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Cyclomethicone 5 is a cyclic siloxane, that has a silicon-oxygen bond in a cyclic arrangement and methyl groups attached with the silicon atom.
Cyclomethicone 5 is used in the production of some silicon-based polymers that are widely used in various personal care products.
Pharmaceutical secondary standards for application in quality control, provide pharma laboratories and manufacturers with a convenient and cost-effective alternative to the preparation of in-house working standards.
CAS: 541-02-6
MF: C10H30O5Si5
MW: 370.77
EINECS: 208-764-9
Synonyms
2,2,4,4,6,6,8,8,10,10-Decamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane;CD3770;cyclicdimethylsiloxanepentamer;Cyclopentasiloxane, decamethyl-;D3770;Decamethylcylopentasiloxane;siliconsf1202;unioncarbide7158siliconefluid
Cyclomethicone 5 is an organosilicon compound.
Cyclomethicone 5, also known as D5 and D5, is an organosilicon compound with the formula [(CH3)2SiO]5.
Cyclomethicone 5 is a colorless and odorless liquid that is slightly volatile.
Cyclomethicone 5 is a compound that is used in wastewater treatment.
Cyclomethicone 5 is used as a co-solvent in the removal of fatty acids from wastewater by adsorption on activated carbon.
Cyclomethicone 5 has been shown to be less toxic than other solvents, such as pergolide mesylate, and can be used for the removal of fatty acids from wastewater by adsorption on activated carbon.
The process involves the formation of Cyclomethicone 5 complexes at the surface of activated carbon particles.
Cyclomethicone 5 does not cause chronic exposure or emit particles when subjected to high temperatures.
Cyclomethicone 5 is a non-occlusive, non-greasy, volatile, polydimethylcyclosiloxane composed mainly of decamethylcyclopentasiloxane.
Cyclomethicone 5 acts as a solvent and detackifier.
Cyclomethicone 5 offers ease of spreading, soft, smooth, dry feel, non-cooling effect, volatility and non-oily residue.
Cyclomethicone 5 finds application in formulating creams, gels and medicated treatments for skin & scalp applications.
Cyclomethicone 5 Chemical Properties
Melting point: -44°C
Boiling point: 90 °C/10 mmHg (lit.)
Density: 0.958 g/mL at 25 °C (lit.)
Vapor pressure: 33.2Pa at 25℃
Refractive index: n20/D 1.396(lit.)
Fp: 162 °F
Storage temp.: 2-8°C
Solubility: <0.0001g/l (calculated)
Form: Liquid
Color: Colorless
Specific Gravity: 0.959
Explosive limit: 0.52-7%(V)
Water Solubility: Immiscible with water.
Hydrolytic Sensitivity 1: no significant reaction with aqueous systems
Merck: 14,2848
BRN: 1800166
Dielectric constant: 2.5（20℃）
Stability: Stable. Incompatible with strong oxidizing agents.
InChIKey: XMSXQFUHVRWGNA-UHFFFAOYSA-N
LogP: 8.07 at 24.6℃
CAS DataBase Reference: 541-02-6(CAS DataBase Reference)
NIST Chemistry Reference: Cyclomethicone 5 (541-02-6)
EPA Substance Registry System: Cyclomethicone 5 (541-02-6)
Uses
A cyclic volatile methylsiloxane (cVMS) used in cosmetic and personal care products.
Used in dermal exposure and inhalation toxicity study.
Cyclomethicone 5 is incorporated into a formulation for its emollient and solvent activity.
Octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane are major industrial products, which are either marketed as such or used for the production of polydimethylsiloxanes.
Intermediate in the manufacture of high mol wt siloxane polymers.
Carrier ingredient in personal care products; dry cleaning solvent.
Cyclomethicone 5 is classified as a cyclomethicone.
Such fluids are commonly used in cosmetics, such as deodorants, sunblocks, hair sprays and skin care products.
Cyclomethicone 5 is becoming more common in hair conditioners, as it makes the hair easier to brush without breakage.
Cyclomethicone 5 is also used as part of silicone-based personal lubricants.
Cyclomethicone 5 is considered an emollient.
In Canada, among the volume used in consumer products approximately 70% were for antiperspirants and 20% for hair care products.
10,000–100,000 tonnes per year of Cyclomethicone 5 is manufactured and/or imported in the European Economic Area.
Atmospheric emissions of D5 in the Northern Hemisphere were estimated to 30,000 tonnes per year.
Cyclomethicone 5 has also been tried as a dry-cleaning solvent in the early 2000s.
Cyclomethicone 5 was marketed as a more environmentally friendly solvent than tetrachloroethylene (the most common dry-cleaning solvent worldwide) despite being controlled in the EU for to its persistent, bioaccumulative and toxic characteristics.
Production and polymerization
Cyclomethicone 5 is produced from dimethyldichlorosilane.
Hydrolysis of the dichloride produces a mixture of cyclic dimethylsiloxanes and polydimethylsiloxane.
From this mixture, the cyclic siloxanes including Cyclomethicone 5 can be removed by distillation.
In the presence of a strong base such as KOH, the polymer/ring mixture is equilibrated, allowing complete conversion to the more volatile cyclic siloxanes:
[(CH3)2SiO]5n → n [(CH3)2SiO]5
where n is a positive integer.
D4 and Cyclomethicone 5 are also precursors to the polymer.
The catalyst is again KOH.
