graphite
Enable an AI agent to recognise graphite, assess its material condition and suitability, and decide which handling, processing or use actions are justified by available evidence.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an AI agent to recognise graphite, assess its material condition and suitability, and decide which handling, processing or use actions are justified by available evidence.
Graphite is the layered crystalline allotrope of elemental carbon (dominant 2H polytype, space group P6₃/mmc, with a 3R rhombohedral stacking variant) in which sp² graphene sheets stack at about 0.335 nm by van der Waals cohesion; it is the thermodynamically stable form of carbon at ambient pressure and is extremely anisotropic in electrical, thermal and mechanical properties.
It can be Identify and classify a graphite specimen or lot using structural, compositional and provenance evidence.; Select representative samples and request tests that resolve identity, purity or performance uncertainty.; Assess whether milling, classification, purification, expansion or consolidation is appropriate for the recorded material.; Match graphite to a specified use using measured properties and explicit acceptance criteria.; Recommend continued use, further testing, reprocessing or segregation based on contamination and degradation evidence.; Specify material-dependent handling constraints for loose particles, flakes or consolidated bodies..
Distinguishing features
Determine whether diffraction and complementary structural evidence support graphite identity rather than relying on black colour, softness or electrical conductivity alone.
Check whether a material sold as graphene is a few-layer product, graphite nanoplatelets or bulk graphite; record the thickness evidence and classification convention.
Distinguish graphite from carbon black, char and poorly ordered carbon using structural evidence alongside morphology and processing history.
Determine whether the object is graphite material or a graphite-containing mixture by identifying binders, coatings and other phases.
Separate confirmed graphite identity from natural-versus-synthetic origin claims, which require their own provenance or analytical evidence.
Scope
+ Evidence identifying graphite and distinguishing it from other carbon materials and mixtures
+ Natural or synthetic origin and processing history affecting the graphite
+ Particle, flake, expanded or consolidated form and its internal structure
+ Carbon content, impurities, surface chemistry and contamination
+ Directional properties, degradation and suitability for a specified material use
- Graphite deposits, mine planning and extraction operations
- Graphene, diamond, carbon black and other separately identified carbon materials
- Complete batteries, electrodes, reactors and other graphite-containing devices
- Finished composites and formulations whose behaviour depends on multiple constituents
- Processing equipment, workplace exposure programmes and transport regulations
Characteristics
- Graphite identification confidence
- unverified | provisional | supported | disputed; methods and supporting observations Prevents trade names or appearance from being treated as sufficient identification.
- Origin and production route
- natural | synthetic | mixed | unknown; documented route Connects observed properties and variability to how the material was produced.
- Material form
- flake | powder | expanded material | consolidated body | other described form Determines which sampling, property measurements and processing actions are meaningful.
- Graphitic ordering
- method-specific diffraction or spectroscopic metrics, including test conditions and uncertainty Supports identity and distinguishes structural changes without reducing different methods to an unsupported universal score.
- Particle size and shape
- size distribution in µm; thickness in nm or µm; dimensionless aspect ratio; measurement basis Influences packing, dispersion, processing and the relevance of particle-versus-flake classifications.
- Carbon and impurity composition
- carbon in mass %; identified impurities in mass % or mg/kg; analytical method and reporting basis Allows use-specific purity assessment and prevents total carbon from being mistaken for graphite phase content.
- Surface condition
- as-produced | purified | coated | functionalised | oxidised | contaminated | unknown; supporting evidence Helps explain changes in wetting, interfacial behaviour and compatibility with further treatment.
- Density and porosity
- density in kg/m³ with bulk, tapped, skeletal or apparent basis; porosity in % with method Separates particle packing from internal voids and supports assessment of consolidated graphite.
- Directional transport properties
- electrical resistivity in Ω·m; thermal conductivity in W/(m·K); direction, temperature and specimen condition Prevents measurements from one orientation or form being transferred unjustifiably to another.
- Use qualification
- link to intended use, acceptance criteria, test evidence and applicable lot or specimen Makes suitability a supported relationship to a particular use rather than an intrinsic grade label.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 18 findings · 28 questions.
Graphite identity Establishes what evidence supports calling the material graphite and where neighbouring carbon classifications begin.
Appearance, carbon content and commercial naming alone do not establish the identity needed for reliable decisions.
Structural identification
Records observations used to identify graphitic structure and their limitations.
