ICUX-003 · atlas / knowledge layer

Materials & Matter Observatory

Twenty material dossiers connect composition, visible behavior, use and conservation context—then let you compare three materials without stripping away units, test conditions or uncertainty.

20 dossiers5 cross-universe passportssource-backed documentary textoriginal interpretive visuals

Browse dossiers Build comparison

Truth boundary. Documentary claims are tied to visible sources. Every material-pattern graphic on this page is an original interpretive diagram, not a specimen image, micrograph, test result or archival artifact. Educational selection only; no engineering suitability certification.

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Family

Property

Material passport library

The same matter, different worlds.

A bike frame, a bed frame, a facade and a sculpture can all invoke “metal” while meaning different grades, finishes, loading histories and care problems. These passports keep those distinctions visible.

20 of 20 material dossiers shown

Architecture & Places materials library ↗

metal

Aluminum

Composition. Aluminum-based metal; exact alloying additions and heat treatment vary by grade.

Architecture Bikes Art Objects

Density: 2.7 g/mLNIST selected-metal reference at 295 K.
Thermal conductivity: 235 W·m⁻¹·K⁻¹NIST selected-metal reference at 295 K.
Linear thermal expansion coefficient: 22.91 10⁻⁶/KNIST selected-metal reference at 295 K.

Conservation lens. Treat as alloy- and finish-specific. Corrosion behavior depends on environment and contact with other materials; heritage surfaces should not be aggressively altered without a conservation reason.

Deep link

National Institute of Standards and Technology (NIST)Canadian Conservation Institute

metal

Copper

Composition. Copper metal; commercial purity and working history vary.

Architecture Bikes Art Objects

Density: 8.96 g/mLNIST selected-metal reference at 295 K.
Thermal conductivity: 400 W·m⁻¹·K⁻¹NIST selected-metal reference at 295 K.
Linear thermal expansion coefficient: 16.66 10⁻⁶/KNIST selected-metal reference at 295 K.

Conservation lens. Patina and corrosion layers can be historically significant. Cleaning/polishing decisions should be conservative and context-specific.

Deep link

National Institute of Standards and Technology (NIST)Canadian Conservation Institute

metal

Brass · 70 Cu / 30 Zn reference

Composition. Copper-zinc alloy; this dossier uses NIST’s explicitly named 70% Cu / 30% Zn reference entry for measured properties.

Architecture Bikes Art Objects

Density: 8.5 g/mLNIST reference entry “Brass (70 Cu 30 Zn)” at 295 K.
Thermal conductivity: 120 W·m⁻¹·K⁻¹NIST reference entry “Brass (70 Cu 30 Zn)” at 295 K.
Linear thermal expansion coefficient: 18 10⁻⁶/KNIST reference entry “Brass (70 Cu 30 Zn)” at 295 K.

Conservation lens. Copper-alloy care is surface- and history-dependent; avoid assuming a bright polish is the correct conserved state.

Deep link

National Institute of Standards and Technology (NIST)Canadian Conservation Institute

metal

Stainless steel 304 · reference entry

Composition. NIST selected-metal table entry “Stainless Steel 304”; exact product chemistry and processing can vary beyond this reference label.

Architecture Beds Bikes Art Objects

Density: 8.0 g/mLNIST “Stainless Steel 304” selected-metal reference at 295 K.
Thermal conductivity: 15 W·m⁻¹·K⁻¹NIST “Stainless Steel 304” selected-metal reference at 295 K.
Linear thermal expansion coefficient: 15 10⁻⁶/KNIST “Stainless Steel 304” selected-metal reference at 295 K.

Conservation lens. “Stainless” does not mean maintenance-free. Surface contamination, salts, crevices and environment can matter; preserve intended finish when caring for heritage objects.

Deep link

National Institute of Standards and Technology (NIST)Canadian Conservation Institute

metal

Carbon steel

Composition. Iron-carbon alloy family; chemistry, heat treatment and coating vary widely by grade and product.

