DSS-P.03.05 — Patterned / Textured Glass Relief (design)

Patterned/textured glass is manufactured with intentional surface relief (e.g., flutes, prismatic or pebbled textures) as an aesthetic/functional design. The relief is inherent to the product, not a worked-surface defect. Evaluate observations under the VIS inspection lighting/geometry; post-restoration acceptance of worked areas is governed by VIS and must not be conflated with factory/product acceptance for decorative glass.

Informative context: industry “how to view decorative glazing” guidance (NGA FB67-20) recognizes that decorative products have intentional textures/patterns and should be viewed with appropriate geometry and expectations.

• Uniform, repeating relief (linear, geometric, pebbled, ribbed), continuous over the lite.
• Contrast and apparent “grain” vary with angle and raking light; a non-invasive reveal (clean & dry) does not remove or change the relief.

Surface-catch class (MSRT):

• On the intended textured face, MSRT will sense design relief; do not abrade. One light, non-marring pass only; on coatings, prefer a polymer stylus or rely on visual morphology + location. MSRT supports classification only (not acceptance).

Visual signature:

• Non-directional, uniform relief without a worked transition edge; no chip flanks/pits typical of mechanical scoring or hot-particle attack. Use normal incidence and oblique sweep (~60°-120°) at 12 / 36 / 72 in under raking light.

Location/access:

• Record pane ID and surface numbering (#1-#4; laminate-internal); acceptance pertains to the exposed surface under evaluation.

• Processing/design feature - not surface damage. If the observation is uniform product texture with no transition edge and no damage morphology, record “Design Feature - Not Surface Damage (outside CAT-1...CAT-4).”
• Escalate when:
• A local worked region is visible on the textured face (e.g., a transition edge/ring, local directional patterning, chip flanks or pits/craters). → Classify under M- or Ch- families by morphology and assign CAT per VIS (appearance-only).
• The cue shows fixed parallax within an IGU (between-pane). → CAT-5 (out of in-place scope); refer per project protocol.

Decorative relief height is a product attribute, not a damage depth; numeric depth is not required for classification/acceptance of design texture. Acceptance for any worked area remains appearance-based (no transition edge, no directional patterning at required views).

• vs. Abrasion fields (M.02): Abrasion presents directional/web texture and may produce slight/clear catch; design textures are uniform and lack chip flanks.
• vs. Chemical etch (Ch.03/Ch.01): Etch shows modeled micro-texture and can create localization/halos; design texture is consistent and non-localized.
• vs. Coating anomalies (Co.01/Co.03): Coating rub/patchiness is a worked-surface anomaly and is not permitted on coated faces at acceptance (VIS §6.2.e). Decorative relief is product geometry, not a coating change.

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique; include raking frames showing uniform texture and context frames proving product continuity (not a localized worked patch).
• MSRT result: Record SC class (note: design texture may feel as relief; record without probing). One pass only; non-marring; on suspected coated faces, prefer polymer stylus or rely on visual cues.
• Forms: Pane ID; product family and surface numbering; worked surface Y/N; functional coating present on worked surface? (Y/N/Unknown); reveal status; lighting/time; geometry checklist.
• Acceptance split: Decorative glass viewing should follow the VIS distances/angles; coating anomalies and transition edges/directional patterning remain disqualifying in worked areas.

“Blending” or polishing a small patch on a textured face to “match” relief can create a worked region with a visible transition edge, which VIS disallows at acceptance. Do not attempt to “flatten” design relief.

• P.03.05 Patterned/Textured Glass Relief (Design Feature) - Uniform product texture observed at VIS geometry; no transition edge and no damage morphology (no chip flanks/pits). MSRT recorded without probing (supports classification only). Logged as design feature - not surface damage under VIS-DA. If any localized worked patch or coating anomaly is present on the inspected face, classify and evaluate per VIS Sections 4 & 6.