Graphite phase evidence
Captures the evidence supporting graphite identification and any unresolved competing interpretations.
- Which diffraction, spectroscopy or microscopy observations support graphite identification, and which specimen was examined? measurement
- Could the observations also describe poorly ordered carbon or a mixed carbon material, and what additional evidence would resolve that ambiguity? boundary
Material boundaries
Separates graphite identity from product names, neighbouring carbon materials and graphite-containing mixtures.
Graphite versus product label
Records the actual material represented by labels such as graphene, graphite nanoplatelets or graphite grade.
- What thickness, layer-count or structural convention distinguishes this material from a separately modelled graphene product? boundary
- Does this record describe graphite itself, a coated graphite material or a mixture containing graphite and other constituents? definition
Origin and transformation Connects graphite to its natural or synthetic origin and to treatments that establish its present state.
Materials with the same graphite label can have materially different histories that affect interpretation and subsequent processing.
Origin evidence
Records support for origin claims and whether the material combines multiple sources.
Natural, synthetic or mixed
Distinguishes documented origin from origin inferred from appearance or grade naming.
- What records support natural, synthetic or mixed origin, and can they be traced to this lot? provenance
- For natural material, what extraction and beneficiation history is known; for synthetic material, what precursor and graphitisation history is known? provenance
Processing history
Tracks treatments capable of changing graphite structure, particle form or surface condition.
Treatment sequence
Relates the current graphite state to purification, milling, thermal treatment, intercalation, expansion or coating.
- Which treatments were performed, in what sequence, and with what recorded reagents and thermal or mechanical conditions? provenance
- Which proposed next treatments require verification of residual reagents, coatings or previous structural changes? action
Form and internal structure Describes graphite at particle, crystallite and body scales without conflating their measurements.
Flake geometry, preferred orientation and void structure determine whether measurements and processing choices transfer between graphite forms.
Particle and flake geometry
Captures distributions of particle dimensions, shape and aggregation.
Size, thickness and aggregation
Distinguishes lateral flake size, thickness and agglomerate size in measurements of graphite particles.
- What lateral size, thickness and shape distributions were measured, using which methods and weighting conventions? measurement
- Do reported sizes represent individual graphite particles or agglomerates, and how did sample dispersion affect the result? measurement
Ordering, orientation and voids
Records internal organisation relevant to graphite powders and consolidated bodies.
Structure across scales
Separates crystallite ordering and preferred orientation from particle packing and internal porosity.
- What evidence describes graphitic ordering and preferred orientation, and how representative is it of the material? measurement
- Which density and porosity measurements distinguish spaces between particles from pores inside particles or a consolidated body? measurement
Composition and material condition Assesses graphite purity, surface modifications, contamination and changes caused by storage or service.
Graphite identity can remain valid while impurities or deterioration make the material unsuitable for its intended use.
Purity and surface chemistry
Distinguishes bulk composition, residual mineral matter and surface-specific chemistry.
Carbon, impurities and coatings
Records what purity claims include and which constituents could control use suitability.
- How were carbon content, ash and specific impurities measured, and are results reported on dry, as-received or another basis? measurement
- Which coatings, functional groups, moisture or processing residues are present, and what evidence distinguishes surface measurements from bulk composition? measurement
Degradation and contamination
Records changes relative to an established graphite condition or acceptance baseline.
Condition change
Assesses oxidation, wear, fracture or contamination using the material's exposure history and observations.
- What changes in mass, surface chemistry, particle distribution or body integrity are observed relative to the baseline? measurement
- Given recorded atmosphere, temperature and chemical or mechanical exposure, what evidence is needed before continued use or reprocessing? action
Performance and permitted actions Connects graphite properties to a specified use and to justified handling or processing decisions.
A graphite grade or isolated property value cannot establish suitability without form, test conditions and application requirements.
Conditioned property evidence
Records performance measurements with the orientation and specimen conditions necessary for interpretation.
Transport and mechanical response
Captures use-relevant electrical, thermal or mechanical behaviour without treating powder and body measurements as interchangeable.
- What electrical or thermal properties were measured, along which directions and at what temperature, density and contact conditions? measurement
- Which mechanical, friction or wear measurements are relevant to this graphite form, and under what loading and environmental conditions were they obtained? measurement
Use and processing decisions
Determines whether available material evidence supports a requested application or transformation.
