{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.calcium-silicide","code":"thing-q416381","url":"https://ver.cy/models/thing/q416381/","name":"calcium silicide","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.MAT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"Calcium silicide is a calcium-silicon material, commonly referring to calcium disilicide (CaSi2), whose precise phase composition and impurity content must be specified to distinguish a defined compound from a commercial metallurgical product.","purpose":"Enable an agent to identify calcium silicide, assess a specific material lot, and determine whether its composition, condition and documented handling requirements support an intended use.","scope":{"in":["Resolution of the registered name to a documented calcium silicide composition","Calcium-to-silicon ratio, phase identity, purity and technical-grade constituents","Particle form, surface condition and changes during storage","Measured physical properties with phase and test conditions","Material-specific reactivity, hazard identity and use suitability"],"out":["Elemental calcium and silicon as independently supplied substances","Calcium silicates and other oxygen-containing calcium-silicon compounds","Manufacturing equipment and synthesis process designs","Finished steel, alloy or formulated products containing calcium silicide","Detailed operating procedures for metallurgical or chemical conversion processes"],"boundaries":[]},"distinguishingFeatures":["Resolve the formula explicitly: PubChem distinguishes CaSi, CaSi2 and Ca2Si records, so the bare name does not establish stoichiometry. [CaSi](https://pubchem.ncbi.nlm.nih.gov/compound/Calcium-silicide-_CaSi), [CaSi2](https://pubchem.ncbi.nlm.nih.gov/compound/Calcium-silicide-_CaSi2), [Ca2Si](https://pubchem.ncbi.nlm.nih.gov/compound/Dicalcium-silicide).","Require evidence of a calcium silicide phase rather than accepting a physical mixture of calcium and silicon on elemental composition alone.","Distinguish silicide from silicate using phase identification and oxygen-bearing constituent analysis; superficial oxidation does not by itself establish bulk silicate identity.","Distinguish a nominal compound from a technical material: a supplier sells technical calcium silicide under CaSi2 and CAS 12013-56-8, but that designation alone does not establish a lot's phase purity. [Supplier product record](https://www.sigmaaldrich.com/JP/en/product/aldrich/21240).","Treat powder, granules and consolidated material as forms requiring separate condition and suitability evidence, even when their nominal formula matches."],"structure":{"bundles":[{"id":"chemical-identity","name":"Chemical identity","description":"Resolve what calcium silicide denotes for this registry entry and each material record.","layers":[{"id":"name-and-stoichiometry","name":"Name and stoichiometry","description":"Connect the generic name to an explicitly supported formula.","findings":[{"id":"formula-resolution","name":"Formula resolution","description":"Keep the registered name intact while recording whether evidence identifies a particular calcium silicide or leaves the composition unresolved.","questions":[{"text":"What formula does the registry's originating record actually denote?","id":"formula-resolution-q01","kind":"definition"},{"text":"Does the material documentation identify a compound, a multiphase technical material or only a trade name?","id":"formula-resolution-q02","kind":"boundary"}]}]},{"id":"identifier-alignment","name":"Identifier alignment","description":"Check that external identifiers describe the same resolved material.","findings":[{"id":"composition-linked-identifiers","name":"Composition-linked identifiers","description":"Attach CAS, EC and database references to their documented composition rather than to the unqualified name alone.","questions":[{"text":"Which read source supports each identifier and its associated formula?","id":"composition-linked-identifiers-q01","kind":"provenance"},{"text":"Do the label, SDS and analytical certificate refer to the same calcium silicide identity?","id":"composition-linked-identifiers-q02","kind":"boundary"}]}]}]},{"id":"composition-and-phase-purity","name":"Composition and phase purity","description":"Describe the calcium-silicon phases and other constituents actually present.","layers":[{"id":"elemental-balance","name":"Elemental balance","description":"Establish measured calcium, silicon and relevant impurity contents.","findings":[{"id":"assay-basis","name":"Assay basis","description":"Record whether a purity claim means elemental content, compound content or another supplier-defined basis.","questions":[{"text":"What are the measured calcium and silicon mass fractions and their analytical uncertainties?","id":"assay-basis-q01","kind":"measurement"},{"text":"What does the stated purity percentage measure, and which constituents are excluded from it?","id":"assay-basis-q02","kind":"definition"}]}]},{"id":"phase-assemblage","name":"Phase assemblage","description":"Distinguish the intended silicide from other crystalline phases and residual elements.","findings":[{"id":"phase-evidence","name":"Phase evidence","description":"Use phase-sensitive characterization to assess the nominal formula and detect additional silicides, free elements or oxygen-bearing phases.","questions":[{"text":"Which phases are supported by diffraction or another suitable identification method?","id":"phase-evidence-q01","kind":"measurement"},{"text":"Does the observed phase assemblage support the claimed grade, or require description as a mixture?","id":"phase-evidence-q02","kind":"boundary"}]}]}]},{"id":"physical-form-and-properties","name":"Physical form and properties","description":"Relate measurable behavior to calcium silicide phase, particle form and test