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ForMatter/Processes/finishing/Sandblasting (Abrasive Blasting)

proc_sandblasting

Sandblasting (Abrasive Blasting)

finishing · abrasive blasting, bead blasting, shot blasting, soda blasting, media blasting

highlast updated 2026-04-26

Compatible materials

Steel 1018 (Mild Steel)

Stainless Steel 304

Aluminum 6061

Soda-Lime Glass

Alumina (Aluminum Oxide, Al₂O₃)+ 14 more below

Compressed air shoots an abrasive — sand, glass beads, baking soda, walnut shell — at a surface to clean, etch, or texture it. The matte finish on most consumer-electronics aluminum is bead-blasted. Also strips paint, removes rust, and frosts glass.

Pneumatic propulsion of abrasive media against a workpiece. Media selection sets the result: silica sand (now restricted — silicosis hazard) for aggressive cleaning, glass bead for matte finish without dimensional change, aluminum oxide for cutting, soda for delicate stripping, walnut shell for organic-substrate cleaning.

Scale & Tolerance

scale (mm)5 – 50000
tolerance (mm)0.05
skillbeginner — operator wears respirator and stands at the cabinet
min skillbeginner
whereschool shopprofessionalindustrial
costvery low per part; capital cost low

Equipment

school shopyes — bench-top blast cabinets are standard shop equipment
professionalwalk-in blast booths, pressure-pot blasters
industrialshot-blast through-feed conveyors for steel descaling

Environmental

energy usemoderate (compressed air)
waste streamspent media + removed surface contaminants — must be characterized for hazardous-waste disposal
consumablesmedia (recyclable through several cycles), filter elements

Trade-offs

constraints · what is lost · what is gained

Float Glass (Architectural Soda-Lime)

constraints
- line-of-sight only — recessed corners blast lighter than face surfaces
- mask resolution sets pattern detail — vinyl mask down to ~0.5 mm; resist film down to ~0.1 mm
- thin substrates can warp from blast-induced stress (especially aluminum sheet)
what is lost
- blast-texture is uniform but flat — reads as "blasted" without subtlety
- over-blasted glass loses the etched detail and goes opaque
what is gained
- frosted-glass effect on transparent substrates without acid chemistry
- paint-prep texture in one operation
- stencil-masked decorative pattern repeatable at production speed

Plain language. Neutral framing — perfection is contextual, defined by use. Cf. Winchester, The Perfectionists (HarperCollins, 2018).

Compatible materials

Steel 1018 (Mild Steel)

Stainless Steel 304

Aluminum 6061

Soda-Lime Glass

Alumina (Aluminum Oxide, Al₂O₃)

Borosilicate Glass

Cartridge Brass (C26000)

14k Yellow Gold

18k Yellow Gold

Carrara Marble (Bianco Carrara)

Sterling Silver (925)

Stainless Steel 316L

Terrazzo (Cement-Bound Aggregate Composite)

Titanium Grade 5 (Ti-6Al-4V)

Tungsten (Pure / Tungsten Carbide)

Finishes this process produces

Bead-blast · matte

Sandblast (matte texture) · textured

Sandblast-frosted glass (mechanical frost) · translucent

Second life

reversibilitylow — the textured surface is permanent unless polished off (which removes material).

output recyclabilityyes

waste streams

spent grit (recoverable for several cycles in modern systems before disposal)
dust collection waste (silicosis hazard with silica grit; aluminum oxide / glass bead is the safer modern standard)
compressed air consumption

repair compatible withSandblasting (Abrasive Blasting)

OSHA Respirable Crystalline Silica standard 29 CFR 1910.1053; SSPC abrasive-blasting standards.

Citations

book · Lefteri, Making It: Manufacturing Techniques for Product Design, 2nd ed. (Laurence King, 2012), 'Sandblasting' p. 267.

