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235695

Sigma-Aldrich

Octamethylcyclotetrasiloxane

98%

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Synonym(s):
2,2,4,4,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane, octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
Linear Formula:
[-Si(CH3)2O-]4
CAS Number:
556-67-2
Molecular Weight:
296.62
Beilstein:
1787074
EC Number:
209-136-7
MDL number:
MFCD00003269
UNSPSC Code:
12352103
PubChem Substance ID:
24853994
NACRES:
NA.23

vapor density

1 (vs air)

Quality Level

200

Assay

98%

form

liquid

refractive index

n20/D 1.396 (lit.)

bp

175-176 °C (lit.)

mp

17-18 °C (lit.)

density

0.956 g/mL at 25 °C (lit.)

SMILES string

C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1

InChI

1S/C8H24O4Si4/c1-13(2)9-14(3,4)11-16(7,8)12-15(5,6)10-13/h1-8H3

InChI key

HMMGMWAXVFQUOA-UHFFFAOYSA-N

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General description

Octamethylcyclotetrasiloxane (D4) is a volatile methylsiloxane (VMS) with a relatively low molecular weight. This silicone fluid has a silicon-oxygen bond in a cyclic arrangement and methyl groups are attached to the silicon atom. D4 can be used in the manufacture of silicone based polymers for use in medical devices and personal care products.

Application

D4 can be polymerized through ring opening mechanism with a rare earth solid super acid as a catalyst for potential usage in the synthesis of vinyl coated polydimethylsiloxane (PDMS). It may also be used as a probe liquid for nuclear magnetic resonance cryoporometry (NMRC) to analyze the pore size distribution (PSD) of oil-bearing tight sandstone. Chemical vapor deposition (CVD) of D4 may be utilized for the preparation of siloxane based thin films.

Signal Word

Warning

Hazard Statements

H226,H361f,H410

Hazard Classifications

Aquatic Acute 1 - Aquatic Chronic 1 - Flam. Liq. 3 - Repr. 2

WGK

WGK 3

Flash Point(F)

closed cup

Flash Point(C)

closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Regulatory Information

危险化学品

Certificates of Analysis (COA)

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Photocatalytic oxidation of octamethylcyclotetrasiloxane (D4): Towards a better understanding of the impact of volatile methyl siloxanes on photocatalytic systems.
Lamaa L, et al.
Applied Catalysis. B, Environmental, 156, 438-446 (2014)
Applying octamethylcyclotetrasiloxane as a probe liquid for characterizing the pore size distribution of oil-bearing tight sandstones by nuclear magnetic resonance cryoporometry.
Liu Biao, et al.
Marine and Petroleum Geology, 88(2), 814-825 (2017)
Stephanie Watermann et al.
Metabolites, 11(1) (2021-01-13)
1H NMR spectroscopy, in combination with chemometric methods, was used to analyze the methanol/acetonitrile (1:1) extract of walnut (Juglans Regia L.) regarding the geographical origin of 128 authentic samples from different countries (France, Germany, China) and harvest years (2016-2019). Due
Hot-filament chemical vapor deposition of organosilicon thin films from hexamethylcyclotrisiloxane and octamethylcyclotetrasiloxane.
Lewis HGP
Journal of the Electrochemical Society, 148(12), F212-F220 (2001)
Waheed H Siddiqui et al.
Reproductive toxicology (Elmsford, N.Y.), 23(2), 202-215 (2007-01-16)
This study evaluated the potential toxicity of whole-body vapor inhalation of octamethylcyclotetrasiloxane (D(4)) on reproductive capabilities in exposed F(0) and F(1) parental animals and the potential effects on neonatal survival, growth, and development of the F(1) and F(2) offspring. F(0)
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