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Decamethyltetrasiloxane

Properties, data and information sources.

 

Contents

Decamethyltetrasiloxane is an organic chemical compound from the siloxane group.

 

Names and Identifiers

Name
Decamethyltetrasiloxane
Formula
C10H30O3Si4
Molar mass
310.687 (g/mol)
CAS registry number
141-62-8
EC number EINECS
205-491-7
InChI Key
YFCGDEUVHLPRCZ-UHFFFAOYSA-N

Systematic name
[Dimethyl(trimethylsilyloxy)silyl]oxy-dimethyl-trimethylsilyloxysilane

Other names, synonyms
1,1,1,3,3,5,5,7,7,7-Decamethyltetrasiloxane; 1,1,3,3-Tetramethyl-1,3-bis(trimethylsiloxy)disiloxane

 

Chemical formulas

Molecular formula and structural formula of Decamethyltetrasiloxane:

 

C10H30O3Si4

Mr = 310.687 g/mol

[Dimethyl(trimethylsilyloxy)silyl]oxy-dimethyl-trimethylsilyloxysilane
SMILES: C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C

 

Data and Properties

Pure decamethyltetrasiloxane is a clear, colorless liquid.

solubility:
+ Soluble in benzene.
- Unsoluble in water (0,006 mg/L at 25 °C).
melting point
-68 °C
boiling point
194 °C
flash point
62 °C
density
0.854 g cm-3 at 20 °C
vapor pressure
52 Pa at 20 °C
refractive index
nD = 1.389 at 20 °C

 

Spectroscopic data:

SpectraBase (NMR, IR, FTIR, Raman, UV-Vis, MS ... spectra)
3d2ADvu4dVf
NIST IR-Spektrum
Decamethyltetrasiloxane

Calculated NMR spectrum (Predict Spectra via NMRDB)
1H NMR Spektrum, 13C NMR Spektrum.

 

Percentage and isotopic composition:

Mass-related elemental composition and isotope proportions of the compound Decamethyltetrasiloxane - C10H30O3Si4 - calculated based on molecular mass.

Symbol
Element ENumber x
of atoms ExData of the element
and isotopes *Percentages
of isotopesPercentage of
Ex in formula massC
Carbon10 Ar = 12.011 u
ΣAr = 120.11 u
12C: 12 u [98,94 %]
14C: 14.00324 u [<< 1 %]
13C: 13.00335 u [1,06 %] 
12C: 38.2497 %
14C: trace
13C: 0.40979 %
38.6595 %H
Hydrogen30 Ar = 1.008 u
ΣAr = 30.24 u
3H: 3.01605 u [<< 1 %]
1H: 1.00783 u [99,99 %]
2H: 2.0141 u [0,01 %] 
3H: trace
1H: 9.7323 %
2H: 0.00097 %
9.7333 %O
Oxygen3 Ar = 15.999 u
ΣAr = 47.997 u
16O: 15.99491 u [99,757 %]
17O: 16.99913 u [0,03835 %]
18O: 17.99916 u [0,205 %] 
16O: 15.41113 %
17O: 0.00592 %
18O: 0.03167 %
15.4487 %Si
Silicon4 Ar = 28.085 u
ΣAr = 112.34 u
28Si: 27.97693 u [92,254 %]
29Si: 28.97649 u [4,673 %]
30Si: 29.97377 u [3,073 %] 
28Si: 33.35773 %
29Si: 1.68969 %
30Si: 1.11115 %
36.1586 %

*) The third column lists the atomic masses or isotope masses of the elements involved and - in square brackets - the natural isotope composition.

 

More calculated data

The molar mass is M = 310.687 grams per mole.

The amount of substance in one kilogram of the substance is n = 3.219 mol.

The amount of substance in one gram of the substance is n = 0.003 mol.

Monoisotopic mass: 310.1272009606 Da - related to 12C101H3016O328Si4.

 

Hazard warnings according to GHS

(General information without guarantee of accuracy and completeness! The information does not replace the chemical safety data sheet or a risk assessment, but rather provides a general overview of the risk posed by the hazardous substance.

Signal word: Warning

GHS hazard statements (H phrases):


H226
Flammable liquid and vapour

H413
May cause long lasting harmful effects to aquatic life

Decamethyltetrasiloxane is on the EU Candidate List of Substances of Very High Concern (SVHC): very persistent and very bioaccumulative (vPvB).

Labeling in the EU: See ECHA Substance Infocard 100.004.993.

For toxicology and occupational safety when handling Decamethyltetrasiloxane as well as measures to be taken in case of danger, see: Hazardous Substances Information System GESTIS, ZVG-Nr. 102625.

 

External Sources

PubChem:ID 8852ChemSpider:ID 8520UNII of the FDA (USA):Unique Ingredient Identifier C23WAL597TEPA CompTox Chemicals Dashboard:DTXSID2044551

 

Manufacturers and Sources of Supply

The table below lists producers and suppliers of Decamethyltetrasiloxane as a commercial chemical for laboratories, research, industry and production with the corresponding contact details.

 

Literature Sources

[0] - Specialist and research articles in scientific journals via PubMed: Decamethyltetrasiloxane.

 

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Last update: 2026-02-16

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