Concordance

House vocabulary — terms ForMatter uses with intent.

anisotropic: Direction-dependent. Wood reads differently along the grain than across it; rolled steel is stiffer along the rolling direction. The Principled-BSDF anisotropic input rotates the highlight to match.
anodize: Electrochemical oxide layer grown on aluminum (Type II / III), titanium, or niobium. Type II accepts dye for color; titanium / niobium use voltage-driven thin-film interference instead of dye. The CMF entry covers the seal step that locks the color in.
application: What the thing IS, in the world. The third entity, peer of material and process. A water bottle, a chair, an extruded-aluminum profile.
BRDF: Bidirectional Reflectance Distribution Function. The math behind how a surface returns light for any incoming and outgoing direction. The PBR model is a parameterized BRDF.
channeled: A voice block written within a dead author's philosophy, marked and cited. Distinct from a verbatim quote. Roland Barthes channeled on PMMA reads like Barthes; the citation attributes the lineage.
CMF: Color, Material, Finish — the trio designers specify together when handing a part off for production. ForMatter's Finish entity is the F in CMF: 10 categories — polish / anodize / patina / plate / coating / texture / cut / mold_finish / glaze / stone_finish — and entries under each. Every finish entry pairs to the materials and processes it suits.
choral fugue: ForMatter's register. Subject stated plainly (freshman tier), answered in technical and sensorial registers, countersubjects from linked processes and applications, citations as final stretto. Voice blocks where canon attaches.
clearcoat: A second specular layer over the base surface. Glossy plastics and lacquered woods get a clearcoat term in the PBR table. IOR 1.5 by default.
compatibility (process): Each process entry lists which materials it can work. The cross-ref renders as sphere pills so the gallery feeling extends inward.
confidence: Each entry tagged high / medium / low. A senior's low-confidence-with-three-citations beats a freshman's high-confidence-with-none. The label is a contract with the reader, not a brag.
crystalline (finish): A faceted-surface read — gemstones, glassy minerals, ice. Drives PBR defaults: IOR 2.42 (diamond), transmission 1.0, low roughness.
derive_pbr(): The build's single source of truth — sphere palette + finish enum → Principled-BSDF starter values. One function feeds the entry-page table, the per-host snippets, the glTF export, and the Three.js Live Preview.
finish (entity): ForMatter's CMF layer — surface treatments and conditions a designer chooses for a given material and process. Categories: polish, anodize, patina, plate, coating, texture, cut, mold_finish, glaze, stone_finish. Distinct from the sphere `finish` enum (metallic / matte / glossy / etc.) which is the visual register of the proxy.
freshman / senior register: Two registers in every entry — the plain freshman description and the technical / sensorial one. Same database, two readers, no extra subscription.
glTF: GL Transmission Format — the open 3D-asset standard every modern app reads. ForMatter emits a .gltf material doc per material. Open standard, designer-friendly handoff.
IOR: Index of Refraction. How much light bends entering the surface. Air 1.0, water 1.33, glass 1.5, diamond 2.42. Drives transmission and the specular term.
iridescent (finish): Hue-shifted accent over base. Anodized titanium and niobium, opal, paraíba. Drives PBR defaults: low metalness, full iridescence, clearcoat.
iridescence: Thin-film interference layer over the base material. KHR_materials_iridescence in glTF, MeshPhysicalMaterial.iridescence in Three.js. Tunable from the FOCUS slider on iridescent / pearlescent entries. The ior and thickness range together set the visible color sweep — opal uses a 100–800 nm thickness range (film, not wavelength) to span the full visible band.
lite-PBR: ForMatter's PBR approach — Principled-BSDF starter values per entry, no measured BRDFs, no commercial assets. Reasonable defaults from the finish enum, per-entry numeric overrides where you have a real reason.
Live Preview: The Three.js shader ball that replaces the static CSS sphere on every entry page. One render path for every category — metals, woods, polymers, ceramics, paints, textiles, gemstones, glass. Same derive_pbr() values, real-time lit by a synthetic studio environment, draggable. Optional — toggle in Preferences.
