ChemicalBook > CAS DataBase List > Octamethylcyclotetrasiloxane

Octamethylcyclotetrasiloxane

Product Name:
Octamethylcyclotetrasiloxane
CAS No.
556-67-2
Chemical Name:
Octamethylcyclotetrasiloxane
CBNumber:
CB4490223
Molecular Formula:
C8H24O4Si4
Formula Weight:
296.62
MOL File:
556-67-2.mol
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Octamethylcyclotetrasiloxane Property

Melting point:
17-18 °C(lit.)
Boiling point:
175-176 °C(lit.)
Density 
0.956 g/mL at 25 °C(lit.)
vapor density 
1 (vs air)
refractive index 
n20/D 1.396(lit.)
Flash point:
140 °F
storage temp. 
2-8°C
solubility 
<0.001g/l Hydrolysis
form 
liquid
Specific Gravity
0.956
color 
colorless
explosive limit
0.4-11.7%(V)
Water Solubility 
INSOLUBLE
Sensitive 
Moisture Sensitive
Merck 
14,6747
BRN 
1787074
InChIKey
HMMGMWAXVFQUOA-UHFFFAOYSA-N
CAS DataBase Reference
556-67-2(CAS DataBase Reference)
NIST Chemistry Reference
Cyclotetrasiloxane, octamethyl-(556-67-2)
EPA Substance Registry System
Octamethylcyclotetrasiloxane (556-67-2)
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Safety

Hazard Codes 
Xn
Risk Statements 
53-62-10
Safety Statements 
36/37-46-51-61
RIDADR 
UN 1993 3/PG 3
WGK Germany 
1
RTECS 
GZ4397000
TSCA 
Yes
HazardClass 
3
PackingGroup 
III
HS Code 
29319090
Hazardous Substances Data
556-67-2(Hazardous Substances Data)
Toxicity
LD50 oral in rat: 1540mg/kg
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N-Bromosuccinimide Price More Price(12)

Sigma-Aldrich Gold
Product number:
235695
Product name :
Octamethylcyclotetrasiloxane
Purity:
98%
Packaging:
25g
Price:
$44.5
Updated:
2019/12/02
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Buy
Sigma-Aldrich Gold
Product number:
1154707
Product name :
Cyclomethicone 4
Purity:
United States Pharmacopeia (USP) Reference Standard
Packaging:
200mg
Price:
$399.35
Updated:
2019/12/02
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Buy
TCI Chemical Gold
Product number:
O0142
Product name :
Octamethylcyclotetrasiloxane
Purity:
>98.0%(GC)
Packaging:
25mL
Price:
$28
Updated:
2020/06/24
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Buy
TCI Chemical Gold
Product number:
O0142
Product name :
Octamethylcyclotetrasiloxane
Purity:
>98.0%(GC)
Packaging:
100mL
Price:
$66
Updated:
2020/06/24
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Buy
Alfa Aesar Gold
Product number:
A15240
Product name :
Octamethylcyclotetrasiloxane, 98%
Packaging:
500g
Price:
$256
Updated:
2020/06/24
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Buy
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Octamethylcyclotetrasiloxane Chemical Properties,Usage,Production

Chemical Properties

Colorless clear liquid

Uses

Preparation of methyl silicon oils.

Uses

Polydimethylsiloxane by the Polymerization of Octamethylcyclotetrasiloxane: To a resin flask equipped with a thermometer, stirrer, and reflux eondenser is added 1000 gm of octamethylcyclotetrasiloxane. The siloxane is heated to 165°C, and then 0.14gm of a potassium hydroxide-isopropanol complex (neutral equivalent = 193.5) is added to give a Si : Κ ratio of 4470:1. In 25 min the stirrer begins to stall, and the polymer is now heated for 3(1/2) hr at 150°C to complete polymerization. The resulting polymer has an intrinsic viscosity of 1.5 dl/gm corresponding to a molecular weight of 804,600.

Uses

Fungicide

Definition

ChEBI: A cyclosiloxane that is the octamethyl derivative of cyclotetrasiloxane.

Safety Profile

A skin irritant. When heated todecomposition it emits acrid smoke and irritating vapors.

Purification Methods

The solid exists in two forms, m 16.30o and 17.65o. Dry it over CaH2 and distil it. Further fractionation can be effected by repeated partial freezing and discarding the liquid phase. [Osthoff & Grubb J Am Chem Soc 76 399 1954, Hoffman J Am Chem Soc 75 6313 1953, Beilstein 4 IV 4125.]

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Octamethylcyclotetrasiloxane Suppliers

Global(235)Suppliers
Zhejiang hengyecheng organic silicon co. LTD
Tel:
0575-88171508
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0575-88172068
Email:
sales@hengyecheng.com
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China
ProdList:
10
Advantage:
58
Chengdu HuaXia Chemical Reagent Co. Ltd
Tel:
400-1196-196;028-84555506- ;028-84555506-
Fax:
QQ:800101999
Email:
cdhxsj@163.com;cdhxsj@163.com;cdhxsj@163.com
Country:
China
ProdList:
10037
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60
Hangzhou Bayee Chemical Co., Ltd.
Tel:
0086-571-86990109; 0086-18605816692
Fax:
0086-571-85775919
Email:
rachelhoo@bayeechem.com
Country:
China
ProdList:
105
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J & K SCIENTIFIC LTD.
Tel:
010-82848833- ;010-82848833-
Fax:
86-10-82849933
Email:
jkinfo@jkchemical.com;market6@jkchemical.com
Country:
China
ProdList:
96815
Advantage:
76
Meryer (Shanghai) Chemical Technology Co., Ltd.
Tel:
21-61259100-
Fax:
86-21-61259102
Email:
sh@meryer.com
Country:
China
ProdList:
40268
Advantage:
62
Alfa Aesar
Tel:
400-610-6006; 021-67582000
Fax:
021-67582001/03/05
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saleschina@alfa-asia.com
Country:
China
ProdList:
30163
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TCI (Shanghai) Development Co., Ltd.
Tel:
021-67121386 / 800-988-0390
Fax:
021-67121385
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Sales-CN@TCIchemicals.com
Country:
China
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24555
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81
ShangHai DEMO Chemical Co.,Ltd
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400-021-7337 qq:2355568890
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0086-21-50182339
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sales@demochem.com; export1@demochem.com
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China
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2583
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BeiJing Hwrk Chemicals Limted
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010-57411839-
Fax:
021-55236763
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bjsales@hwrkchemical.com
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18708
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