Dimethicone- ▸ Personal-care spreading carrier: base fluid for antiperspirants, lotions and hair/skin care — light, non-greasy feel with no residue
- ▸ Low-temperature bath & heat-transfer fluid: lowest viscosity that resists evaporation in open baths (service ~-70 to 150 °C)
- ▸ Dielectric / electrical insulating fluid: impregnates and cools tight windings and assemblies
- ▸ Release & light lubrication for plastic, rubber and foam parts (not for steel-on-steel)
- ▸ Antifoam base oil and water-repellent glass / lens coating
Mid- and high-viscosity polydimethylsiloxane fluids (>= 5 cSt) are reported as not meeting GHS hazard-classification criteria. The grade-specific SDS governs. A full SDS is supplied with every shipment and on request; hazard status is confirmed against the grade-specific SDS.
Silicone Oil 5 cSt is the lightest non-volatile linear PDMS (dimethicone) grade. Its low molecular weight and low surface tension give fast spreading, easy wet-out and a light, dry, non-greasy feel, which makes it the workhorse thin-film carrier: a spreading agent in personal care, a low-temperature bath and dielectric fluid, an antifoam base oil, and a light release and water-repellent film for plastics and glass.
Frequently Asked Questions
What does cSt mean in silicone oil?
cSt is centistokes, the unit of kinematic viscosity. For silicone oil (PDMS, CAS 9006-65-9) it indicates how thin or thick the fluid is; 5 cSt is a very low-viscosity, thin and volatile-leaning grade compared with heavier fluids.
What is silicone oil 0.65 cSt versus 5 cSt?
Both are low-viscosity dimethicone (PDMS) fluids; 0.65 cSt is the thinnest, most volatile grade, while 5 cSt is slightly heavier and less volatile. They share CAS 9006-65-9 and differ only in chain length and the resulting viscosity.
What is silicone oil 5 cSt used for?
Low-viscosity PDMS grades like 5 cSt are used where a thin, fast-spreading silicone fluid is needed, such as in lubrication, release, and personal-care formulation. Suitability depends on your application, so match the grade to your formulation.
What is the CAS number for silicone oil 5 cSt?
Silicone oil (dimethicone, PDMS) carries CAS 9006-65-9 with repeating-unit formula (C2H6OSi)n. The 5 cSt label is the viscosity grade, not a separate CAS; all dimethicone viscosity grades share this number.
Can silicone oil 5 cSt be supplied in bulk?
Yes. RawSource supplies 5 cSt silicone oil in drum, tote, and IBC quantities to manufacturers. Request a bulk quote with your target volume and packaging; CoA and SDS are available on request.
