MilliporeSigma
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8.14051

Sigma-Aldrich

Hexamethyldisiloxane

for synthesis

Synonym(s):
2,2,4,4-Tetramethyl-3-oxa-2,4-disilapentane, HMDSO, Hexamethyldisiloxane
Linear Formula:
((CH3)3Si)2O
CAS Number:
Molecular Weight:
162.38
MDL number:
EC Index Number:
203-492-7

Quality Level

vapor pressure

20 hPa ( 20 °C)

assay

≥98.5% (GC)

form

liquid

autoignition temp.

340 °C

potency

>12160 mg/kg LD50, oral (Rat)
>2000 mg/kg LD50, skin (Rat)

expl. lim.

0.5-21.8 % (v/v)

bp

100 °C/1013 hPa

mp

-68 °C

transition temp

flash point 4 °C

solubility

insoluble 0.00037 g/L

density

0.76 g/cm3 at 25 °C

storage temp.

2-30°C

InChI

1S/C6H18OSi2/c1-8(2,3)7-9(4,5)6/h1-6H3

InChI key

UQEAIHBTYFGYIE-UHFFFAOYSA-N

Analysis Note

Assay (GC, area%): ≥ 98.5 % (a/a)
Density (d 20 °C/ 4 °C): 0.762 - 0.764
Identity (IR): passes test

Pictograms

FlameEnvironment

Signal Word

Danger

Hazard Statements

Hazard Classifications

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

Storage Class Code

3 - Flammable liquids

WGK

WGK 2

Flash Point(F)

21.2 °F - closed cup

Flash Point(C)

-6 °C - closed cup

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