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Octamethylcyclotetrasiloxane

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Octamethylcyclotetrasiloxane Basic information
Octamethylcyclotetrasiloxane Chemical Properties
  • Melting point:17-18 °C (lit.)
  • Boiling point:175-176 °C (lit.)
  • Density 0.956 g/mL at 25 °C (lit.)
  • vapor density 1 (vs air)
  • refractive index n20/D 1.396(lit.)
  • Flash point:140 °F
  • storage temp. Store below +30°C.
  • solubility <0.001g/l Hydrolysis
  • form liquid
  • Specific Gravity0.956
  • color colorless
  • explosive limit0.4-11.7%(V)
  • Water Solubility INSOLUBLE
  • Sensitive Moisture Sensitive
  • Merck 14,6747
  • BRN 1787074
  • InChIKeyHMMGMWAXVFQUOA-UHFFFAOYSA-N
  • CAS DataBase Reference556-67-2(CAS DataBase Reference)
  • NIST Chemistry ReferenceCyclotetrasiloxane, octamethyl-(556-67-2)
  • EPA Substance Registry SystemOctamethylcyclotetrasiloxane (556-67-2)
Safety Information
MSDS
Octamethylcyclotetrasiloxane Usage And Synthesis
  • Chemical PropertiesColorless clear liquid
  • UsesPreparation of methyl silicon oils.
  • UsesPolydimethylsiloxane by the Polymerization of Octamethylcyclotetrasiloxane: To a resin flask equipped with a thermometer, stirrer, and reflux eondenser is added 1000 gm of octamethylcyclotetrasiloxane. The siloxane is heated to 165°C, and then 0.14gm of a potassium hydroxide-isopropanol complex (neutral equivalent = 193.5) is added to give a Si : Κ ratio of 4470:1. In 25 min the stirrer begins to stall, and the polymer is now heated for 3(1/2) hr at 150°C to complete polymerization. The resulting polymer has an intrinsic viscosity of 1.5 dl/gm corresponding to a molecular weight of 804,600.
  • UsesFungicide
  • DefinitionChEBI: A cyclosiloxane that is the octamethyl derivative of cyclotetrasiloxane.
  • Safety ProfileA skin irritant. When heated todecomposition it emits acrid smoke and irritating vapors.
  • Purification MethodsThe solid exists in two forms, m 16.30o and 17.65o. Dry it over CaH2 and distil it. Further fractionation can be effected by repeated partial freezing and discarding the liquid phase. [Osthoff & Grubb J Am Chem Soc 76 399 1954, Hoffman J Am Chem Soc 75 6313 1953, Beilstein 4 IV 4125.]
Octamethylcyclotetrasiloxane Preparation Products And Raw materials
Octamethylcyclotetrasiloxane(556-67-2)Related Product Information
OctamethylcyclotetrasiloxaneSupplierMore
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  • Company Name:Meryer (Shanghai) Chemical Technology Co., Ltd.
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