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Octamethylcyclotetrasiloxane

Octamethylcyclotetrasiloxane
Octamethylcyclotetrasiloxane structure
CAS No.
556-67-2
Chemical Name:
Octamethylcyclotetrasiloxane
Synonyms
D4;REQ;DPF2;kf994;O9810;CO9810;uc7207;vs7207;BCM-d4;sf1173
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
color 
colorless
Specific Gravity
0.956
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
Cyclotetrasiloxane, octamethyl-(556-67-2)
SAFETY
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
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)
Symbol(GHS):
Signal word: Warning
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H226 Flammable liquid and vapour Flammable liquids Category 3 Warning
H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501
H311 Toxic in contact with skin Acute toxicity,dermal Category 3 Danger P280, P302+P352, P312, P322, P361,P363, P405, P501
H361 Suspected of damaging fertility or the unborn child Reproductive toxicity Category 2 Warning P201, P202, P281, P308+P313, P405,P501
H413 May cause long lasting harmful effects to aquatic life Hazardous to the aquatic environment, long-term hazard Category 4
Precautionary statements:
P201 Obtain special instructions before use.
P202 Do not handle until all safety precautions have been read and understood.
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P233 Keep container tightly closed.
P240 Ground/bond container and receiving equipment.
P264 Wash hands thoroughly after handling.
P264 Wash skin thouroughly after handling.
P270 Do not eat, drink or smoke when using this product.
P273 Avoid release to the environment.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P281 Use personal protective equipment as required.
P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P308+P313 IF exposed or concerned: Get medical advice/attention.
P370+P378 In case of fire: Use … for extinction.
P405 Store locked up.
P403+P235 Store in a well-ventilated place. Keep cool.
P501 Dispose of contents/container to..…

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 2018-11-13 Buy
Sigma-Aldrich 1154707 Cyclomethicone 4 United States Pharmacopeia (USP) Reference Standard 556-67-2 200mg $401 2018-11-13 Buy
TCI Chemical O0142 Octamethylcyclotetrasiloxane >98.0%(GC) 556-67-2 25mL $28 2018-11-22 Buy
TCI Chemical O0142 Octamethylcyclotetrasiloxane >98.0%(GC) 556-67-2 100mL $66 2018-11-22 Buy
Alfa Aesar A15240 Octamethylcyclotetrasiloxane, 98% 556-67-2 100g $66.7 2018-11-13 Buy

Octamethylcyclotetrasiloxane Chemical Properties,Uses,Production

Chemical Properties

Colorless clear liquid

Uses

Preparation of methyl silicon oils.

Uses

Fungicide

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.

Definition

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

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( 198)Suppliers
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View Lastest Price from Octamethylcyclotetrasiloxane manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-08-12 Octamethylcyclotetrasiloxane
556-67-2
US $1.00 / KG 1G 99% 100KG career henan chemical co

Octamethylcyclotetrasiloxane Spectrum


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