PRODUCTS

SILOXANE

Siloxane is a kind of organosilicon compounds which is composed of –Si–O–Si–O– backbones with side chains R attached to the silicon atoms (R2SiO), where R is
a hydrogen atom or an organic radical possibly bearing functional groups.
Polymers of siloxanes are referred as silicones, such as polydimethylsiloxane (PDMS), which is the dominant polymer in the silicone industry.
Different kinds of siloxanes and polysiloxanes have been synthesized, aiming at fire-retardant applications.

CAS Number: 63148-62-9
EC Number: 205-492-2
Molecular Formula: C8H24O2Si3

Other names: Polydimethylsiloxane (Mw > 6800 Da), Polydimethylsiloxanes, Siloxanes and Silicones, di-Me, Baysilon, Dimethicone, DiMethyl Polysiloxane, dimethyl polysiloxane, DIMETHYL POLYSILOXANE (ME TERM), Dimethyl Silicone, Dimethyl silicone, dimethyl silicone, dimethyl silicone oil, DIMETHYL SILICONES AND SILOXANES, Dimethyl siloxane, dimethyl siloxane, Dimethyl siloxanes and silicones, dimethyl(oxo)silane, dimethyl-bis(trimethylsilyloxy)silane, Dimethylepolysiloxane, Dimethylpolysiloxane, Dimethylsilicone, dimethylsiloxane, Dimethylsiloxane trimethylsiloxane terminated, Dimethylsiloxane, trymethylsilyloxy terminated, Monomers of Siloxanes and Silicones, di-Methyl, Polidimetylosiloksan, Poly dimethyl siloxanes, poly(dimethylsilooxane), POLY(DIMETHYLSILOXANE), Poly(dimethylsiloxane), poly(dimethylsiloxane), Polydimethyisiloxane, polydimethyl siloxane, Polydimethylsiloxan, polydimethylsiloxan, POLYDIMETHYLSILOXANE, Polydimethylsiloxane, Polydimethylsiloxane,linear, Polydimethylsiloxanes, Polydimetylsiloxan, Polysiloxanes, di-Me, Silicon oil, Silicone antifoam 1430, Silicone Oil, Siloxane, Siloxane, dimethyl, Siloxanes, siloxanes and other silicones (polydimethylsiloxane), SILOXANES AND SILICONES, DI-ME, Siloxanes and Silicones, di-Me, Siloxanes and Silicones, di-Me (CTS) (MAN), Siloxanes and Silicones, di-Me(Polydimethylsiloxanes(PDMS)), Siloxanes and silicones, dimethyl, α,ω-trimethylsilyl terminated polydimethylsiloxane, Dimethylpolysiloxane, MED-360, Dimethicone, Dimethylpolysiloxane, Dimethylpolysiloxane Hydrolyzate (Silicone Oil), KF96, Poly[oxy(dimethylsilylene)], α-[trimethylsilyl]-ω-[(trimethylsilyl)oxy], Polydimethyisiloxane, Polydimethylsiloxan, Polydimethylsiloxane, Polydimethylsiloxane "Silicone Silbione fluids, Polydimethysiloxane Polymer, Polydimetylsiloxan, Silicone oil, 12648-49-6, 12684-12-7, 1471301-69-5, 1669409-87-3, 1669410-33-6, 167748-54-1, 2028348-45-8, 2161362-23-6, 37221-45-7, 39476-41-0, 53125-20-5, 63148-62-9, OCTAMETHYLTRISILOXANE, 107-51-7, Trisiloxane, octamethylPoly(dimethylsiloxane), 1,1,1,3,3,5,5,5-Octamethyltrisiloxane, Dimeticone, dimethyl-bis(trimethylsilyloxy)silane, Dimethicone 350, 63148-62-9, Pentamethyl(trimethylsilyloxy)disiloxane, Dimethylbis(trimethylsiloxy)silane, 9G1ZW13R0G, CHEBI:9147, Trisiloxane, 1,1,1,3,3,5,5,5-octamethylDimethylbis(trimethylsilyloxy)silane, Dimethicones, Poly(dimethylsiloxane), hydroxy terminated, MFCD00084411, MFCD00134211, MFCD00148360, CCRIS 3198, Poly(dimethylsiloxane), trimethylsiloxy terminated, EINECS 203-497-4, dimeticonum, UNII-9G1ZW13R0G, Dimeticona, FRD 20, Ctamethyltrisiloxane, MFCD00008264, Pentamethyl(trimethylsiloxy)disiloxane, octamethyl-trisiloxane, PDMS, dimethicone