Architecture Beds Bikes Art Objects

Composition class: Iron-carbon alloy family; do not infer grade-specific strength from this dossier.Visual/material-class description; exact grade, finish and processing can change behavior.
Corrosion sensitivity: Unprotected iron/steel surfaces can corrode; storage and surface condition matter.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Plain carbon-steel heritage objects can corrode; moisture, salts, coatings and contact materials all affect care.

Deep link

Canadian Conservation Institute

wood

Oak wood

Composition. Hardwood material with cellular wood structure; species, cut, growth conditions and moisture content affect behavior.

Architecture Beds Art Objects

Moisture response: Hygroscopic; dimensional behavior depends on moisture content and grain direction.Visual/material-class description; exact grade, finish and processing can change behavior.
Structure: Anisotropic cellular material; “oak” still spans multiple species and cuts.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Wood is hygroscopic: changes in surrounding humidity can drive moisture change, swelling/shrinkage and stress. Light, insects, water and poor handling also matter.

Deep link

USDA Forest Service, Forest Products Laboratory Canadian Conservation Institute

wood

Pine wood

Composition. Softwood family with cellular wood structure; species, growth ring pattern, cut and moisture content vary.

Architecture Beds Art Objects

Moisture response: Hygroscopic; moisture exchange with air depends on relative humidity, temperature and current moisture content.Visual/material-class description; exact grade, finish and processing can change behavior.
Structure: Anisotropic cellular softwood; species and growth conditions change properties.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Humidity-driven dimensional change, light, insects and water exposure can affect wooden objects. Historic finishes may be significant.

Deep link

USDA Forest Service, Forest Products Laboratory Canadian Conservation Institute

wood composite

Plywood

Composition. Layered wood veneers bonded with adhesive; veneer species, ply count, adhesive and panel grade vary.

Architecture Beds Art Objects

Structure: Layered veneer composite; orientation of adjacent plies is intentionally varied.Visual/material-class description; exact grade, finish and processing can change behavior.
Moisture response: Wood-based and humidity-responsive; panel performance depends on grade, adhesive and exposure history.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. It inherits wood’s moisture sensitivity while adhesive system and veneer construction add product-specific behavior. Avoid assuming all plywood performs alike.

Deep link

USDA Forest Service, Forest Products Laboratory Canadian Conservation Institute

mineral composite

Concrete

Composition. Man-made composite of cement, sand, gravel/aggregate and water; hardened structure develops through hydration.

Architecture Art Objects

Composition class: Cement + sand + gravel/aggregate + water; proportions and cement system vary by concrete.Visual/material-class description; exact grade, finish and processing can change behavior.
Mechanical profile: Generally strong in compression relative to tension; reinforcement may be used to address tensile demands.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Historic concrete is mix- and exposure-specific. Water movement, cracking, embedded reinforcement and prior repairs should be evaluated before treatment.

Deep link

U.S. National Park Service

ceramic/masonry

Fired brick

Composition. Manufactured masonry unit made from clay-bearing raw materials such as clay, sand and shale, transformed by firing.

Architecture Objects

Composition class: Clay-bearing raw materials are fired into a ceramic masonry body.Visual/material-class description; exact grade, finish and processing can change behavior.
Moisture risk: Water entry and freeze-thaw can be damaging, especially after surface loss or incompatible treatment.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Moisture is a major deterioration driver in historic brick; abrasive cleaning can remove harder outer surfaces, and impermeable coatings can trap moisture.

Deep link

U.S. National Park Service U.S. National Park Service

glass/ceramic

Soda-lime-silica glass

Composition. Silica-based glass family modified by fluxes and stabilizers; exact oxide proportions vary by product and standard.