Qualification and next action
Links decisions to explicit graphite acceptance criteria, representative evidence and remaining uncertainty.
- For the intended use, which graphite-specific limits on impurities, particle geometry, porosity or measured performance apply, and does this lot meet them? boundary
- Which next action is supported - use, additional testing, classification, purification, consolidation, reprocessing or segregation - and what material-dependent handling constraints apply? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Natural flake graphite
- Natural vein (lump) graphite
- Natural amorphous (microcrystalline) graphite
- Synthetic / Acheson graphite from petroleum or pitch coke
- Pyrolytic graphite and highly oriented pyrolytic graphite (HOPG)
- Expandable graphite and expanded / flexible graphite foil
- Spherical (and coated spherical) graphite for lithium-ion anodes
- Nuclear-grade polycrystalline graphite (moderator and reflector)
- Which of these kinds and varieties hold for the sense of graphite this model covers, and on what evidence? provenance
Identifiers and schemes
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Wikidata - Q5309 - Mineral and carbon allotrope; not the software or protocol senses of the same word.
- CAS Registry Number - 7782-42-5 - Commercial graphite; elemental carbon has other CAS numbers (e.g. 7440-44-0) that are not this substance.
- EC / EINECS - 231-955-3 - EU substance identity used in REACH dossiers.
- PubChem CID - 5462310 - Compound record for graphite.
- IMA mineral name - Graphite (C) - IMA-approved native-element mineral; Nickel-Strunz 1.CB.05a.
- Harmonized System - 2504.* (natural); 3801.10 / 3801.20 / 3801.90 (artificial, colloidal, other) - Customs split between mined graphite and manufactured carbon products.
- Which of these identifiers and schemes hold for the sense of graphite this model covers, and on what evidence? provenance
Standards and regulation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- ASTM D7219 (and the related ASTM C781 / C709 nuclear-graphite testing suite), ASTM International
- IEC 60239, graphite electrodes for electric arc furnaces, International Electrotechnical Commission
- REACH (EC) No 1907/2006 registration of graphite as CAS 7782-42-5, European Chemicals Agency
- OSHA 29 CFR 1910.1000: natural graphite respirable dust 2.5 mg/m³ (Table Z-3); synthetic graphite listed separately among particulates, Occupational Safety and Health Administration
- ACGIH TLV for graphite (all forms except fibres), 2 mg/m³ respirable, American Conference of Governmental Industrial Hygienists
- IAEA guidance and TECDOC series on nuclear graphite behaviour, irradiation damage and radioactive graphite waste, International Atomic Energy Agency
- Which of these standards and regulation hold for the sense of graphite this model covers, and on what evidence? provenance
Real-world use
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Lithium-ion battery anodes as natural spherical graphite or synthetic graphite, often carbon-coated
- Electric-arc-furnace and ladle electrodes, and aluminium-cell cathode blocks
- Refractory bricks, crucibles, foundry facings and steel-plant recarburisers
- Dry-film lubricant, forging-die lubricant and pencil cores (clay-graphite)
- Motor and generator carbon brushes and electrical contacts
- Expanded-graphite gaskets, packing rings and intumescent firestops
- Moderator and reflector blocks in graphite-moderated nuclear reactors
- Which of these real-world use hold for the sense of graphite this model covers, and on what evidence? provenance
Typical measurements
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Interlayer spacing d002 (XRD) - 0.3354 (ideal 2H) to about 0.344 (poorly graphitized / turbostratic) - nm
- True (helium) density - 2.09-2.26 - g/cm³
- Fixed carbon - about 70 (low-grade amorphous) to 99.95 (high-purity flake, synthetic, nuclear) - wt%
- Ash - <0.05 (nuclear / high-purity battery) to >15 (low-grade amorphous) - wt%
- In-plane thermal conductivity at room temperature - about 100-400 for polycrystalline stock; toward 1000-2000 for HOPG / basal plane - W/(m·K)
- Spherical graphite median particle size D50 (Li-ion anode grades) - 8-25 - µm
- Natural flake sieve size as traded - about 50-800 - µm
- Which of these typical measurements hold for the sense of graphite this model covers, and on what evidence? provenance
Failure modes and hazards
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Oxidation in air becomes significant above roughly 400-500 °C and consumes the solid in oxidising process atmospheres
- Fine powder is a combustible dust; chronic inhalation is associated with graphite pneumoconiosis and is occupationally limited
- In high vacuum or dry inert gas, adsorbed moisture/oxygen is lost and dry-lubricant performance collapses (unlike MoS2)