macromolecule, VOLASIL DM-1, Silicon Oil for Oil Bath, TRISILOXANE [INCI], DM-FLUID 1.0CS, EC 203-497-4, Octamethyltrisiloxane, 98%, DSSTox_CID_20710, DSSTox_RID_79558, DSSTox_GSID_40710, OS 20 (SILOXANE), SCHEMBL23459, Siliconoil Pharma 100 cSt., Dimethyl polysiloxane, bis(trimethylsilyl)-terminated, Dow Corning High-Vacuum Grease, CHEMBL2142985, DTXSID9040710, CHEBI:31498, CXQXSVUQTKDNFP-UHFFFAOYSAKF 96A1, OCTAMETHYLTRISILOXANE [MI], dimethylbis(trimethylsiloxy)siliane, Polydimethylsiloxane, 1000 cSt., alpha-(Trimethylsilyl)-omega-methylpoly(oxy(dimethylsilylene)), [(CH3)3SiO]2Si(CH3)2, Tox21_301002, CO9816, MFCD00165850, Silane, dimethylbis(trimethylsiloxy)-, AKOS015840180, ZINC169747808, Antifoam compound for anhydrous systems, FS-4459, NCGC00164100-01, NCGC00164100-02, NCGC00254904-01, CAS-107-51-7, DB-040764, FT-0631598, FT-0696355, O0257, O9816, C07261, D91850, S12475, A801717, XIAMETER(R) PMX-200 SILICONE FLUID 1 CST, J-001906, Poly(dimethylsiloxane), viscosity 1.0 cSt (25 C), Q2013799, XIAMETER(R) PMX-200 Silicone Fluid 20 CS, 2,2,4,4,6,6-hexamethyl-3,5-dioxa-2,4,6-trisilaheptane, Polydimethylsiloxane, 20,000 cSt. trimethoxysilyl terminated, Polydimethylsiloxane, extreme low volatility, viscosity 1000 cSt., Intermediate viscosity polydimethylsiloxane antifoam emulsion, 20% active, viscosity 1500cst, Polydimethylsiloxane, trimethylsiloxy terminated, reduced volatility, viscosity 20 cSt., 28349-86-2, Intermediate viscosity polydimethylsiloxane antifoam emulsion, 10% active, viscosity 1000-2000cst, Intermediate viscosity polydimethylsiloxane antifoam emulsion, 10% active, viscosity 800-2000cst, Intermediate viscosity polydimethylsiloxane antifoam emulsion, 20% active, viscosity 1000-2000cst, Intermediate viscosity polydimethylsiloxane antifoam emulsion, 30% active, viscosity 1000-2000cst, Polydimethylsiloxane, trimethylsiloxy terminated, extreme low volatility, viscosity 12.500 cSt., 1112-39-6 [RN], 214-189-4 [EINECS], Dimethoxy(dimethyl)silan [German] [ACD/IUPAC Name], Dimethoxy(dimethyl)silane [ACD/IUPAC Name], Diméthoxy(diméthyl)silane [French] [ACD/IUPAC Name], Dimethoxydimethylsilane, Dimethyldimethoxysilane, DMDMS, MFCD00025691 [MDL number], Silane, dimethoxydimethyl- [ACD/Index Name], VV3641666, 1,1-dimethoxy-1-methyl-1-silaethane, 103735-12-2 [RN], 63148-62-9 [RN], Dimethyl dimethoxysilane, Dimethyldimethoxysilane|Dimethoxydimethylsilane, DIMETHYLPOLYSILOXANE [Wiki], Dow Corning Z-6194 [Trade name], FS-3860, Polydimethylsiloxane [Wiki], A3QDB1RS1C [DBID], 104906_ALDRICH [DBID], 40160_FLUKA [DBID], 556688_ALDRICH [DBID], AY 43-004 [DBID], CD5605 [DBID], KBM 22 [DBID], NSC 93882 [DBID], NSC93882 [DBID], TSL 8112 [DBID], TSL 8117 [DBID], UNII [DBID]

A siloxane is a functional group in organosilicon chemistry with the Si−O−Si linkage.
The parent siloxanes include the oligomeric and polymeric hydrides with the formulae H(OSiH2)nOH and (OSiH2)n.
Siloxanes also include branched compounds, the defining feature of which is that each pair of silicon centres is separated by one oxygen (O) atom.
The siloxane functional group forms the backbone of silicones, the premier example of which is polydimethylsiloxane (PDMS).

