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CYCLIC SILOXANES (CYCLOSILOXANES)

DESCRIPTION:

Cyclic siloxanes (cyclosiloxanes) are basic members of the broad family of silicone materials.
Cyclic siloxanes (cyclosiloxanes) share a common chemistry but each substance is different when it comes to its properties and use.
A common denominator for Cyclic siloxanes (cyclosiloxanes) is that they contain repeating units of silicone (Si) and oxygen (O) atoms in a closed loop, giving it a “cyclic” structure. 
This also gives Cyclic siloxanes (cyclosiloxanes) their unique properties as hybrid inorganic-organic substances. 
Cyclic siloxanes (cyclosiloxanes) are three main cyclosiloxanes in commercial production and several decades of research has proven that they are safe for human health and the environment.

Cyclic siloxanes (cyclosiloxanes) are a volatile polydimethylcyclosiloxane, mainly composed of decamethylcyclopentasiloxane. 
Cyclic siloxanes (cyclosiloxanes) are colorless and transparent liquid, with low flow point and fast reaction speed. 
Cyclic siloxanes (cyclosiloxanes) has good compatibility with most alcohols and other cosmetic solvents and is widely used in cosmetics and human body care products, such as skin care, sunscreen, makeup, hair conditioning products. 
Cyclic siloxanes (cyclosiloxanes) can be directly used as a carrier, the main raw materials, can also be used as additives. 
Cyclic siloxanes (cyclosiloxanes) can also be used in water - based systems by emulsification.

Cyclic siloxanes (cyclosiloxanes) are an odourless, colourless liquid mostly used as an intermediate or basic raw material in the production of silicone rubbers, gels and resins. 
When Cyclic siloxanes (cyclosiloxanes) is used as an intermediate during the manufacturing process, virtually all D4 is consumed with only a tiny amount remaining in final products.
Cyclic siloxanes (cyclosiloxanes) generally adopt structures expected for linked tetrahedral centers. 
The Si−O bond length is 1.64 Å and the Si-O-Si angle is rather open at 142.5°.
By contrast, the C−O distance in a typical dialkyl ether is much shorter at 1.414.

Cyclic siloxanes (cyclosiloxanes) can be appreciated that the siloxanes would have low barriers for rotation about the Si−O bonds as a consequence of low steric hindrance. 
This geometric consideration is the basis of the useful properties of some siloxane-containing materials, such as their low glass transition temperatures.
Polysiloxanes (silicones), upon combustion in an inert atmosphere, generally undergo pyrolysis to form silicon oxycarbide or silicon carbide (SiC). 
By exploiting this reaction, polysiloxanes have been used as preceramic polymers in various processes including additive manufacturing. 
Cyclic siloxanes (cyclosiloxanes) are used to make dental impressions and industrial impressions. 
The use of a Cyclic siloxanes (cyclosiloxanes) in polymer derived ceramics allows the formation of ceramic bodies with complex shapes, although the significant shrinkage in pyrolysis needs to be taken into account.

Cyclic siloxanes (cyclosiloxanes) are the usual products of hydrolysis of difunctional silanes. 
The relative proportions of the oligomers formed depend upon the substituents and conditions employed. 
Cyclic siloxanes (cyclosiloxanes) polymerise on heating, particularly in the presence of a catalyst, but this process can be reversed at higher temperature if no cross-linking has occurred.
Cyclic siloxanes (cyclosiloxanes) form a group of chemicals with molecular weights from a few hundreds to several hundred thousands. 
Cyclic siloxanes (cyclosiloxanes) consist of silicon atoms linked via oxygen atoms, forming a cyclic or linear backbone structure. 

Each silicon atom bears one or several side chains, which may form cross-links and influence the properties of the polymer (e.g. phenyl side groups provide oxidative stability, aminopropyl side groups provide water solubility, and trifluoropropyl side groups provide high resistance to solvents). 
In the simplest form the side-chains consist of methyl groups (dimethylsiloxanes). 
Cyclic siloxanes (cyclosiloxanes) are of concern because of their high rate of use and their physical properties.
Cyclic siloxanes (cyclosiloxanes) are extremely volatile, have a relatively long half-life in air (6–11 d), and a high Kow.

Cyclic siloxanes (cyclosiloxanes) are high production volume chemicals that are widely used in household goods and personal care products. 
Due to their prevalence and chemical characteristics, Cyclic siloxanes (cyclosiloxanes) are being assessed as possible persistent organic pollutants. 
Cyclic siloxanes (cyclosiloxanes) are an odourless, colourless liquid mostly used as an intermediate or basic raw material in the production of silicone rubbers, gels and resins. 
Cyclic siloxanes (cyclosiloxanes) can also be used as a dry-cleaning solvent in closed systems, which significantly limits exposure to workers, consumers and the environment.

