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Merck

235695

Octamethylcyclotetrasiloxane

98%

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

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About This Item

Linear Formula:
[-Si(CH3)2O-]4
CAS Number:
556-67-2
Molecular Weight:
296.62
UNSPSC Code:
12352103
NACRES:
NA.23
PubChem Substance ID:
24853994
EC Number:
209-136-7
Beilstein/REAXYS Number:
1787074
MDL number:
MFCD00003269

Key Documents

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InChI key

HMMGMWAXVFQUOA-UHFFFAOYSA-N

InChI

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

SMILES string

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

vapor density

1 (vs air)

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.)

Quality Level

200

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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.

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Warning

Hazard Classifications

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

Storage Class

3 - Flammable liquids

wgk

WGK 3

flash_point_f

123.8 °F - closed cup

flash_point_c

51 °C - closed cup

ppe

Eyeshields, Gloves, type ABEK (EN14387) respirator filter

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

556-67-2

CAS No.

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Certificates of Analysis (COA)

Lot/Batch Number
SDBB5491
SDBB2634
SDBB1773
STBL1043
STBL0288

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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
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)
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)
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)
Ramesh Sarangapani et al.
Toxicological sciences : an official journal of the Society of Toxicology, 67(2), 159-172 (2002-05-16)
Inhalation of octamethylcyclotetrasiloxane (D4) induces CYP2B1/2 protein and causes liver enlargement. We have developed a pharmacodynamic (PD) extension to a physiologically based pharmacokinetic (PBPK) model to characterize these dose-response behaviors. The PD model simulates interactions of D4 with a putative
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