DSS-A.02.01 — Edge haze / whitening (laminated interlayer; PVB / ionoplast)

A milky, desaturated band or clouding that develops within the laminated interlayer zone near the perimeter, typically within a few millimeters to several centimeters of the edge. It is an internal condition (between glass plies) of laminated glass and not a worked-surface defect. Because it is laminate-internal, it is generally out of in-place restoration scope; document and refer. (Laminated glass & interlayer context: ASTM C1172; ISO 12543.

• Semi-opaque “whitening” ribbon along edges; may appear wedge-shaped or uneven in width around corners.
• Can grow/recall with humidity and temperature changes; does not respond to non-invasive reveal/cleaning.
• May co-present with micro-bubbles/stringers or with slight interlayer retreat at the edge.
• Readable at normal incidence and oblique sweep under raking light; often more visible at standard/wide-field views when back-lit. (Inspection geometry & raking light: VIS §5.3-§5.4.

• Surface-catch class (MSRT): None on either exposed face. One light, non-marring pass per VIS §5.5; do not abrade. (MSRT definition and use.
• Visual signature: Edge-parallel, diffuse whitening inside the laminate; no chip-flank sparkle, no pits/craters at the exposed face; persists after non-invasive reveal. (Reveal.
• Location / access: Laminate-internal (between plies). Record surface numbering for the lite(s) and note that the observation is laminate-internal rather than on #1/#4 faces. (Surface numbering & non-exposed surfaces.
• Diagnostic differentiators:
• vs. external eolian/cleaning haze: external fields show face-side cues and may produce surface catch or directional patterning; laminate whitening does not.
• vs. sealant/adhesive film: surface films respond to reveal; laminate whitening does not.
• vs. local delamination (A.02.06): delamination shows a defined boundary (often iridescence, Newton fringes) and may include discrete voids; edge whitening is diffuse without a sharp lensing boundary.

• CAT-5 (Out of in-place scope): Record as A.02.01 - Laminate-internal whitening (CAT-5) and refer to fabricator/manufacturer or replacement per project protocol. (CAT-5 scope & rationale.
• If any face-side damage is also present (e.g., mechanical scoring at the perimeter), classify that separately under the appropriate M-family item and assign CAT per VIS. (Three-part cueing & boundary guidance.

Not applicable (internal to laminate). Depth ranges in μm apply to worked-surface defects; laminated interlayer whitening has no meaningful face-side removal depth.

• Photos: overview of the lite; edge runs at mid-range; close-ups at raking light. Include one back-lit image when safe, to show internal character. (VIS documentation.
• Recording: pane ID, surface numbering (#1-#4 / laminate-internal), environment (temp/RH), width of whitening band at several stations. (Surface numbering & documentation prompts.
• Inspection conditions: confirm non-invasive reveal completed; inspect under VIS §5 lighting/geometry; MSRT recorded as none. (Reveal & geometry.

• Product/spec context: ASTM C1172 (laminated architectural flat glass); ISO 12543 (laminated glass series). (Listed in VIS references.
• VIS cross-refs: Terminology (laminated, non-exposed surface); §5 (inspection), §6 (acceptance), §4.2.6 (CAT-5). (Terminology & sections.