Cyclic siloxanes (cyclosiloxanes) are used in a wide range of industrial applications, such as resins, elastomers, fuel additives, automotive polishes, waxes, and antifoaming agents, as well as in personal care products and biomedical devices. 
Cyclic siloxanes (cyclosiloxanes) are the building blocks for many of these silicones polymers.
Cyclic siloxanes (cyclosiloxanes)'s main use is as a monomer in the manufacturing of polymeric silicones or as dry-cleaning solvent in closed system. 
Cyclic siloxanes (cyclosiloxanes) also has a minor but essential use in cosmetic applications. 

Cyclic siloxanes (cyclosiloxanes) is also used as a monomer in the manufacturing of polymeric silicones but is mainly present as solvent in cosmetic applications. 
Usually, Cyclic siloxanes (cyclosiloxanes) are chosen for their low toxicity, lack of skin smoothness and ease of formulation. 
Cyclic siloxanes (cyclosiloxanes) bring benefits to personal care products like silkiness in conditioners, volume in lip gloss and ease of application to deodorants. 
Cyclic siloxanes (cyclosiloxanes) are prepared by reacting a chloro endblocked polydimethylsiloxane with a diol functional compound containing at least 2 carbon atoms.
Cyclic siloxanes (cyclosiloxanes) are used with nucleophiles (such as organo lithium derivatives) to obtain oligomeric and polymeric silxoane chains. 

Cyclic siloxanes (cyclosiloxanes) are used in a variety of applications, such as surface modification, water protection, as high performance lubricants, adhesives, linker molecules and precursors for further chemical compounds.
Cyclic siloxanes (cyclosiloxanes) are a colorless viscous liquid. 
Cyclic siloxanes (cyclosiloxanes) are a common cyclomethicone. 
Cyclic siloxanes (cyclosiloxanes) are a volatile methylsiloxane (VMS) with a relatively low molecular weight. 
Cyclic siloxanes (cyclosiloxanes) have a silicon-oxygen bond in a cyclic arrangement and methyl groups are attached to the silicon atom. 

Cyclic siloxanes (cyclosiloxanes) can be used in the manufacture of silicone based polymers for use in medical devices and personal care products.
Cyclic siloxanes (cyclosiloxanes) can be polymerized through ring opening mechanism with a rare earth solid super acid as a catalyst for potential usage in the synthesis of vinyl coated polydimethylsiloxane (PDMS). 
Cyclic siloxanes (cyclosiloxanes) may also be used as a probe liquid for nuclear magnetic resonance cryoporometry (NMRC) to analyze the pore size distribution (PSD) of oil-bearing tight sandstone. 
Chemical vapor deposition (CVD) of D4 may be utilized for the preparation of siloxane based thin films.
Cyclic siloxanes (cyclosiloxanes) are used in processing aids, textile applications, cosmetics, toiletries, medical/pharmaceutical preparations, paper coatings, defoamers, paints, coatings, waxes, mechanical fluids, sealants and rubber.

Cyclic siloxanes (cyclosiloxanes) are an industrial product used in many applications, primarly in cosmetic products and polymers, in its pure form and in mixtures with other siloxanes.  
Cyclic siloxanes (cyclosiloxanes) are a byproduct of polymerisation.
Cyclic siloxanes (cyclosiloxanes) are a common chemical name for octamethylcyclotetra- siloxane. 
The primary use for Cyclic siloxanes (cyclosiloxanes) are to make other silicone chemicals and as an ingredient in some personal care products.
In the draft scope of the Cyclic siloxanes (cyclosiloxanes) risk evaluation, EPA preliminarily identified conditions of use associated with the manufacture and importing; processing; distribution in commerce; industrial, commercial and consumer uses; and disposal of D4.

Cyclic siloxanes (cyclosiloxanes) are a member of the cyclic siloxane, or cyclomethicone, family. 
Cyclic siloxanes (cyclosiloxanes) are often called simply D4 because of its four dimethylsiloxane units. 
Cyclic siloxanes (cyclosiloxanes) exists as an oily liquid or low-melting solid.
Cyclic siloxanes (cyclosiloxanes) are used in the following products: cosmetics and personal care products, washing & cleaning products, laboratory chemicals, polishes and waxes and coating products. 

Cyclic siloxanes (cyclosiloxanes) are used in the following areas: scientific research and development, formulation of mixtures and/or re-packaging and building & construction work. 
Cyclic siloxanes (cyclosiloxanes) are used for the manufacture of: Other release to the environment of this substance is likely to occur from: indoor use (e.g. machine wash liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners) and outdoor use.
Cyclic siloxanes (cyclosiloxanes) are singly bonded and form a ring. Some widely used cyclic siloxanes are displayed.
Cyclic siloxanes (cyclosiloxanes) are used in the manufacture of silicones, in combination or alone in personal care products, and as carriers, lubricants and solvents in a variety of commercial applications. 
Cyclic siloxanes (cyclosiloxanes) occur in environmental media, especially in sewage sludge.