The functional group R3SiO− (where the three Rs may be different) is called siloxy.
Siloxanes are manmade and have many commercial and industrial applications because of Siloxanes’ hydrophobicity, low thermal conductivity, and high flexibility.
Siloxanes are silicone-based compounds that are generally used for their softening, smoothing, and moistening action.

They make products like deodorants slide on more easily, and leave hair and skin more soft and silky.
Siloxane is a kind of organosilicon compounds which is composed of –Si–O–Si–O– backbones with side chains R attached to the silicon atoms (R2SiO), where R is a hydrogen atom or an organic radical possibly bearing functional groups.
Siloxanes are in products that contain silicon such as silicone baking utensils and pans, baby nipples, and pacifiers, medical devices and implants, water-repellent
windshield coating, construction lubricants and sealants as well as deodorant creams and moisturizers.

Siloxanes are a group of substances characterized by a chain of alternating silicon (Si) and oxygen (O) atoms.
Within the group, individual siloxane substances differ in size, weight and shape.
They form the backbone of silicone polymers that are used in a variety of applications such as sealants, adhesives, coatings, plastics, cosmetics, medical devices,
hygiene products, food contact materials, and many other industrial applications.

Siloxanes are adaptable species that have found extensive applications as versatile materials for functionalising various surfaces and as building blocks for
polymers and hybrid organic-inorganic systems.
The primary goal of this review is to report on and briefly explain the most relevant recent developments related to siloxanes and their applications, particularly regarding surface modification and the synthesis of graft copolymers bearing siloxane or polysiloxane segments.

The key strategies for both functionalisation and synthesis of siloxane-bearing polymers are highlighted, and the various trends in the development of siloxanebased materials and the intended directions of their applications are explored.
Siloxane is compound with a Si-O-Si bond functional group in silicone chemistry.
The parent siloxanes include oligomeric and polymeric hydrides with the formulae H(OSiH2)nOH and (OSiH2)n.

Molecular Weight: 236.53
Melting Point: 17.7°C
Boiling Point: 175°C
Density: 0.95 g/cm3 at 25°C

Siloxanes also include branched compounds, in which each pair of silicon centers is separated by one oxygen atom.
The siloxane functional groups form the backbone of the siloxane, a prime example of which is polydimethylsiloxane.
And the functional group (RO)3Si is called siloxy.
Siloxanes are a class of organosilicon compounds with the empirical formula R2SiO, where R is an organic group.

Representative examples are [SiO(CH3)2]n (dimethylsiloxane) and [SiO(C6H5)2]n (diphenylsiloxane), where n is typically > 4.
These compounds can be viewed as a hybrid of both organic and inorganic chemical compounds.
The organic side chains confer hydrophobic properties while the -Si-O-Si-O- backbone is purely inorganic.
The word siloxane is derived from the words Silicon, Oxygen, and alkane.

Siloxanes can be found in products such as cosmetics, deodorant, water repelling windshield coatings, food additives such as those used in certain McDonalds
fast food products, and some soaps.
They occur in landfill gas and are being evaluated as alternatives to perchloroethylene for drycleaning.
Perchloroethylene is widely considered environmentally undesirable.

Polymerized siloxanes are commonly known as silicones, although this name is somewhat of a misnomer.
A true silicone group has a double bond between oxygen and silicon (hence the derivation of the word silicone from ketone), and polymerized siloxanes do not
contain such groups.

Siloxanes also include branched compounds, the defining feature of which is that each pair of silicon centres is separated by one
oxygen (O2-) atom.

The siloxane functional group forms the backbone of silicones, the premier example of which is polydimethylsiloxane (PDMS).
The functional group R3SiO− (where the three Rs may be different) is called siloxy.
Siloxanes are manmade and have many commercial and industrial applications because of the compounds’ hydrophobicity, low thermal conductivity, and high flexibility.

Structure of Siloxane
Siloxane generally adopt structures expected for linked tetrahedral ("sp3-like") centers.
The Si−O bond length is 1.64 Å (vs Si–C distance of 1.92 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(2) Å with a more acute C−O−C angle of 111°.
Siloxane 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.

