Octamethylcyclotetrasiloxane

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Octamethylcyclotetrasiloxane

Product Name: Octamethylcyclotetrasiloxane
CAS No.: 556-67-2
Chemical Name: Octamethylcyclotetrasiloxane
Synonyms: D4;OMCTS;Cyclotetrasiloxane,octamethyl-;Cyclic tetramer;unioncarbide7207;OCTAMETHYLTETRASILOXANE;Oktamethylcyklotetrasiloxan;Octamethylcyclotetrasiloxane,98%;2-Benzimidazolecarbamic Acid Methyl Ester-d4;2,2,4,4,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
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)
vapor pressure: 1.32hPa at 25℃
refractive index: n20/D 1.396(lit.)
Flash point:: 140 °F
storage temp.: Store below +30°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
Dielectric constant: 2.4（20℃）
InChIKey: HMMGMWAXVFQUOA-UHFFFAOYSA-N
LogP: 6.98 at 21.7℃
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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Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H226Flammable liquid and vapour

H410Very toxic to aquatic life with long lasting effects

Precautionary statements

P202Do not handle until all safety precautions have been read and understood.

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P233Keep container tightly closed.

P240Ground/bond container and receiving equipment.

P273Avoid release to the environment.

P308+P313IF exposed or concerned: Get medical advice/attention.

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N-Bromosuccinimide Price

Sigma-Aldrich

Product number: 235695
Product name: Octamethylcyclotetrasiloxane
Purity: 98%
Packaging: 25g
Price: $60.7
Updated: 2024/03/01

Sigma-Aldrich

Product number: 1154707
Product name: Cyclomethicone 4
Purity: United States Pharmacopeia (USP) Reference Standard
Packaging: 200mg
Price: $491
Updated: 2024/03/01

Sigma-Aldrich

Product number: 8.14750
Product name: Octamethylcyclotetrasiloxane
Purity: for synthesis
Packaging: 25ML
Price: $44.7
Updated: 2023/06/20

Sigma-Aldrich

Product number: 8.14750
Product name: Octamethylcyclotetrasiloxane
Purity: for synthesis
Packaging: 100ML
Price: $130
Updated: 2023/06/20

Sigma-Aldrich

Product number: 8.14750
Product name: Octamethylcyclotetrasiloxane
Purity: for synthesis
Packaging: 250ML
Price: $209
Updated: 2023/06/20

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Octamethylcyclotetrasiloxane Chemical Properties,Usage,Production

Chemical Properties

Octamethylcyclotetrasiloxane is also known as D4. It is an odorless, colorless non-oily silicone fluid which has C8H24O4Si4 as chemical formula. It is a cyclic organic silicon substance which can be used as monomer in the production of silicone polymers such as rubber, resins and greases.

Uses

Octamethylcyclotetrasiloxane is used as a monomer in the production of silicone polymers and as an intermediate in the production of other organosilicon substances.Further it finds its application in electronics, textiles, personal care products and household care products.
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: Octamethylcyclotetrasiloxane is a cyclosiloxane that is the octamethyl derivative of cyclotetrasiloxane. It is an organosilicon compound and a cyclosiloxane. It derives from a hydride of a cyclotetrasiloxane.

Preparation

Commercially Octamethylcyclotetrasiloxane is produced from dimethyldichlorosilane. Dimethyldichlorosilane is added dropwise to water, the temperature is maintained at 30-40°C, stratified, the acid water is released, the oily material is hydrolyzed with sodium hydroxide solution, the hydrolysate and 0.5%-2% potassium hydroxide are added to the cracking kettle and cracked at 120-140°C and 99.8 kPa vacuum. The cracked material is fractionated and the fraction is collected at 173-176°C to obtain octamethylcyclotetraoxysilane.

General Description

Octamethylcyclotetrasiloxane (D4) is a volatile methylsiloxane (VMS) with a relatively low molecular weight. This silicone fluid has a silicon-oxygen bond in a cyclic arrangement and methyl groups are attached to the silicon atom. D4 can be used in the manufacture of silicone based polymers for use in medical devices and personal care products.

Health Hazard

Octamethylcyclotetrasiloxane (D4) can interfere with the body’s hormones. In animals, it can affect the reproductive system.
D4 is classified as a category 1 endocrine disruptor by the European Commission. A 2018 study commissioned by the Danish EPA identified D4 as an endocrine disruptor. The Global Harmonized System Label Requirements classified D4 as suspected to produce reproductive toxicity. D4 was added to the Toxic Substances Control Act work plan due to reproductive toxicity, moderate environmental persistence, and high bioaccumulation potential.
Adverse reproductive effects including estrogenic effects have been observed in rodents. The European Chemicals Agency characterized D4 as a persistent, bioaccumulative, and toxic chemical, and designated D4 as a Substance of Very High Concern.

Flammability and Explosibility

Flammable

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

Hydrolyzate Dichlorodimethylsilane

Preparation Products

Dimethicone Organosilicon water-proofing agent Hydroxy silicone oil emulsion Dimethoxymethylphenylsilane Silicone rubber,high temperature-vulcanized mixing Poly(dimethylsiloxane) Polydimethylsiloxane, dihydroxy terminated Silicone rubber,methyl RTV 107 silicone softener RS Amino-modified silicone oil Silicone oil polyether modified Silicone oil

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View Lastest Price from Octamethylcyclotetrasiloxane manufacturers

HEBEI SHENGSUAN CHEMICAL INDUSTRY CO.,LTD

Product: Octamethylcyclotetrasiloxane 556-67-2
Price: US $100.00-75.00/kg
Min. Order: 1kg
Purity: 99%
Supply Ability: 5000
Release date: 2024-08-21

Hebei Zhuanglai Chemical Trading Co.,Ltd

Product: Octamethylcyclotetrasiloxane 556-67-2
Price: US $60.00/kg
Min. Order: 1kg
Purity: 99
Supply Ability: 5000
Release date: 2024-05-10

Hebei Yanxi Chemical Co., Ltd.

Product: octamethylcyclotetrasiloxane 556-67-2
Price: US $40.00/KG
Min. Order: 1KG
Purity: 0.99
Supply Ability: 10 tons
Release date: 2023-09-26

556-67-2, OctamethylcyclotetrasiloxaneRelated Search:

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