 

USES:

Cyclic siloxanes (cyclosiloxanes) are used in processing aids, textile applications, cosmetics, toiletries, medical/pharmaceutical preparations, paper coatings, defoamers, paints, coatings, waxes, mechanical fluids, sealants and rubber.
Cyclic siloxanes (cyclosiloxanes) is used in dry cleaning and in industrial cleaning as an alternative to tetrachloroethylene.
Cyclic siloxanes (cyclosiloxanes) are used as precursors in the production of polymers (polydimethylsiloxane). 
The polymers contain some residual monomers and are used in industrial and consumer applications, in topical pharmaceutical formulations and in breast implants. 


-Cyclic siloxanes (cyclosiloxanes) are used in the following products: laboratory chemicals, non-metal-surface treatment products, polymers, semiconductors, leather treatment products, lubricants and greases and textile treatment products and dyes.
-Cyclic siloxanes (cyclosiloxanes) have an industrial use resulting in manufacture of another substance (use of intermediates).
-Cyclic siloxanes (cyclosiloxanes) are used in the following areas: scientific research and development.
-Cyclic siloxanes (cyclosiloxanes) are used for the manufacture of: chemicals.

 

FEATURES:

-Density (25℃, g/cm³ ) : 0.95-0.97
-Boiling point (℃): ≥135
-Flash point (℃): 56-58
-Refractive index: 1.396-1.397
-Refractive index: 1.3960-1.3970

 

APPLICATION:

-Adhesives and sealant chemicals
-Intermediates
-Lubricants and lubricant additives
-Paint additives and coating additives not described by other categories
-Process regulators
-Solvents (which become part of product formulation or mixture)
-Adhesives and sealants
-Automotive care products
-Cleaning and furnishing care products
-Paints and coatings
-Personal care products
-Plastic and rubber products not covered elsewhere
-Auto Products
-Commercial / Institutional
-Hobby/Craft
-Home Maintenance
-Inside the Home
-Personal Care
-Antiperspirant / Deodorant
-Cleansers
-Creams
-Color Cosmetics
-Lotions
-Serums
-Sun Care

 

BENEFITS:

-Lubrication
-Spreadability
-Suitable for Clear Formulations
-Tack Reduction
-Active Carrier
-Improves Wet Combing

 

PROPERTIES:

-Melting Point, °C: 17.7    
-Boiling Point, °C: 175    
-Density, g/cm3 at 25°C: 0.95    
-Vapour Pressure, Pa at 25°C: 132    
-Water Solubility, mg/L at 23°C: 0.056    
-Henry’s Law Constant, Pa m3/mol at 25°C: 1,214,000    
-Heat of Evaporation, kJ/mol: 44

 

SYNONYM:

DSSTox_CID_7205
DSSTox_RID_78349
DSSTox_GSID_27205
Union carbide 7207
Silicone SF 1173
MFCD00003269
C8H24O4Si4
HSDB 6131
Octamethylcyklotetrasiloxan 
KF 994
NSC 345674
SF 1173
UC 7207
VS 7207
BRN 1787074
volasil(tm) 244
bmse000765
EC 209-136-7
SCHEMBL18354
BIDD:ER0157
Dimethylsiloxane Cyclic Tetramer
CHEMBL1869229
DTXSID7027205
HMMGMWAXVFQUOA-UHFFFAOYSA-
Octamethylcyclotetrasiloxane, 98%
Tox21_201398
Tox21_300547
7595AH
CO9810
NSC345674
AKOS008901191
ZINC169743112
MCULE-2162943570
NSC-345674
NCGC00164099-01
NCGC00164099-02
NCGC00164099-03
NCGC00254406-01
NCGC00258949-01
CS-0213747
FT-0688100
O0142
O9810
Octamethylcyclotetrasiloxane, analytical standard
Cyclotetrasiloxane, 2,2,4,4,6,6,8,8-octamethyl-
octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
Q2013804
Octamethylcyclotetrasiloxane 
1787074
2,2,4,4,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetroxatetrasilocan 
2,2,4,4,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetroxatetrasilocane 
2,2,4,4,6,6,8,8-Octaméthyl-1,3,5,7,2,4,6,8-tétroxatétrasilocane
209-136-7 
556-67-2
CYCLOMETHICONE 4
Cyclotetrasiloxane, 2,2,4,4,6,6,8,8-octamethyl- 
CZ227117JE
D4 Cyclomethicone
GZ4397000
MFCD00003269 
[556-67-2] 
104986-37-0 
2,2,4,4,6,6,8,8-octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
2,2,4,4,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane; D4
3-Methylbut-2-en-1-ol
4-04-00-04125 
4-04-00-04125 
83874-62-8
C024064
CO9810
cyclic dimethylsiloxane tetramer
cyclotetrasiloxane, octamethyl-
D4
NCGC00164099-01
NUC silicone VS 7207
O9810
Octamethyl cyclotetrasiloxane
octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
Octamethylcyclotetrasiloxane D4
Octamethylcyclotetrasiloxane(D4)
octamethyltetrasiloxane


 

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