{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.methylsilane","code":"thing-q978572","url":"https://ver.cy/models/thing/q978572/","name":"methylsilane","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":"Methylsilane is the organosilicon compound CH3SiH3, a volatile, flammable molecular substance in which one hydrogen atom of silane is replaced by a methyl group.","purpose":"Enable an agent to recognise methylsilane, assess a particular material lot and its physical state, and determine whether its documented quality and handling constraints permit an intended use.","scope":{"in":["Molecular identity and distinction from other methyl-substituted silanes","Lot-specific methylsilane content, impurities and grade","Physical phase and properties under stated temperature and pressure","Chemical stability, incompatibilities and exposure hazards","Evidence supporting use eligibility and jurisdiction-specific substance identification"],"out":["Design, certification and maintenance of cylinders and gas-delivery equipment","Complete manufacturing or purification processes","Deposition reactor recipes and operating procedures","Properties of films or other products made from methylsilane","Commercial mixture formulations beyond their relationship to the methylsilane constituent"],"boundaries":[]},"distinguishingFeatures":["The molecular structure contains one methyl group bonded to SiH3: CH3SiH3, molecular formula CH6Si; identity reference: [NIST Chemistry WebBook](https://webbook.nist.gov/cgi/cbook.cgi?ID=992949).","CAS 992-94-9 identifies this substance; a name containing 'methylsilane' is insufficient to identify a substituted derivative as the same substance.","Unlike silane, SiH4, methylsilane contains carbon and a Si-C bond.","Unlike dimethylsilane and tetramethylsilane, methylsilane has exactly one methyl substituent and three silicon-bound hydrogens.","Methylsilane contains neither chlorine nor oxygen; methylchlorosilanes and methylalkoxysilanes require separate identities."],"structure":{"bundles":[{"id":"molecular-identity","name":"Molecular identity","description":"Establishes exactly which silicon-containing substance the record represents.","layers":[{"id":"structure-and-names","name":"Structure and names","description":"Connects the registry name to molecular connectivity.","findings":[{"id":"single-methyl-silane","name":"Single methyl substitution","description":"Record one methyl group bonded to silicon bearing three hydrogens; NIST also records the synonym silaethane.","questions":[{"text":"Does the supplied structure represent CH3-SiH3 with exactly three Si-H bonds?","id":"single-methyl-silane-q01","kind":"definition"},{"text":"Does the submitted name refer to this molecule or to a further substituted silane?","id":"single-methyl-silane-q02","kind":"boundary"}]}]},{"id":"identifier-evidence","name":"Identifier evidence","description":"Resolves external identifiers and analytical identity evidence.","findings":[{"id":"identity-crosswalk","name":"Verified identity crosswalk","description":"Associate registry identifiers and reference spectra with the same molecular species, distinguishing substance records from supplier products.","questions":[{"text":"Which read sources connect CAS 992-94-9, the EC number and a verified PubChem compound record?","id":"identity-crosswalk-q01","kind":"provenance"},{"text":"What analytical evidence distinguishes the sample from silane and other methylsilanes?","id":"identity-crosswalk-q02","kind":"measurement"}]}]}]},{"id":"composition-and-grade","name":"Composition and grade","description":"Describes the methylsilane content and accompanying species in an actual lot.","layers":[{"id":"assay-and-formulation","name":"Assay and formulation","description":"Separates neat-substance purity from mixture concentration.","findings":[{"id":"methylsilane-fraction","name":"Methylsilane fraction","description":"Record concentration basis, analytical method and whether other components are intentional constituents.","questions":[{"text":"What methylsilane fraction was measured, on what basis and with what uncertainty?","id":"methylsilane-fraction-q01","kind":"measurement"},{"text":"Is this a neat methylsilane lot or a mixture whose formulation belongs to a separate record?","id":"methylsilane-fraction-q02","kind":"boundary"}]}]},{"id":"impurities-and-qualification","name":"Impurities and qualification","description":"Connects individual impurity limits to evidence supporting the claimed grade.","findings":[{"id":"species-specific-impurities","name":"Species-specific impurities","description":"Track relevant impurities individually; the supplier specification lists silane, dimethylsilane, methylchlorosilane, methane and residual gases.","questions":[{"text":"Which impurities were measured in this lot, with what detection limits and concentration bases?","id":"species-specific-impurities-q01","kind":"measurement"},{"text":"Which certificate