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Dimethyl Silicone Oil

D5 Cyclo-2245-Cyclomethicone Fluid

Chemical Name:Polydimethylsiloxane Fluid / PDMS Silicone Oil
Product Category:Cyclomethicones Silicone Fluids
Structural Formula:silicone-oil-63148-62-9-_11_65_b_116566
CAS No.:CAS No. 63148-62-9
Molecular Formula:C6H18OSi2
Molecular Weight:162.38 g/mol

D5 Cyclo-2245-Cyclomethicone Fluid

 (D5) Cyclo‐2245-Cyclomethicone is a polydimethylcyclosiloxane that is composed of Decamethylcyclopentasiloxane (CAS# 541‐02‐6). The product is clear, tasteless, essentially odorless, non‐greasy and non‐stinging.

Due to their volatility (varying rates of evaporation), low surface tensions (high Spreadability), and non-greasy feel, Cyclomethicones are used as base fluids, carrying agents and wetting agents in a wide range of personal care products. Cosmetic applications include: room sprays, body sprays, antiperspirants, skin creams, skin lotions, suntan lotions, bath oils, hair care products etc. see also Cosmetic Grade Silicones

Product Data:

Chemical nameDecamethylcyclopentasiloxane
CAS No.556-67-2
AppearanceColorless liquid
Specific gravity @25°C0.954
Viscosity at 25°C4.0
Refractive index1.397
Surface tension18.0
Flash point-closed cup77°C / 170.6ºF
Freeze point-40°C
Boiling point @ 760mmHg210°C
Vapor pressure1.0mmHg (20ºC)
Evaporation rate (buty acetate=1)<1
Heat of vaporization @25°C157
Cyclotetrasiloxane (D4) content<1.0%


  • Clear, colorless, odorless fluid
  • Cosmetic grade…excellent for base fluids in cosmetic formulations
  • Volatile carrier (100% evaporation at room temperature)..leaves no residue
  • Low heat of vaporization…non-stinging and will not cool the skin when it evaporates
  • Excellent lubricity before evaporation
  • Low surface tension fluids (high spreadability)
  • Exempt from federal VOC regulations (inlcuding CARB)…replacement for petroleum based solvents that are not VOC Compliant
  • VOC Exempt Solvent for low solvency applications
  • Miscible with virtually all polydimethylsiloxane fluids and most petroleum based fluids
  • Soluble in most anhydrous alcohols, waxes, oils (except castor), hydrocarbon oils, esters and silicone fluid.
  • Insoluble in water

Packaging Specifications

Packaging Specifications
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D5 Cyclo-2245-Cyclomethicone Fluid

Cyclomethicone Fluids are exempt from Federal VOC regulations (including CARB and OTC) and will not contribute to ozone-depletion and global warming. They are being widely accepted as replacements for non-VOC complaint petroleum-bases solvents as both carrying agents as well as for cleaning solvents. Cyclo-2245 is especially effective for applications where low to medium solvency power is desireable. As carrying agents, Cyclo-2244 and Cyclo-2245 have comparable evaporation rates to naptha solvents, odorless mineral spirits (OMS) as well as some of the isoparaffinic solvents. They are compatible with most substates, including metals and plastics.

In addition, D5 Cyclomethicone is being used as a Federal VOC Exempt cleaning agent in dry cleaning applications. It serves to act as a carrying agent for the detergent and will not degrade the fabric or colors of the linens and clothing like other stronger solvents.

Unlike D4 Cyclomethicone (Cyclo-2244), Cyclo-2245 (D5) has a much higher pour point and does not present the freezing concerns that D4 presents.

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