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DM 350 (Dimethicone 350) is a mid-weight, non-volatile silicone.
DM 350 (Dimethicone 350) is used in the beauty industry as a conditioner, skin and hair protector.
DM 350 (Dimethicone 350) is a midweight silicone oil that is also a conditioning agent.
CAS Number : 9006-65-9
EC Number : 618-433-4
Molecular Formula : C6H14OSi
Average mass : 130.260 Da
DM 350 (Dimethicone 350) is a mid-weight, non-volatile silicone.
DM 350 (Dimethicone 350) adds wonderful slip to our products and helps reduce tackiness.
Small concentrations add a really gorgeous, expensive-feeling skin feel.
DM 350 (Dimethicone 350) helps improve spreading, offers skin protection, and conditions the skin and hair.
DM 350 (Dimethicone 350) can also reduce soaping in lotion formulations.
DM 350 (Dimethicone 350) is also an FDA approved skin protectant.
DM 350 (Dimethicone 350) is a midweight silicone oil that is also a conditioning agent.
DM 350 (Dimethicone 350) provides silky, smooth feel to both skin and hair.
DM 350 (Dimethicone 350) is used in the beauty industry as a conditioner, skin and hair protector.
DM 350 (Dimethicone 350) can be used alone or as a carrier for other ingredients in cosmetics and personal care products.
Benefits of DM 350 (Dimethicone 350):
DM 350 (Dimethicone 350) reduce the surface tension of a formulating allowing it to spread easily across the skin or hair.
They can form a barrier on the skin to prevent moisture loss, act as lubricants or as skin-feel modifiers bringing a silky, invisible feel to emulsions.
Finally DM 350 (Dimethicone 350) can be used in colour cosmetics to enable 'oil free' claims.
PHYSICAL AND CHEMICAL PROPERTIES of DM 350 (Dimethicone 350)
Appearance, Physical State: Liquid
Odor: Characteristic
Taste: Not available
Color: Colorless
Molecular Weight: 162.38 g/mol
pH (1% sol. in water) Not determined
Boiling Point: >65°C (149°F)
Melting Point: Not determined
Viscosity: 350 cSt
Vapor Density: Not determined
Evaporation Rate: Not available
Flammability: May be combustible
Upper/lower Explosive Limit: Not determined
Flash Point: >120°C (248°F)
Specific Gravity @ 25°C: 0.97
Solubility: Not determined
DM 350 (Dimethicone 350) in its simplest form is polydimethylsiloxane, also known as silicone oil, but more commonly called dimethicone.
DM 350 (Dimethicone 350) are derived from silica (sand and quartz are silicas).
DM 350 (Dimethicone 350) comes in various viscosities, this one is 350 centistokes, a medium viscosity which offers excellent barrier properties when used in skin protectant formulations. DM 350 (Dimethicone 350) adds slip and glide, reducing tackiness.
DM 350 (Dimethicone 350) offers conditioning properties when used in hair and skin care applications.
DM 350 (Dimethicone 350) is a medium viscosity Dimethyl Polysiloxane used used in a variety of Personal Care and Industrial applications.
DM 350 (Dimethicone 350) adds silky softness to hair formulations, improves spreadability and provides lubricity in lotions, is non-sticky, long-lasting, and improves water repellency.
DM 350 (Dimethicone 350) is recommended for hair care, skin care, and cosmetic products.
DM 350 (Dimethicone 350) has a viscosity of 350 at 25ºC.
DM 350 (Dimethicone 350) is a silicone polymer with a wide variety of uses, from cosmetics to industrial lubrication.
DM 350 (Dimethicone 350) is particularly known for its unusual rheological (or flow) properties.
DM 350 (Dimethicone 350) is optically clear and, in general, inert, non-toxic, and non-flammable.
DM 350 (Dimethicone 350) is one of several types of silicone oil (polymerized siloxane).
Its applications range from contact lenses and medical devices to elastomers; it is also present in shampoos (as it makes hair shiny and slippery), food (antifoaming agent), caulk, lubricants and heat-resistant tiles.
Structure of DM 350 (Dimethicone 350)
The chemical formula of DM 350 (Dimethicone 350) is CH3[Si(CH3)2O]nSi(CH3)3, where n is the number of repeating monomer [Si(CH3)2O] units.
Industrial synthesis can begin from dimethyldichlorosilane and water by the following net reaction:
n Si(CH3)2Cl2 + (n + 1) H2O → HO[−Si(CH3)2O−]nH + 2n HCl
The polymerization reaction evolves hydrochloric acid.
For medical and domestic applications, a process was developed in which the chlorine atoms in the silane precursor were replaced with acetate groups.
In this case, the polymerization produces acetic acid, which is less chemically aggressive than HCl.
As a side-effect, the curing process is also much slower in this case.