and application specification support the claimed electronic or other grade?","id":"species-specific-impurities-q02","kind":"provenance"}]}]}]},{"id":"phase-and-physical-state","name":"Phase and physical state","description":"Relates methylsilane properties to the conditions of a sample.","layers":[{"id":"phase-envelope","name":"Phase envelope","description":"Captures temperature-dependent and pressure-dependent phase evidence.","findings":[{"id":"conditioned-phase-properties","name":"Conditioned phase properties","description":"Keep transition temperatures and vapour-pressure data with their conditions, methods and uncertainty.","questions":[{"text":"What sourced melting and boiling temperatures apply, and at what pressures?","id":"conditioned-phase-properties-q01","kind":"measurement"},{"text":"Which validated vapour-pressure data cover the sample's relevant temperature range?","id":"conditioned-phase-properties-q02","kind":"provenance"}]}]},{"id":"sample-state","name":"Sample state","description":"Interprets measurements from a particular quantity of methylsilane.","findings":[{"id":"observed-phase-and-inventory","name":"Observed phase and inventory","description":"Record sample temperature, absolute pressure and phase before interpreting density or remaining quantity.","questions":[{"text":"What temperature and absolute pressure were observed, and is the sample single-phase or two-phase?","id":"observed-phase-and-inventory-q01","kind":"measurement"},{"text":"What phase-appropriate evidence supports the reported mass or amount of methylsilane?","id":"observed-phase-and-inventory-q02","kind":"measurement"}]}]}]},{"id":"reactivity-and-hazards","name":"Reactivity and hazards","description":"Captures evidence governing exposure, ignition and chemical compatibility.","layers":[{"id":"hazard-evidence","name":"Hazard evidence","description":"Maintains classification and exposure information with their applicability.","findings":[{"id":"applicable-classification","name":"Applicable classification","description":"Retain the applicable SDS and distinguish established classifications from unresolved ignition and toxicological details.","questions":[{"text":"Which current SDS establishes the hazard classification for this composition, supplied form and jurisdiction?","id":"applicable-classification-q01","kind":"provenance"},{"text":"What evidence establishes methylsilane's spontaneous-ignition behaviour and applicable occupational exposure limits?","id":"applicable-classification-q02","kind":"provenance"}]}]},{"id":"stability-and-contact","name":"Stability and contact","description":"Records conditions and contacts that may change methylsilane or make its use unacceptable.","findings":[{"id":"compatibility-boundaries","name":"Compatibility boundaries","description":"Require evidence for contact with air, moisture, oxidants and wetted materials, including relevant decomposition conditions.","questions":[{"text":"Which incompatible substances and material contacts are documented specifically for methylsilane?","id":"compatibility-boundaries-q01","kind":"boundary"},{"text":"What recorded exposure or storage deviation requires reassessment before further use?","id":"compatibility-boundaries-q02","kind":"action"}]}]}]},{"id":"use-and-regulatory-eligibility","name":"Use and regulatory eligibility","description":"Connects substance evidence to an intended role and applicable restrictions.","layers":[{"id":"application-fit","name":"Application fit","description":"Evaluates the material against a defined reagent or precursor requirement.","findings":[{"id":"qualified-material-role","name":"Qualified material role","description":"Link a proposed synthesis or deposition role to qualification evidence without importing reactor recipes or promising product composition.","questions":[{"text":"What application evidence supports selecting methylsilane for the intended reagent or precursor role?","id":"qualified-material-role-q01","kind":"provenance"},{"text":"Which lot properties and impurity limits must pass before this material is eligible for that role?","id":"qualified-material-role-q02","kind":"action"}]}]},{"id":"jurisdiction-and-supply","name":"Jurisdiction and supply","description":"Separates substance-wide requirements from restrictions attached to a supplied product.","findings":[{"id":"applicable-use-restrictions","name":"Applicable use restrictions","description":"Record dated inventory, transport and supplier restrictions with their jurisdiction and scope.","questions":[{"text":"Which inventory status, transport designation and use restrictions are verified for the relevant jurisdiction and supplied form?","id":"applicable-use-restrictions-q01","kind":"provenance"},{"text":"Does an identified restriction apply to methylsilane generally or only to this supplier's product and declared use?","id":"applicable-use-restrictions-q02","kind":"boundary"}]}]}]},{"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 