Synthesis of siloxanes
The main route to siloxane functional group is by hydrolysis of silicon chlorides:
2 R3Si−Cl + H2O → R3Si−O−SiR3 + 2 HCl

The reaction proceeds via the initial formation of silanols (R3Si−OH):
R3Si−Cl + H2O → R3Si−OH + HCl

The siloxane bond can then form via a silanol + silanol pathway or a silanol + chlorosilane pathway:
2 R3Si−OH → R3Si−O−SiR3 + H2O
R3Si−OH + R3Si−Cl → R3Si−O−SiR3 + HCl

Hydrolysis of a silyldichloride can afford linear or cyclic products.
Linear products are terminated with silanol groups:
R2Si(OH)2 → H(R2SiO)nOH + (n − 1) H2O

Cyclic products have no silanol termini:
n R2Si(OH)2 → (R2SiO)n + n H2O

The linear products, polydimethylsiloxane (PDMS), are of great commercial value.
Their production requires the production of dimethylsilicon dichloride.
Starting from trisilanols, cages are possible, such as the species with the formula (RSi)nO3n/2 with cubic (n = 8) and hexagonal
prismatic (n = 12) structures.
The cubic cages are cubane-type clusters, with silicon centers at the corners of a cube oxygen centres spanning each of the twelve
edges.

Reactions of Siloxane
Oxidation of organosilicon compounds, including siloxanes, gives silicon dioxide.
This conversion is illustrated by the combustion of hexamethylcyclotrisiloxane:
((CH3)2SiO)3 + 12 O2 → 3 SiO2 + 6 CO2 + 9 H2O

Strong base degrades siloxane group, often affording siloxide salts:
((CH3)3Si)2O + 2 NaOH → 2 (CH3)3SiONa + H2O

This reaction proceeds by production of silanols.
Similar reactions are used industrially to convert cyclic siloxanes to linear polymers.

Uses of Siloxane
Siloxane, 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.
Polyvinyl siloxane (vinyl polysiloxane) is used to make dental impressions and industrial impressions.

The use of a poly-siloxane precursor 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.

Cyclomethicones of Siloxane
Siloxane are a group of methyl siloxanes, a class of liquid silicones (cyclic polydimethylsiloxane polymers) that possess the characteristics of low viscosity and high volatility as well as being skin emollients and in certain circumstances useful cleaning solvents.
Unlike dimethicones, which are linear siloxanes that do not evaporate, cyclomethicones are cyclic: both groups consist of a backbone of [(CH3)2SiO]n.
They are used in many cosmetic products including deodorants and antiperspirants which need to coat the skin but not remain tacky afterward.

Dow is a major producer of cyclomethicones.
Siloxane, like all siloxanes, degrade by hydrolysis, producing silanols.
These silanols are produced at such low levels that they do not interfere with hydrolytic enzymes.
Even though some cyclomethicones structurally resemble crown ethers, they bind metal ions only weakly.

Use and Manufacturing of Siloxane
Used as a base for extreme temperature silicone oils/fluids and as a foam suppressant in petroleum lubricating oils; Used mainly to
make polydimethylsiloxane (PDMS) polymers, oligomers, and mixtures; Also used to make basic chemicals, paints, coatings, adhesives,
soaps, cleaning compounds, toiletries, plastics, semiconductors, and other electronic components, and in building construction,
lubricants, diluents, solvents, and cosmetics

Household Products
Household & Commercial/Institutional Products
Information on 28 consumer products that contain Trisiloxane in the following categories is provided:
Auto Products
Personal Care

Siloxane is a kind of organosilicon compounds which is composed of –Si–O–Si–O– backbones with side chains R attached to the silicon
atoms (R2SiO), where R is a hydrogen atom or an organic radical possibly bearing functional groups.
Polymers of siloxanes are referred as silicones, such as polydimethylsiloxane (PDMS), which is the dominant polymer in the silicone
industry.

Siloxane are commonly known as silicones.
They belong to the organosilicon compounds and are exclusively obtained by synthesis.
Their chemical structure determines a range of physicochemical properties which were recognized as unique.
Due to the susceptibility to chemical modifications, ability to create short, long or complex polymer particles, siloxanes found an
application in many areas of human life.