The acetate is used in consumer applications, such as silicone caulk and adhesives.
Branching and capping of DM 350 (Dimethicone 350)
Hydrolysis of Si(CH3)2Cl2 generates a polymer that is terminated with silanol groups (–Si(CH3)2OH).
These reactive centers are typically "capped" by reaction with trimethylsilyl chloride:
2 Si(CH3)3Cl + [Si(CH3)2O]n−2[Si(CH3)2OH]2 → [Si(CH3)2O]n−2[Si(CH3)2OSi(CH3)3]2 + 2 HCl
Silane precursors with more acid-forming groups and fewer methyl groups, such as methyltrichlorosilane, can be used to introduce branches or cross-links in the polymer chain.
Under ideal conditions, each molecule of such a compound becomes a branch point.
This can be used to produce hard silicone resins.
In a similar manner, precursors with three methyl groups can be used to limit molecular weight, since each such molecule has only one reactive site and so forms the end of a siloxane chain.
Well-defined DM 350 (Dimethicone 350) with a low polydispersity index and high homogeneity is produced by controlled anionic ring-opening polymerization of hexamethylcyclotrisiloxane.
Using this methodology it is possible to synthesize linear block copolymers, heteroarm star-shaped block copolymers and many other macromolecular architectures.
The polymer is manufactured in multiple viscosities, from a thin pourable liquid (when n is very low), to a thick rubbery semi-solid (when n is very high).
DM 350 (Dimethicone 350) molecules have quite flexible polymer backbones (or chains) due to their siloxane linkages, which are analogous to the ether linkages used to impart rubberiness to polyurethanes.
Such flexible chains become loosely entangled when molecular weight is high, which results in DM 350 (Dimethicone 350)' unusually high level of viscoelasticity.
Mechanical properties of DM 350 (Dimethicone 350)
DM 350 (Dimethicone 350) is viscoelastic, meaning that at long flow times (or high temperatures), it acts like a viscous liquid, similar to honey.
However, at short flow times (or low temperatures), it acts like an elastic solid, similar to rubber.
Viscoelasticity is a form of nonlinear elasticity that is common amongst noncrystalline polymers.
The loading and unloading of a stress-strain curve for PDMS do not coincide; rather, the amount of stress will vary based on the degree of strain, and the general rule is that increasing strain will result in greater stiffness.
When the load itself is removed, the strain is slowly recovered (rather than instantaneously).
This time-dependent elastic deformation results from the long-chains of the polymer.
But the process that is described above is only relevant when cross-linking is present; when it is not, the polymer PDMS cannot shift back to the original state even when the load is removed, resulting in a permanent deformation.
However, permanent deformation is rarely seen in DM 350 (Dimethicone 350), since it is almost always cured with a cross-linking agent.
If some DM 350 (Dimethicone 350) is left on a surface overnight (long flow time), it will flow to cover the surface and mold to any surface imperfections.
However, if the DM 350 (Dimethicone 350) is poured into a spherical mold and allowed to cure (short flow time), it will bounce like a rubber ball.
The mechanical properties of DM 350 (Dimethicone 350) enable this polymer to conform to a diverse variety of surfaces.
Since these properties are affected by a variety of factors, this unique polymer is relatively easy to tune.
This enables DM 350 (Dimethicone 350) to become a good substrate that can easily be integrated into a variety of microfluidic and microelectromechanical systems.
Specifically, the determination of mechanical properties can be decided before DM 350 (Dimethicone 350) is cured; the uncured version allows the user to capitalize on myriad opportunities for achieving a desirable elastomer.
Generally, the cross-linked cured version of DM 350 (Dimethicone 350) resembles rubber in a solidified form.
DM 350 (Dimethicone 350) is widely known to be easily stretched, bent, compressed in all directions.
Depending on the application and field, the user is able to tune the properties based on what is demanded.
Applications of DM 350 (Dimethicone 350)
Surfactants and antifoaming agents
DM 350 (Dimethicone 350) derivatives are common surfactants and are a component of defoamers.
DM 350 (Dimethicone 350), in a modified form, is used as an herbicide penetrant and is a critical ingredient in water-repelling coatings, such as Rain-X.
Hydraulic fluids and related applications
DM 350 (Dimethicone 350) is used in the active silicone fluid in automotive viscous limited slip differentials and couplings.
Daytime radiative cooling
DM 350 (Dimethicone 350) is a common surface material used in passive daytime radiative cooling as a broadband emitter that is high in solar reflectivity and heat emissivity.
Many tested surfaces use PDMS because of its potential scalability as a low-cost polymer.
As a daytime radiative cooling surface, DM 350 (Dimethicone 350) has also been tested to improve solar cell efficiency.
