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235695

Sigma-Aldrich

Octamethylcyclotetrasiloxane

98%

Linear Formula:
[-Si(CH3)2O-]4
CAS Number:
Molecular Weight:
296.62
Beilstein:
1787074
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.23

vapor density

1 (vs air)

Quality Level

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.

Packaging

25, 100 g in glass bottle

Pictograms

FlameHealth hazard

Signal Word

Warning

Hazard Statements

Hazard Classifications

Aquatic Chronic 4 - Flam. Liq. 3 - Repr. 2

Storage Class Code

3 - Flammable liquids

WGK Germany

WGK 3

Flash Point(F)

123.8 °F - closed cup

Flash Point(C)

51 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

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)
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)
Synthesis of vinyl end-capped polydimethylsiloxane by ring opening polymerization of octamethylcyclotetrasiloxane (D4) catalyzed by rare earth solid super acid SO42-/TiO2/Ln3+.
Yang X, et al.
Polymer International, 63(2), 347-351 (2014)
Grazyna Zareba et al.
Skin pharmacology and applied skin physiology, 15(3), 184-194 (2002-06-22)
Octamethylcyclotetrasiloxane (D(4)) has been used for more than 40 years in industrial applications and consumer products, including the personal care industry. D(4) possesses many properties suitable for personal care products, such as low surface tension, water repellency, and thermal and...
Micaela B Reddy et al.
Toxicological sciences : an official journal of the Society of Toxicology, 72(1), 3-18 (2003-02-27)
In a recent pharmacokinetic study, six human volunteers were exposed by inhalation to 10 ppm (14)C-D(4) for 1 h during alternating periods of rest and exercise. Octamethylcyclotetrasiloxane (D(4)) concentrations were determined in exhaled breath and blood. Total metabolite concentrations were...

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