material: What the thing is MADE OF. The first entity. Aluminum 6061, white oak, soda-lime glass.
metallic (finish): Specular highlight, deep shadow rim. Drives PBR defaults: metalness 1, low roughness, IOR 1.45. Polished steel, gold, copper.
mood board: Folded into the Project workspace at /project.html. The mood-board upload, palette extraction, character chips, and matcher results all live alongside the collected items grid and the save .formatter / save PDF / open .formatter actions — one feature, one page.
Ollama: Local-LLM scaffold on the Project page. Off by default. When toggled on in Preferences AND Ollama is reachable at localhost:11434, the natural-language input box ('something soft and warm with a wet read') asks the model to translate the description into character-chip toggles. Never invents material properties; the LLM only translates intent into existing chip vocabulary. The keyword fast-path (chips alone, no LLM) is the default — see suite-wide ai-integration pattern.
project: The full workspace at /project.html — collected materials, processes, applications, finishes plus an optional mood-board image whose dominant colors search the library for matches. Save / open .formatter files round-trip the project state.
patina: A chemical color shift on metal — heat-blue on steel, fume-black on silver, verdigris on copper, gun-blue on tool steel, ferric on copper. CMF-layer entry; cited by both the material and the process pages that produce it.
PBR: Physically-Based Rendering. The shading model every modern 3D app uses, parameterized by metallic / roughness / IOR / transmission / clearcoat / sheen. ForMatter publishes starter values for every material entry.
SPI mold finish: Society of the Plastics Industry mold-cavity finish standard. A1 / A2 / A3 (diamond polish, mirror), B1 / B2 / B3 (paper, semi-gloss), C1 / C2 / C3 (stone, matte), D1 / D2 / D3 (dry blast, textured). The finish prints from the mold cavity onto the molded part — a designer picks the SPI grade with the molder when specifying the tool.
Principled BSDF: Blender's name for the consolidated PBR shader. Most other apps ship the same shader under different names (Standard Surface, ShaderGraph, Substance). One node, every output.
process: How the material is MADE INTO the thing. The second entity. Cast, machined, kerf-bent, anodized, planished, granulated. Process is a peer of material, not a footnote.
quote: A voice block carrying a verbatim quotation from a living author, with citation. Distinct from a channeled block. Living = quote only; the rule is enforced at the schema layer.
roughness: Microsurface scatter. 0 is mirror-smooth; 1 is fully diffuse. Most real surfaces sit between 0.2 and 0.8.
sphere proxy: ForMatter's visible-character stand-in for every material. CSS-gradient driven by the entry's palette and finish, not a baked render. Honest about being a proxy, scales cheaply, tweakable in one place.
substitute: A peer material that could fill a similar role. Cross-references render as sphere pills inside an entry — the gallery feeling extends inward.
transmission: How much light passes through. 1 is fully transparent; 0 is opaque. Glass, gemstones, clear plastics carry transmission.
PVD: Physical Vapor Deposition — vacuum-chamber sputter or cathodic-arc deposition of a thin ceramic film onto a metal substrate. The CMF-layer's modern coating chemistry: TiN (gold), ZrN (champagne), CrN (pewter), TiCN (warm bronze / rose-gold), AlTiN (charcoal-anthracite, near-black), DLC (deep black). Hard, doesn't tarnish, paint-thin.
VDI 3400: German engineering reference standard for mold-cavity texture (Erodieren bearbeitete Werkstückoberflächen). The full scale runs reference plates 0–45 by Ra value; production specs typically draw from 12–45 because plates 0–11 require diamond-mirror polish on the mold cavity and are rarely commissioned in commercial tooling. Pairs with the SPI standard; both define what gets cut into the mold.
voice block: A versal block where a real authored voice attaches to the material or process. Schema-tagged with status (living / dead) and mode (quote / channeled). Citations always.
woodgrain (finish): Directional sheen with grain ring. Drives PBR defaults: anisotropic 0.6, medium roughness, no metalness. Every wood entry.

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Sandblasting (Abrasive Blasting)

Scale & Tolerance

Equipment

Environmental

Trade-offs

Second life

Citations

Further reading

Concordance

ForMatter

Why this exists

Sources

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