Architecture Art Objects

Mechanical profile: Hard and brittle; impact can produce cracks or fracture.Visual/material-class description; exact grade, finish and processing can change behavior.
Composition class: Silica + flux/stabilizer glass family; exact formulation controls important behavior.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Glass is hard but brittle. Chemical stability depends partly on formulation; deteriorated glass can show cloudiness, iridescence or “weeping,” and should not be treated as robust modern glass by default.

Deep link

Canadian Conservation Institute

stone

Marble

Composition. Metamorphic stone dominated by carbonate minerals in many common building/sculpture marbles; composition and texture vary.

Architecture Art Objects

Composition class: Carbonate-stone family; calcite is calcium carbonate (CaCO₃).Visual/material-class description; exact grade, finish and processing can change behavior.
Treatment boundary: Cleaning/repair should be selected from actual stone, finish, soiling and deterioration—not a generic “stone” recipe.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Stone treatment must follow stone type and condition. Carbonate stones can weather differently from silicate-rich stones; cleaning and repair should avoid erasing historic surface.

Deep link

U.S. Geological Survey Canadian Conservation Institute

stone

Granite

Composition. Coarse-grained intrusive igneous rock dominated by quartz and feldspar with smaller amounts of other minerals.

Architecture Art Objects

Composition class: Predominantly quartz + feldspar with minor mafic/mica minerals depending on granite.Visual/material-class description; exact grade, finish and processing can change behavior.
Structure: Interlocking visible mineral grains; actual mineral proportions vary from granite to granite.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Granite is often durable, but surface finish, joints, salts, water and prior treatments still govern conservation decisions.

Deep link

U.S. National Park Service U.S. Geological Survey

mineral binder

Gypsum plaster / plaster of Paris

Composition. Powdered calcium-sulfate material mixed with water to set and harden; additives and finishes can change behavior.

Architecture Art Objects

Moisture response: Bare plaster is porous/hygroscopic and can stain with water contact.Visual/material-class description; exact grade, finish and processing can change behavior.
Embedded-metal risk: Corrosion of embedded iron/steel can expand and crack surrounding plaster.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Bare plaster can be porous and hygroscopic. Embedded iron/steel near the surface can corrode and expand, cracking/staining plaster; water cleaning can create tide lines.

Deep link

Canadian Conservation Institute Canadian Conservation Institute

textile

Cotton textile

Composition. Plant-fiber textile material; yarn, weave/knit structure, dyes, finishes and blends can substantially change behavior.

Beds Art Objects

Structure: Fibers assembled into yarn/fabric; weave, knit or non-woven construction changes behavior.Visual/material-class description; exact grade, finish and processing can change behavior.
Light sensitivity: Textile damage from light is cumulative; dyes and fibers differ in sensitivity.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Textiles are sensitive to cumulative light exposure, inappropriate humidity, pests, pollutants and handling; object construction and dyes/finishes matter.

Deep link

Canadian Conservation Institute

textile

Wool textile

Composition. Animal-fiber textile material; fiber quality, yarn construction, weave/knit, dye and finish vary.

Beds Art Objects

Structure: Animal fibers assembled into textile structures; yarn/fabric architecture strongly changes performance.Visual/material-class description; exact grade, finish and processing can change behavior.
Pest risk: Textile collections require pest-aware preventive care.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Like other heritage textiles, wool objects are sensitive to light, humidity, pests, pollutants and handling; storage/support should follow actual condition and construction.

Deep link

Canadian Conservation Institute

biological/processed

Leather

Composition. Processed animal skin dominated by collagen-fiber networks; tanning, species and finishing methods substantially change behavior.

Beds Bikes Art Objects

Structure: Collagen fibers form a network whose processing controls many final qualities.Visual/material-class description; exact grade, finish and processing can change behavior.
Processing variability: Species, tanning and finishing method are major sources of material variability.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Leather can stiffen, embrittle, powder or deform as it ages. Support, pollutant control and separation from reactive metals may matter; treatment must match tanning/process history.

