DSS-U.01.02 — Modeled Micro-Texture with Embedded Particulates (Uncertain Chemistry)

Modeled micro-texture with embedded particulates is an appearance change in which a subtle, non-directional matte field is accompanied by discrete specks that appear embedded or partially seated in the surface. The presentation suggests chemical softening/attack (acidic, alkaline, or mineral) combined with particle deposition/impingement, but the exact chemistry is uncertain. Classification is appearance-only per VIS (method-agnostic). Inspect after Non-Invasive Reveal under VIS lighting/geometry; record surface numbering and worked-surface status.

• Low-contrast “milky” modeling over a patch or panel with peppered fine dots (dark or light) scattered within the field.
• Specks range from <0.5 mm to ~2 mm apparent diameter; some show tiny shadows or micro-divots at center under raking.
• Often no gravity-driven runs or wipe paths; field edges can be soft/irregular.

Surface-catch class (MSRT)

• SC-1 across the modeled field (incipient micro-texture).
• SC-2 (pin-point) at individual raised particulates or micro-divots where a stylus crosses a protrusion or craterlet.
• Perform one light, non-marring pass on a small revealed test patch, sampling (a) clean glass control, (b) field matrix, and (c) several specks. Use a polymer stylus if a functional coating is suspected. MSRT supports classification only.

Visual signature

• Non-directional matte (no swirl/line patterning) with random speck distribution; specks may be dark (entrained fines) or light (etched pin-craters).
• No chip-flank linear grooves (not scoring); no fused hemispherical nodules typical of hot particle if true fusion is absent-verify carefully under raking.
• Under raking, some specks show tiny radial micro-chipping or a minute depression.

Viewing / lighting

• Evaluate clean & dry at 12 / 36 / 72 in, normal and oblique sweep (~60°-120°); use low-angle raking and specular reflection to separate matte field from speck relief. Record distances/angles in-frame.

Location / access

• Record pane ID and surface numbering (#1-#4; laminate-internal). Common on outboard (#1) in construction/industrial exposures; between-pane mapping by parallax on #2/#3 → CAT-5 by location.

Mechanism cue (context)

• Nearby cement/mortar work, industrial fallout, spray booths, road/rail dust, or cool night dew cycles that could set fines into a chemically softened surface. Lack of welding/grinding activity argues against hot particle as the dominant cause.

Assign CAT by visibility at acceptance geometry and MSRT. Depth values are indicative-field measurement not required.

• CAT-2 (Light): Small patch; SC-1 matrix with sparse specks (few per 100 cm2); limited standard-view impact. Indicative relief: field ~10-40 μm, speck high/low points ~20-60 μm.
• CAT-3 (Moderate): Pane-noticeable patch/panel; SC-1 matrix with numerous specks (tens per 100 cm2) legible at standard distance. Indicative relief: field ~40-120 μm, specks ~60-150 μm.
• CAT-4 (Severe): Wide-area field with dense peppering visible at standard and wide-field views; frequent SC-2 pin-points; occasional micro-divots. Indicative relief: field ~120-200 μm, local speck maxima ~150-300+ μm.
• Reclassify when (component rules):
• Discrete fused hemispherical beads with metallic tint → Th.01.02 grinder spark embed.
• Crystalline ring halos / drip geometry → Ch.03 mineral system (Deposits/Staining/Etching).
• Uniform granular frost within mask edges → V.01.01 abrasive blast.
• Linear grooves with chip-flank sparkle → M.01 scoring / M.02 abrasion fields.
• CAT-5 (by condition/location): Between-pane/inaccessible by parallax, integrity indicators, or confirmed functional-coating loss on the surface to be worked → CAT-5.

CAT is appearance-based; acceptance is separate under VIS-A at 12/36/72 in. Do not abrade to “force” a response during classification.

• vs. Hot particle peppering (Th.01.02): Hot particle shows fused, often metallic-colored nodules and distinct craters; this condition often has non-fused fines or very shallow micro-divots without metallic cues.
• vs. Dust-storm micro-pitting (E.02.02): Eolian pitting is directionally biased (wind-ward) and frequently gradient-based; U.01.02 lacks strong directionality and pairs with modeled matte.
• vs. Mineral etch (Ch.03.03): Mineral etch displays ring/flow halos; U.01.02 specks are random, with no consistent drip/run geometry.
• vs. Coating anomalies (Co): Coating issues are planar/patchy, face-specific, and do not present embedded specks; confirm coated face before attribution.

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique; raking macros isolating field matte and multiple specks (include one with apparent micro-divot); overview frames showing extent and uniformity. Record distance/angle in-frame.
• MSRT results: After a small reveal test patch, record SC-class for control (SC-0), field matrix (SC-1), and specks (SC-2 where present).
• Forms: Pane ID; product family & surface numbering; worked surface Y/N; functional coating on worked surface? (Y/N/Unknown); reveal status; lighting/time; geometry checklist; photos attached.
• Acceptance split: Post-restoration acceptance per VIS-A §6; classification ≠ acceptance. Coated-face appearance rules apply per VIS §6.2.e when the worked surface is a factory functional coating.

• U.01.02 Modeled Micro-Texture with Embedded Particulates - Low-contrast matte field with scattered embedded/partially embedded specks on surface #___; post-reveal test patch shows SC-1 matrix and SC-2 at select specks; visible at [12/36/72 in] under VIS geometry. Morphology: non-directional modeling, random peppering, no fused metallic nodules, no linear chip-flank grooves. Classification: CAT-[2/3/4] by visibility and SC-class; reclassify per notes if hot-particle, mineral, blast, or abrasion signatures dominate; CAT-5 if between-pane or coating-side loss on the surface to be worked. Forms + photo set attached; acceptance per VIS-A §6.