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Octamethylcyclotetrasiloxane

Octamethylcyclotetrasiloxane
Octamethylcyclotetrasiloxane structure
CAS No.
556-67-2
Chemical Name:
Octamethylcyclotetrasiloxane
Synonyms
D4;REQ;DPF2;OMCTS;kf994;O9810;BCM-d4;uc7207;vs7207;CO9810
CBNumber:
CB4490223
Molecular Formula:
C8H24O4Si4
Formula Weight:
296.62
MOL File:
556-67-2.mol

Octamethylcyclotetrasiloxane Properties

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)
SAFETY
  • Risk and Safety Statements
Symbol(GHS) 
GHS02,GHS06,GHS08
Signal word  Warning
Hazard statements  H302-H311-H226-H361-H413
Precautionary statements  P303+P361+P353-P501a-P281-P210-P280-P370+P378-P201-P202-P233-P240-P241+P242+P243-P264-P270-P273-P301+P312+P330-P302+P352+P312+P361+P364-P308+P313-P403+P235-P405-P501
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
Toxicity LD50 oral in rat: 1540mg/kg

Octamethylcyclotetrasiloxane price More Price(12)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 235695 Octamethylcyclotetrasiloxane 98% 556-67-2 25g $44.5 2019-12-02 Buy
Sigma-Aldrich 1154707 Cyclomethicone 4 United States Pharmacopeia (USP) Reference Standard 556-67-2 200mg $399.35 2019-12-02 Buy
TCI Chemical O0142 Octamethylcyclotetrasiloxane >98.0%(GC) 556-67-2 25mL $28 2020-06-24 Buy
TCI Chemical O0142 Octamethylcyclotetrasiloxane >98.0%(GC) 556-67-2 100mL $66 2020-06-24 Buy
Alfa Aesar A15240 Octamethylcyclotetrasiloxane, 98% 556-67-2 500g $256 2020-06-24 Buy

Octamethylcyclotetrasiloxane Chemical Properties,Uses,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.]

Octamethylcyclotetrasiloxane Preparation Products And Raw materials

Raw materials

Preparation Products


Octamethylcyclotetrasiloxane Suppliers

Global( 224)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
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Related articles


View Lastest Price from Octamethylcyclotetrasiloxane manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2020-02-10 Octamethylcyclotetrasiloxane ;Cyclotetrasiloxane
556-67-2
US $0.00 / KG 1KG min99% 20MT/month Hubei Co-Formula Material Tech Co., Ltd.
2020-01-13 Octamethylcyclotetrasiloxane
CAS NO 556-67-2
US $1.00 / KG 1KG 99% 20T Shaanxi Dideu Medichem Co. Ltd
2018-08-12 Octamethylcyclotetrasiloxane
556-67-2
US $1.00 / KG 1G 99% 100KG career henan chemical co

Octamethylcyclotetrasiloxane Spectrum


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