Medicine and cosmetics
DM 350 (Dimethicone 350) is often used in over-the-counter drugs as an antifoaming agent and carminative.
DM 350 (Dimethicone 350) also works as a moisturizer that is lighter and more breathable than typical oils.
Silicone breast implants are made out of a PDMS elastomer shell, to which fumed amorphous silica is added, encasing PDMS gel or saline solution.
The use of DM 350 (Dimethicone 350) in the manufacture of contact lenses was patented (later abandoned).[32]
Skin
DM 350 (Dimethicone 350) is used variously in the cosmetic and consumer product industry as well.
For example, DM 350 (Dimethicone 350) is used widely in skin-moisturizing lotions where it is listed as an active ingredient whose purpose is "skin protection." Some cosmetic formulations use dimethicone and related siloxane polymers in concentrations of use up to 15%.
The Cosmetic Ingredient Review's (CIR) Expert Panel, has concluded that dimethicone and related polymers are "safe as used in cosmetic formulations."
Hair
DM 350 (Dimethicone 350) compounds such as amodimethicone, are effective conditioners when formulated to consist of small particles and be soluble in water or alcohol/act as surfactants(especially for damaged hair), and are even more conditioning to the hair than common dimethicone and/or dimethicone copolyols.
Contact lenses
A proposed use of DM 350 (Dimethicone 350) is contact lens cleaning.
Its physical properties of low elastic modulus and hydrophobicity have been used to clean micro and nano pollutants from contact lens surfaces more effectively than multipurpose solution and finger rubbing; the researchers involved call the technique PoPPR (polymer on polymer pollution removal) and note that it is highly effective at removing nanoplastic that has adhered to lenses.
As anti-parasitic
DM 350 (Dimethicone 350) is effective for treating lice in humans.
This is thought to be due not to suffocation (or poisoning), but to its blocking water excretion, which causes insects to die from physiological stress either through prolonged immobilisation or disruption of internal organs such as the gut.[39]
DM 350 (Dimethicone 350) is the active ingredient in an anti-flea preparation sprayed on a cat, found to be equally effective to a widely used more toxic pyriproxifen/permethrin spray.
The parasite becomes trapped and immobilised in the substance, inhibiting adult flea emergence for over three weeks.
Foods
DM 350 (Dimethicone 350) is added to many cooking oils (as an anti-foaming agent) to prevent oil splatter during the cooking process.
As a result of this, DM 350 (Dimethicone 350) can be found in trace quantities in many fast food items such as McDonald's Chicken McNuggets, French fries, hash browns, milkshakes and smoothies and Wendy's French fries.
Under European food additive regulations, DM 350 (Dimethicone 350) is listed as E900.
Substance identity
EC / List no.: 618-433-4
CAS no.: 9006-65-9
Hazard classification & labelling of DM 350 (Dimethicone 350)
Warning! According to the classification provided by companies to ECHA in CLP notifications this substance causes serious eye irritation.
DM 350 (Dimethicone 350) indicated, in 2009, as being intended to be registered by at least one company in the EEA.
DM 350 (Dimethicone 350) 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.
Synonyms:
Belsil DM 1000
1664
Dimethicone
Dimethicone 350
Dimethicones
Dimethyl polysiloxane, bis(trimethylsilyl)-terminated
Dimethyl polysiloxane, dimethyl-terminated
Dimethylpolysiloxane
Dimeticona
Dimeticone
Dimeticonum
Dow Corning 1664
Mirasil DM 20
Ophtasiloxane
Poly(dimethylsiloxane)
Poly(oxy(dimethylsilylene)), alpha-(trimethylsilyl)-omega-methyl-
Polysilane
Viscasil 5M
Dimethicone
DIMETHICONE
poly(dimethylsiloxane)
polydimethylsiloxane
Trimethyl-trimethylsilyloxy-silane
Dimethyl silicone oil
9006-65-9
1-Oxa-2-silacyclohexane, 2,2-dimethyl- [ACD/Index Name]
2,2-Dimethyl-1,2-oxasilinan [German] [ACD/IUPAC Name]
2,2-Dimethyl-1,2-oxasilinane [ACD/IUPAC Name]
2,2-Diméthyl-1,2-oxasilinane [French] [ACD/IUPAC Name]
2,2-dimethyl-1-oxa-2-silacyclohexane
227-416-7 [EINECS]
5833-47-6 [RN]
1,1-DIMETHYL-1-SILA-2-OXACYCLOHEXANE
1-OXA-2-SILACYCLOHEXANE, 3,4-DIHYDRO-2,2-DIMETHYL-
2,2-dimethyloxasilinane
70131-67-8 [RN]
8050-81-5 [RN]
9006-65-9 [RN]
9016-00-6 [RN]
96304-54-0 [RN]
Dimethylsilaoxacyclohexane
MFCD00023112