conditions.","layers":[{"id":"particle-and-packing-state","name":"Particle and packing state","description":"Describe particle dimensions and packing-dependent properties.","findings":[{"id":"size-and-density-basis","name":"Size and density basis","description":"Keep particle-size distributions and bulk density separate from intrinsic material density.","questions":[{"text":"What are the material form and measured particle-size distribution, including the fine fraction?","id":"size-and-density-basis-q01","kind":"measurement"},{"text":"Is the reported density a phase density, skeletal density, loose bulk density or tapped bulk density?","id":"size-and-density-basis-q02","kind":"definition"}]}]},{"id":"conditional-thermal-properties","name":"Conditional thermal properties","description":"Identify which thermal observations belong to the resolved phase and environment.","findings":[{"id":"thermal-event-assignment","name":"Thermal event assignment","description":"Require evidence distinguishing melting, phase transformation, decomposition and environmental reaction before assigning a thermal constant.","questions":[{"text":"Which thermal events were measured, under what atmosphere and pressure, and for which phase composition?","id":"thermal-event-assignment-q01","kind":"measurement"},{"text":"Is a reported melting or boiling value experimentally supported for this material, or should it remain unassigned?","id":"thermal-event-assignment-q02","kind":"provenance"}]}]}]},{"id":"reactivity-and-material-condition","name":"Reactivity and material condition","description":"Connect the material's exposure history and reactive behavior to its present usability.","layers":[{"id":"exposure-and-alteration","name":"Exposure and alteration","description":"Track potentially consequential contact with moisture, air and other environments.","findings":[{"id":"condition-evidence","name":"Condition evidence","description":"Record exposure history and evidence of alteration without treating visual appearance as proof of chemical stability.","questions":[{"text":"What moisture, air or temperature exposure has occurred since the lot was characterized?","id":"condition-evidence-q01","kind":"provenance"},{"text":"What evidence indicates a change in surface composition, phase content or material performance?","id":"condition-evidence-q02","kind":"measurement"}]}]},{"id":"reactive-contact-constraints","name":"Reactive contact constraints","description":"Establish documented incompatibilities for the identified grade and form.","findings":[{"id":"water-reactivity-applicability","name":"Water-reactivity applicability","description":"The CaSi2 record reports flammable-gas hazards on water contact; the agent must establish applicable controls from documentation matching the actual product. [PubChem CaSi2 safety information](https://pubchem.ncbi.nlm.nih.gov/compound/Calcium-silicide-_CaSi2).","questions":[{"text":"What water-contact, air-exposure and chemical-incompatibility hazards are documented for this grade and particle form?","id":"water-reactivity-applicability-q01","kind":"provenance"},{"text":"Which contemplated contacts or operations require restriction under the matching SDS and approved procedure?","id":"water-reactivity-applicability-q02","kind":"action"}]}]}]},{"id":"use-qualification-and-controls","name":"Use qualification and controls","description":"Translate calcium silicide specifications and applicable hazard records into traceable material decisions.","layers":[{"id":"application-acceptance","name":"Application acceptance","description":"Compare the actual lot with requirements imposed by its intended material role.","findings":[{"id":"lot-to-use-match","name":"Lot-to-use match","description":"Assess calcium and silicon contributions, phase content, contaminants and feed form against explicit application criteria.","questions":[{"text":"What calcium content, silicide phase, impurity limits and particle-size requirements does the intended use impose?","id":"lot-to-use-match-q01","kind":"boundary"},{"text":"Does the lot meet those requirements, or what additional evidence is required before acceptance?","id":"lot-to-use-match-q02","kind":"action"}]}]},{"id":"classification-and-handling-evidence","name":"Classification and handling evidence","description":"Associate product-specific regulatory and handling records with their jurisdiction and revision.","findings":[{"id":"applicable-material-controls","name":"Applicable material controls","description":"Record supported hazard classifications, transport designations, exposure limits and storage requirements without transferring them between unresolved calcium silicide identities.","questions":[{"text":"Which current SDS and jurisdiction-specific records apply to this exact composition and supplied form?","id":"applicable-material-controls-q01","kind":"provenance"},{"text":"Are exposure limits specific to this substance, applicable to identified constituents or dust categories, or not established?","id":"applicable-material-controls-q02","kind":"boundary"},{"text":"What documented storage, handling and transport conditions must be satisfied for the proposed activity?","id":"applicable-material-controls-q03","kind":"action"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of calcium silicide this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-kinds","name":"Kinds and varieties","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these kinds and varieties hold for the sense of calcium silicide this model covers, and on what evidence?","id":"evidence-kinds-q01","kind":"provenance"}]},{"id":"evidence-identifiers","name":"Identifiers and schemes","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these identifiers and schemes hold for the sense of calcium silicide this model covers, and on what evidence?","id":"evidence-identifiers-q01","kind":"provenance"}]},{"id":"evidence-standards-and-regulation","name":"Standards