Cyclo-2345 D5 / D6 Cyclomethicone Fluid

Chemical Name: Cyclomethicone (Decamtehylcyclopentasiloxane & Dodecamethylcyclohexasiloxane)

INCI Name: Cyclomethicone (Cyclopentasiloxane & Cyclohexasiloxane)

CAS No: 541-02-6 | CAS No. 540-97-630

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Availability: 1-gallon (3.45kg), 5-gallon (17kg) & 55-gallon drums (190kg)

Product Equivalent: Dow Corning® 345 Fluid & GE SF1256, (comparable to GE SF 1257 & GE SF 1258)

Use:Cyclo-2345 D5/D6 Cyclomethicone is a volatile polydimethylcyclosiloxane (Cyclomethicone) that is composed of approximately 75% Cyclopentasiloxane (CAS #541-02-6) and approximately 25%of Dodecamethylcyclohexasiloxane (CAS# 540-97-630 ). The fluid 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

Cyclomethicone Fluids are exempt from Federal VOC regulation-s including California (CARB) and OTV VOC regulations. They do not contribute to ozone-depletion and global warming, and are being widely accepted as replacements for Non-VOC petroleum-based solvents. 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. Cyclo-2345 can be an alternative if a slower evaporation rate is desirable. Cyclomethicones are compatible with most substates, including metals and plastics.

Product Data:

Chemical name Cyclopentasiloxane & Cyclohexasiloxane
CAS No. CAS #541-02-6, CAS#540-97-630
Appearance Colorless, odorless fluid
Specific gravity @25°C 0.960
Viscosity at 25 at 25°C 4.5cSt
Refractive index 1.398
Surface tension 20.8
Flash point-closed cup 82°C
Boiling point @ 760mmHg 217°C
Heat of vaporization @25°C (kJ/kg) 157


  • 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
  • Excellent lubricity before evaporation
  • Low surface tension fluids (high spreadability)
  • Exempt from federal VOC regulations (including CARB and OTC)…replacement for petroleum based solvents that are not VOC Compliant
  • 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