CYCLOPENTASILOXANE/D5

Description

CYCLOPENTASILOXANE/D5 · CAS 541-02-6 · C10H30O5Si5. UNII 0THT5PCI0R. Boiling Point: 210 °C; Melting Point: -38 °C; Flash Point: 73 °C (163 °F) - closed cup.

Identification

CAS Registry Number	541-02-6
PubChem CID	10913
Molecular formula	C10H30O5Si5
IUPAC name	2,2,4,4,6,6,8,8,10,10-decamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane
UNII (FDA)	0THT5PCI0R

Computed Descriptors

Molecular Weight	370.77
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	5
Rotatable Bond Count	0
Exact Mass	370.09395673
Monoisotopic Mass	370.09395673
Topological Polar Surface Area	46.2
Heavy Atom Count	20
Formal Charge	0
Complexity	258

Physical & Chemical Properties

Boiling Point	210 °C
Melting Point	-38 °C
Flash Point	73 °C (163 °F) - closed cup
Solubility	In water, 1.7X10-2 mg/L at 25 °C
Density	0.9593 g/cu cm at 20 °C
Vapor Pressure	0.2 [mmHg]
Viscosity	3.9 cSt at 25 °C
Surface Tension	18.5 dyne/cm at 25 °C

Physical description & handling notes

• CBI; Liquid
• Colorless volatile liquid; [Merck Index]
• Colorless volatile liquid
• 0.3 mm Hg at 25 °C (OECD Guideline 104, Static Method Ebuliometer)
• log Kow = 8.06 (average of 8.03, 8.07 and 8.09 measurements)
• Henry's Law constant = 33.0 atm-cu m/mole at 25 °C

Regulatory Status

Regulatory & Food Contact	FDA Cumulative Estimated Daily Intake (CEDI): FCS DECAMETHYLCYCLOPENTASILOXANE (D5) CIR / INCI: Cosmetics ingredient -> Antioxidant; Conditioning/Emollient; Moisturizing/Humectant; Other (Specify); Preserva CIR / INCI: Cosmetic ingredients (Cyclopentasiloxane) -> CIR (Cosmetic Ingredient Review) CIR / INCI: Hair conditioning; Emollient; Solvent
GHS notification summary	97% (4427 / 4565)

GHS Hazard Classification

GHS notification summary	97% (4427 / 4565)
Reported hazard statements	H227, H373, H413

Documented Uses

• CIR ingredient: Cyclopentasiloxane
• Used as a carrier in personal care products, as a dry cleaning solvent, and to make siloxane polymers; [Merck Index]
• Intermediate in the manufacture of high molecular weight siloxane polymers. Carrier ingredient in personal care products; dry cleaning solvent.
• Field of application: Fuel additives; surface treatment, cleaning/washing agents; fillers; impregnation material; adhesives; binding agents; paints; laquers and varnishes; reprographic agents; softeners; surface active agents; process regulators. /From table/
• Commonly used as volatile excipient in cosmetic products including antistatic, emollient, humectant, solvent, viscosity controlling and hair conditioning ... The main use of D5 in cosmetic products is in skin care products, deodorants/antiperspirants, hair care products and make up products.
• Decamethylcyclopentasiloxane is used in cosmetics and toiletries.

Synonyms

DECAMETHYLCYCLOPENTASILOXANE; 541-02-6; Cyclomethicone 5; Dimethylsiloxane pentamer; Dow corning 345; Cyclic dimethylsiloxane pentamer; NUC silicone VS 7158; Silicon SF 1202; Ciclopentasiloxane; Cyclomethicone D5; Dekamethylcyklopentasiloxan; D5-sil; KF 995; DTXSID1027184; VS 7158; 0THT5PCI0R

Frequently Asked Questions

What are the CAS number and molecular formula of CYCLOPENTASILOXANE/D5?

CAS 541-02-6; molecular formula C10H30O5Si5; molecular weight — g/mol.

What other names is CYCLOPENTASILOXANE/D5 known by?

DECAMETHYLCYCLOPENTASILOXANE, 541-02-6, Cyclomethicone 5, Dimethylsiloxane pentamer, Dow corning 345, Cyclic dimethylsiloxane pentamer.

What is the regulatory status of CYCLOPENTASILOXANE/D5?

Documented regulatory listings: FDA Cumulative Estimated Daily Intake (CEDI): FCS; DECAMETHYLCYCLOPENTASILOXANE (D5); CIR / INCI: Cosmetics ingredient -> Antioxidant; Conditioning/Emollient; Moisturizing/Humectant; Other (Specify); Preserva.

Is CYCLOPENTASILOXANE/D5 classified as hazardous?

97% of GHS notifications report no hazard classification (4427 of 4565).

What are the key physical properties of CYCLOPENTASILOXANE/D5?

Boiling Point: 210 °C; Melting Point: -38 °C; Flash Point: 73 °C (163 °F) - closed cup; Solubility: In water, 1.7X10-2 mg/L at 25 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.