capture fringes/silvering and a context frame showing edge origin/extent.
• Forms: Pane ID; product family & surface numbering (#1-#4; laminate-internal); worked surface Y/N; functional coating present on worked surface? (Y/N/Unknown); reveal status; lighting/time; geometry checklist.
• Progression note: If observed across site visits, record growth/creep of boundary (mm and date) and any environmental conditions (temperature/RH, sunload).

Attempting face-side “blending” to hide an internal boundary creates a worked region (visible transition edge) that VIS disallows at acceptance (CAT-0...CAT-4). Keep classification appearance-only and location-based; refer, do not abrade.

• A.02.06 Local Delamination (laminate-internal) - Defined ply/interlayer separation with silvering/iridescent fringes inside the laminate; no change after Non-Invasive Reveal; MSRT = SC-0 on exposed faces; documented at 12/36/72 in with normal + oblique under raking (incl. back-lit macro). CAT-5 (laminate-internal; out of in-place scope). Refer per project protocol.