and regulation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these standards and regulation hold for the sense of calcium silicide this model covers, and on what evidence?","id":"evidence-standards-and-regulation-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these real-world use hold for the sense of calcium silicide this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these typical measurements hold for the sense of calcium silicide this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of calcium silicide this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of calcium silicide this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe calcium silicide's uses, for example in steelmaking, and state which phase and grade a record refers to.","Report the water-reactivity hazard from the safety data sheet."],"mustNot":["Store or handle it where it can get wet or contact acids.","Ship it without the dangerous goods classification and packaging the rules require.","Provide guidance on using it in incendiary or improvised devices.","Mix records for the defined compound with those for commercial alloys of variable composition."],"requiresHuman":["Approving bulk storage, firefighting plans or disposal on a site."]},"ethics":{"considerations":["Workers and firefighters can be hurt when water-reactive materials are poorly labelled."],"affectedParties":["Steelworks and foundry workers","Firefighters","Transport workers"]},"owners":{"steward":"The business that holds it; the supplier answers for its classification and labelling.","roles":[],"masterSystems":["Chemical substance inventories such as the EU REACH registration database"]},"relations":[{"target":"Q11173","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.calcium-silicide","Wikidata: Q416381 (https://www.wikidata.org/wiki/Q416381)"]},"properties":{"applicability":"required","items":["Resolved chemical identity: Explicit formula and phase assignment; unresolved when evidence is insufficient","Regulatory and database identifiers: CAS number, EC number and PubChem CID linked to the matching composition and source","Bulk calcium and silicon content: Mass % for each element and calculated atomic Ca:Si ratio","Crystalline phase composition: Identified phases and mass % where quantitatively established","Grade and impurity profile: Supplier grade and specification, with impurities reported in mass % or mg/kg","Particle form and size distribution: Form category; particle sizes in µm or mm; distribution method and basis","Surface and storage condition: As received, documented exposure, altered surface, suspected degradation or unassessed","Thermal behavior: Transition or decomposition temperature in °C, with pressure, atmosphere and event assignment","Density: g/cm³ for material density; kg/m³ for bulk density; method and temperature","Applicable hazard classification: Product-specific GHS classes and statements, jurisdiction, SDS revision and evidence status"]},"recognition":{"applicability":"required","items":["A grey, metallic-looking powder, granules or lumps.","Packed in sealed, dry containers marked as dangerous when wet."]},"capabilities":{"applicability":"required","items":["Resolve a supplier's calcium silicide label against composition, phase evidence and identifiers.","Compare lots against an application's calcium content, phase purity, impurity and particle-size requirements.","Determine which reported physical properties apply to the identified phase and material form.","Flag a lot for reassessment after undocumented moisture, air or thermal exposure.","Retrieve applicable handling and transport requirements from a matching current SDS.","Record acceptance, rejection or a request for additional characterization with supporting evidence."]},"hazards":{"applicability":"required","items":["Releases flammable gas on contact with water or acids.","Dust can ignite and irritate the lungs.","Water must not be used on fires involving it."]},"interfaces":{"applicability":"required","items":["Globally Harmonized System of Classification and Labelling of Chemicals (GHS), United Nations.","Recommendations on the Transport of Dangerous Goods, Model Regulations, United Nations."]},"context":{"applicability":"required","items":["Calcium silicide is encountered in metallurgical supply chains and laboratories studying calcium-silicon compounds.","Commercial calcium-silicon materials are used in steel treatment for deoxidation and inclusion modification, while defined calcium disilicide is also studied as a precursor for silicon-based materials."]}},"sources":[{"title":"Wikidata item Q416381: calcium silicide","url":"https://www.wikidata.org/wiki/Q416381","note":"identity and sense of the item"},{"title":"Wikipedia: Calcium disilicide","url":"https://en.wikipedia.org/wiki/Calcium_disilicide","note":"general description of the item"}],"openQuestions":["Does the registry's originating record intend calcium disilicide specifically or a broader calcium silicide identity?","Which CAS, EC and PubChem identifiers belong to that intended identity, and how should technical mixtures be linked without changing registry granularity?","Which phases, impurities and assay conventions occur in the grades relevant to this registry entry?","Which thermal constants and exposure-dependent changes are supported by measurements for those phases and forms?","Which current hazard classifications, transport requirements and exposure limits apply across the relevant supplied grades and jurisdictions?"],"resources":{"spec":"/models/things/publications/thing-q416381/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q416381/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T08:21:26Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:30+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}