- Nuclear graphite stores Wigner energy, undergoes irradiation-induced dimensional change and cracking, and can be radiolytically oxidised in CO2-cooled cores
- Li-ion anode particles crack, grow SEI and plate lithium at high rate or low temperature
- EAF electrodes oxidise, spall and break in service; graphite in contact with metals can drive galvanic corrosion in electrolytes
- Which of these failure modes and hazards hold for the sense of graphite this model covers, and on what evidence? provenance
Regional variation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Older British usage still appears as plumbago or black lead in museum, mining and pencil-trade texts
- Vein (lump) graphite is a Sri Lankan speciality; so-called amorphous graphite is a trade name for microcrystalline material historically associated with Mexico, South Korea and Austria
- Flake mining is concentrated in China, Mozambique, Madagascar, Brazil and Canada; conversion of flake to battery-grade spherical graphite has been overwhelmingly Chinese
- Nuclear grades are national-programme names (UK PGA, US H-451, Japan IG-110, German ATR-2E) rather than a single global specification
- Which of these regional variation hold for the sense of graphite this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Graphene - Graphene is one or few basal planes; bulk graphite is a stacked crystal. Separate by Raman 2D-band shape/layer count and by whether the material is a free monolayer or a three-dimensional crystal.
- Diamond - Diamond is sp³, electrically insulating and much harder; graphite is sp² and electrically conductive. Separate by XRD, Raman (1332 cm⁻¹ vs G/2D bands) and conductivity or hardness.
- Carbon black - Carbon black is a disordered turbostratic combustion product of nanometre primary particles, not a mined or fully graphitized crystal. Separate by XRD d002/crystallite size, TEM morphology and manufacturing route.
- Anthracite / meta-anthracite - High-rank coal can look black and graphitic but remains organically derived and only partly ordered. Separate by XRD graphitization metrics and by petrographic (maceral) texture.
- Molybdenum disulfide - A competing solid lubricant with a similar lamellar habit but Mo-S chemistry and a silvery streak. Separate by XRF/assay and Raman; graphite also needs adsorbed moisture to lubricate, MoS2 does not.
- Hexagonal boron nitride (white graphite) - Isostructural lamellar insulator, white rather than black. Separate by colour, electrical resistivity and B/N versus C chemistry.
- Compacted graphite iron - A cast-iron graphite-morphology grade (CGI), not the mineral or carbon product. Separate by metallography of the metal matrix versus identification of a carbon powder or crystal.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of graphite this model covers, and on what evidence? provenance
Sources
- Mineral Commodity Summaries, Graphite chapter - Industrial kinds (flake, amorphous, vein, synthetic), producing countries, and end uses (refractories, batteries, lubricants, foundry, recarburisers).
- Wikidata item Q5309, Graphite - Stable identifiers (Wikidata, CAS, EC) and the mineral/allotrope sense of the name.
- PubChem Compound Summary for CID 5462310, Graphite - CAS 7782-42-5, EC 231-955-3, and the elemental-carbon identity of the commercial substance.
- Handbook of Mineralogy: Graphite - Crystal system, polytypes, hardness, density, and distinction from other native-carbon minerals.
- ASTM D7219, Standard Specification for Isotropic and Near-isotropic Nuclear Graphites - Nuclear-grade graphite as a separately specified industrial kind and the property suite used to qualify it.
- IEC 60239, Graphite electrodes for electric arc furnaces - Dimensions and designation - EAF graphite electrodes as a standardised commercial product form.
- OSHA 29 CFR 1910.1000, Air contaminants (Tables Z-1 and Z-3), graphite entries - Occupational exposure limits that treat natural and synthetic graphite dust as distinct regulated forms.
What the second pass must settle
- Which existing Vercy world models or registry entries already own graphite, graphene, expanded graphite or graphite-containing composites, and where should this model link rather than duplicate them?
- Which authoritative identification methods and classification conventions should govern boundaries between graphite, poorly ordered carbon and few-layer products?
- Should intercalated, oxidised and expanded forms remain states of this graphite model or be related to separately registered materials?
- Which sampling and measurement methods provide comparable graphite results across loose powders, flakes and consolidated bodies?
- Which application-specific qualification requirements belong in reusable graphite extensions, particularly for battery, refractory and nuclear uses?