DSS-A.02.02 — Bubbles / Stringers (entrapped gas/voids in laminated interlayer)

Discrete bubbles (rounded voids) or stringers (elongate/filamentary voids) within the laminated interlayer (between plies). These are laminate-internal features-not on an exposed worked face-and are therefore not addressable in place; classification is location/condition-driven. Product/spec context for laminated glass: ASTM C1172; ISO 12543. Surface numbering: identify as laminate-internal (distinct from #1/#4 and IGU #2/#3 faces).

• Isolated, round entrapped gas pockets; or linear “stringers” oriented with cut/lay-up flow.
• Concentrated near edges/corners, along insert/print boundaries, or sporadically in field.
• No change after Non-Invasive Reveal of exposed faces; no worked transition edge on the face. (Reveal & inspection geometry per VIS §5.)

Location / access (primary):

• Confirm laminate-internal location. On project forms, record product family (laminated) and surface numbering (#1-#4; laminate-internal). Do not assign face numbers to laminate-internal interfaces unless a project spec requires it.

Surface-catch class (MSRT):

• SC-0 (none) on the exposed face(s). MSRT is a single, non-marring pass used only to support classification-not acceptance. Do not abrade.

Inspection environment / reveal controls:

• Perform Non-Invasive Reveal (clean & dry) prior to 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. Back-lit frames can help show void boundaries.

• CAT-5 - Out of in-place scope when features are laminate-internal (not on an exposed worked surface). Document and refer per project protocol (fabricator/manufacturer/warranty).

• Not applicable to the exposed face (no measurable surface relief; SC-0). Numeric μm depth ranges apply to face-side defects only.

• vs. Seeds/blisters in float glass (P.02.02): Factory gas inclusions within monolithic glass; encapsulated and SC-0 on the face; classify under processing feature entries, not laminated interlayer.
• vs. Adhesive/film domes (R-family) on #1/#4: Face-side residues respond to Non-Invasive Reveal; laminate-internal bubbles do not.
• vs. Local delamination (A.02.06): Delamination often shows defined boundary (Newton fringes/iridescence) or creep; bubbles/stringers are discrete voids without broad separation. (Use VIS geometry + reveal to separate.)

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique, raking; add one back-lit close-up (when safe) to show void boundaries.
• 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.
• Measurements (if requested): Approximate void size (mm), count per area, and distance from edge; note temperature/RH at time of inspection (for reproducibility). (Use VIS forms fields; add notes.)

Attempting “spot-work” on the face to address an internal void risks creating a worked region (visible transition edge) that VIS disallows at acceptance for CAT-0...CAT-4. Keep classification appearance-only and location-based; refer.

• A.02.02 Bubbles/Stringers (laminate-internal) - Discrete voids within interlayer; no change after Non-Invasive Reveal; MSRT = SC-0 on exposed faces; documented at 12/36/72 in with normal + oblique under raking. CAT-5 (laminate-internal; out of in-place scope). Refer per project protocol.