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Linear Formula:


MDL Number:


EC No.:



98% Octamethylcyclotetrasiloxane
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(2N) 99% Octamethylcyclotetrasiloxane
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(3N) 99.9% Octamethylcyclotetrasiloxane
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(4N) 99.99% Octamethylcyclotetrasiloxane
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(5N) 99.999% Octamethylcyclotetrasiloxane
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(6N) 99.9999% Octamethylcyclotetrasiloxane
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Octamethylcyclotetrasiloxane Properties (Theoretical)

Compound Formula C8H24O4Si4
Molecular Weight 296.61
Appearance Colorless liquid
Melting Point 17-18 °C
Boiling Point 175-176 °C
Density 0.956-0.959 g/mL
Solubility in H2O Insoluble
Refractive Index n20/D 1.395-1.398
Exact Mass 296.075165 g/mol
Monoisotopic Mass 296.075165 g/mol

Octamethylcyclotetrasiloxane Health & Safety Information

Signal Word Warning
Hazard Statements H226-H361-H413
Hazard Codes F, Xn
Precautionary Statements P281
Flash Point 51-54 °C
RTECS Number GZ4397000
Transport Information UN 1993 3/PG III
WGK Germany 3
GHS Pictograms

About Octamethylcyclotetrasiloxane

Octamethylcyclotetrasiloxane is one of numerous organosilicon compounds manufactured by American Elements under the trade name AE Organometallics™. Organometallics are useful reagents, catalysts, and precursor materials with applications in thin film deposition, industrial chemistry, pharmaceuticals, LED manufacturing, and others. American Elements supplies organometallic compounds in most volumes including bulk quantities and also can produce materials to customer specifications. Most materials can be produced in high and ultra high purity forms (99%, 99.9%, 99.99%, 99.999%, and higher) and to many standard grades when applicable including Mil Spec (military grade), ACS, Reagent and Technical Grades, Pharmaceutical Grades, Optical, Semiconductor, and Electronics Grades. Please request a quote above for more information on pricing and lead time.

Octamethylcyclotetrasiloxane Synonyms

Octamethyl cyclotetrasiloxane, Dimethylsiloxane Cyclic Tetramer, 2,2,4,4,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane, D4, Cyclomethicone 4, Oktamethylcyklotetrasiloxan, [-Si(CH3)2O-]4, CAS 104986-37-0, CAS 83874-62-8

Chemical Identifiers

Linear Formula [(CH3)2SiO]4
MDL Number MFCD00003269
EC No. 209-136-7
Beilstein/Reaxys No. 1787074
Pubchem CID 11169
IUPAC Name 2,2,4,4,6,6,8,8-octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
SMILES C[Si]1(O[Si](O[Si](O[Si](O1)(C)C)(C)C)(C)C)C
InchI Identifier InChI=1S/C8H24O4Si4/c1-13(2)9-14(3,4)11-16(7,8)12-15(5,6)10-13/h1-8H3

Packaging Specifications

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Shipping documentation includes a Certificate of Analysis and Safety Data Sheet (SDS). Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes, and 36,000 lb. tanker trucks.

Related Elements


See more Silicon products. Silicon (atomic symbol: Si, atomic number: 14) is a Block P, Group 14, Period 3 element with an atomic weight of 28.085. Silicon Bohr MoleculeThe number of electrons in each of Silicon's shells is 2, 8, 4 and its electron configuration is [Ne] 3s2 3p2. The silicon atom has a radius of 111 pm and a Van der Waals radius of 210 pm. Silicon was discovered and first isolated by Jöns Jacob Berzelius in 1823. Silicon makes up 25.7% of the earth's crust, by weight, and is the second most abundant element, exceeded only by oxygen. The metalloid is rarely found in pure crystal form and is usually produced from the iron-silicon alloy ferrosilicon. Elemental SiliconSilica (or silicon dioxide), as sand, is a principal ingredient of glass, one of the most inexpensive of materials with excellent mechanical, optical, thermal, and electrical properties. Ultra high purity silicon can be doped with boron, gallium, phosphorus, or arsenic to produce silicon for use in transistors, solar cells, rectifiers, and other solid-state devices which are used extensively in the electronics industry.The name Silicon originates from the Latin word silex which means flint or hard stone.


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