methylsilane this model covers, and on what evidence?","id":"evidence-confidence-notes-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 methylsilane 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 methylsilane 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 methylsilane 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 methylsilane 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 methylsilane 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 methylsilane this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Identify methylsilane from cylinder labels, identifiers and safety data sheets.","Report its hazards from official sources.","Flag a leaking or damaged cylinder for emergency response."],"mustNot":["Handle or connect cylinders without trained people and gas-safety controls.","Release it where it can ignite near people or equipment.","Store cylinders unsecured or near oxidizers or heat.","Dispose of residual gas outside approved systems."],"requiresHuman":["Responding to a leak.","Changing gas-handling systems in a facility."]},"ethics":{"considerations":["Flammable gases in fabs and laboratories can cause fires that harm workers."],"affectedParties":["Fab and laboratory staff","Emergency responders"]},"owners":{"steward":"The facility or gas supplier that holds the cylinder.","roles":[],"masterSystems":[]},"relations":[{"target":"Q11173","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.methylsilane","Wikidata: Q978572 (https://www.wikidata.org/wiki/Q978572)"]},"properties":{"applicability":"required","items":["Molecular connectivity: CH3-SiH3; molecular formula CH6Si","Substance identifiers: CAS 992-94-9; EC 213-598-5; PubChem CID pending verification","Methylsilane assay: mol%, mass% or volume%, with analytical method and uncertainty","Impurity profile: Species-specific ppm with concentration basis and detection limits","Material phase: Gas, liquid or two-phase, at recorded temperature in K and absolute pressure in kPa","Phase-transition properties: Melting and boiling temperatures in K with pressure; vapour pressure in kPa at specified temperature","Hazard classification: Hazard classes, categories and statements with jurisdiction, SDS revision and supplied form","Use eligibility: Supported, conditional, unsupported or unresolved for a specified application"]},"recognition":{"applicability":"required","items":["Identity rests on the cylinder label, valve type and documentation.","Gas cylinders carry hazard diamonds for flammable gas."]},"capabilities":{"applicability":"required","items":["Match a material record to methylsilane using identifiers and structural evidence.","Compare a lot's assay and impurity results with an intended-use specification.","Assess whether recorded temperature and pressure support the stated phase.","Identify missing compatibility, hazard or exposure evidence before authorising a material use.","Link methylsilane to a proposed precursor or reagent role while retaining application-specific qualification requirements."]},"hazards":{"applicability":"required","items":["Highly flammable gas that forms explosive mixtures with air.","Cylinder pressure hazards.","Fire in gas cabinets and supply lines."]},"interfaces":{"applicability":"required","items":["Globally Harmonized System of Classification and Labelling of Chemicals (GHS), United Nations."]},"context":{"applicability":"required","items":["Methylsilane is encountered in specialist organosilicon research and as a precursor in some thin-film deposition processes.","Its identity, purity and documented supply conditions matter when assessing suitability for a particular research or manufacturing process."]}},"sources":[{"title":"Wikidata item Q978572: methylsilane","url":"https://www.wikidata.org/wiki/Q978572","note":"identity and sense of the item"},{"title":"Wikipedia: Methylsilane","url":"https://en.wikipedia.org/wiki/Methylsilane","note":"general description of the item"}],"openQuestions":["What is the verified PubChem CID for methylsilane, distinguished from a PubChem Substance ID for a supplier record?","Which primary measurements establish melting point, normal boiling point and vapour pressure, with uncertainty and applicable ranges?","What methylsilane-specific evidence resolves spontaneous ignition, moisture reactivity and decomposition behaviour under relevant conditions?","Which occupational exposure limits and current regulatory or transport classifications apply in the intended jurisdiction?","Which application-specific impurity thresholds and qualification results support the proposed grade and precursor use?"],"resources":{"spec":"/models/things/publications/thing-q978572/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q978572/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T11:18:23Z","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 2026-10-07T10:10:33+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}