Siloxane is silicone-based compounds that are generally used for their softening, smoothing, and moistening action.
They make products like deodorants slide on more easily, and leave hair and skin more soft and silky.
Siloxane is in products that contain silicon such as silicone baking utensils and pans, baby nipples, and pacifiers, medical devices and
implants, water-repellent windshield coating, construction lubricants and sealants as well as deodorant creams and moisturizers

Applications of Siloxane
Siloxane can be used to produce Phenyl silicone rubber
Siloxane can be used to compound medicine intermediate, silicone intermediate and macromolecular compound.
Siloxane is a polymer material containing many siloxane functional groups throughout its structure.
Therefore, we can call this material polysiloxane.
Siloxane is a synthetic polymer that does not appear in nature.

This material contains a backbone, consisting of Si-O bonds.
Moreover, there are side chains attached to this backbone.
We usually consider this as an inorganic polymer because it has no carbon in its backbone.
Siloxane is a functional group having the Si-O-Si linkage.
This functional group is present in organosilicon compounds.

The siloxane compounds can be either straight chain compounds or branched compounds.
These linkages form the backbone of the silicone polymer, i.e. polymethylsiloxane.
Siloxane is any chemical compund composed of units of the form R2SiO, where R is a hydrogen atom or a hydro carbon group.
They belong to the wider class of Organosilicon compounds.
Siloxanes can have branched or unbranched back bones consisting of alternating silicon and oxygen atoms -Si-O-Si-O-, with side
chains R attached to silicon atoms.

Polymerised Siloxanes with organic side chains are commonly known as silicones or as polysiloxanes.
APPLICATIONS OF SILOXANES:
cosmetics (deodrants, sunblocks, hairsprays and skincare)
personal care products (tooth pastes)
industrial cleaning agents

Siloxane is any of various compounds containing alternate silicon and oxygen atoms in either a linear or cyclic arrangement usually with
one or two organic groups attached to each silicon atom.
Siloxanes come from the silicones that are parts in materials such as: shampoo, soaps, surfactants, oils, pharmaceutical products, and
so on., which are present in the substrate during the anaerobic digestion process to which is subjected this material.
Siloxane is compound with a Si-O-Si bond functional group in silicone chemistry.
The parent siloxanes include oligomeric and polymeric hydrides with the formulae H(OSiH2)nOH and (OSiH2)n.

Applications of Siloxane
Industry use:
Siloxane is a class of liquid siloxane with low viscosity and high volatility.
Siloxane is a skin emollient and a useful cleaning solvent in some cases.
Siloxane has short backbones that form closed or nearly closed cycles with methyl groups, giving them many of the same properties as
dimethicones, but making them become more volatile.
So Siloxane is used in many cosmetics where the ultimate complete evaporation of the siloxane carrier fluid is desired.
In this way, Siloxane is useful for products such as deodorants and antiperspirants that need to be applied to the skin but will not be sticky afterwards.

Organic chemistry:
Molecular capsules provide micro spaces within the molecule, where unstable species are protected and can be stabilized.
Cyclic oligomers of trisilanol are considered as transient intermediates in the polycondensation of trialkoxysilanes, resulting in the
formation of siloxane networks or ladder polymers.
The preparation and separation of these stable forms of intermediates are not only particularly important for understanding the
condensation process, but also important for the modeling of the silica surface in homogeneous systems and further conversion to
silicon-based functional materials.

If the condensation reaction of the trialkoxysilane is performed in the nanopore cavity of the self-assembled coordination cage, which
shows significant binding ability to the neutral molecule, a cyclic trimer can be prepared as a stable form.
Siloxanes, which can be viewed as hybrids of glass and organic materials, have been used to fabricate polymer waveguides and devices
that exploit the large thermo-optical effect of this material.
Siloxanes have many unique properties including good thermal stability, chemical resistance, tunable refractive index, tunable

mechanical properties and excellent photo-stability.
Biogas can be produced from uncontrolled and controlled systems.
Uncontrolled systems include landfills and marshlands, while controlled systems include wastewater treatment plants (WWTP) and
anaerobic digestion plants.
These biogas sources have high siloxane contamination, resulting from waste from industries and households.

Warning! According to the classification provided by companies to ECHA in CLP notifications this substance causes serious eye irritation.
Siloxane indicated, in 2009, as being intended to be registered by at least one company in the EEA.
Siloxane for which classification and labeling data have been submitted to ECHA in a registration under REACH or notified by manufacturers or importers under CLP.
Such notifications are required for hazardous substances, as such or in mixtures, as well as for all substances subject to registration, regardless of their hazard.