Deep link

Canadian Conservation Institute

polymer/foam

Polyurethane foam

Composition. Cellular polymer foam family; flexible and rigid formulations differ, as do additives and aging pathways.

Beds Art Objects

Structure: Cellular polymer foam; open/closed cell character and formulation vary by product.Visual/material-class description; exact grade, finish and processing can change behavior.
Aging variability: Polymer deterioration rates and pathways can be highly formulation- and environment-dependent.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Plastics and foams can deteriorate chemically and physically at widely varying rates. Identification and formulation matter before selecting storage or treatment.

Deep link

Canadian Conservation Institute

polymer

Acrylic sheet · PMMA family

Composition. Transparent thermoplastic family commonly called acrylic; grades, additives, coatings and fabrication history vary.

Architecture Art Objects

Optical character: Transparent thermoplastic sheet family; surface scratches and coatings can dominate appearance.Visual/material-class description; exact grade, finish and processing can change behavior.
Aging variability: Plastic aging varies by polymer formulation, additives and environment.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Modern plastics require identification before treatment: different polymers and additives age differently, and cleaning/solvent choices can be material-specific.

Deep link

Canadian Conservation Institute

fiber composite

Carbon-fiber reinforced polymer

Composition. Polymer matrix reinforced with carbon fibers; fiber form/orientation, resin chemistry, layup and cure drive properties.

Architecture Bikes Art Objects

Structure: Carbon reinforcement embedded in a polymer matrix; fiber orientation and layup are fundamental variables.Visual/material-class description; exact grade, finish and processing can change behavior.
Environmental aging: Matrix/interface behavior can change with UV, moisture, temperature and other exposures.Visual/material-class description; exact grade, finish and processing can change behavior.

Conservation lens. Composite durability is a system problem: polymer matrix and fiber/matrix interface can be sensitive to UV, moisture, temperature and service history. Damage can be difficult to judge from appearance alone.

Deep link

National Institute of Standards and Technology (NIST)National Institute of Standards and Technology (NIST)

Three-material comparison

Compare without flattening context.

Numeric properties retain their original units and named test conditions. A missing property is shown as Unknown; categorical descriptors never occupy numeric cells.

Add up to three dossiers from the cards above. Your selection is reflected in the URL for a direct/deep link.

How to read the observatory

Three layers, kept separate.

Measured property

A numeric value only appears when a source-visible measurement or reference entry is carried with its unit and test context. The 295 K metal reference values are intentionally not generalized to every alloy/product bearing the same everyday material name.

Categorical descriptor

Structure, moisture response and conservation notes remain text. They are never squeezed into fake numeric scores or combined with measured values in one scale.

Unknown

If this candidate does not have a defensible, source-specific value, it says Unknown. The absence is data—not a cue to infer an average from a different grade or test method.

Cross-universe passport

Application links show where the same material class appears across ICU’s Architecture, Beds, Bikes, Art and object discovery surfaces. They are navigation relationships, not engineering recommendations.

Source ledger

Item-level factual anchors.

Reviewed 2026-09-12. These links are factual references only; this candidate does not redistribute their source photography or diagrams. Institution, identifier/scope and rights handling remain visible instead of being collapsed into a generic bibliography.

Reference Tables: Physical properties of selected metals at 295 K

National Institute of Standards and Technology (NIST) · reviewed 2026-09-12

Representative density, thermal conductivity and linear thermal-expansion values for named metal entries at 295 K.

NIST NCNR Reference Tables · Reference-only factual source; no source media redistributed in this candidate.

Wood Handbook: Wood as an Engineering Material (Revised 2021)

USDA Forest Service, Forest Products Laboratory · reviewed 2026-09-12

Wood structure, moisture relations and the condition-dependence of physical properties.

FPL-GTR-282 · Reference-only factual source; no source media redistributed in this candidate.

Basic care – Furniture and objects made of wood