Dimethicone- ▸ Damping fluid for torsional vibration dampers — crankshaft and driveline viscous dampers (heat- and shear-stable grades)
- ▸ Torque-transfer / viscous-coupling fluid
- ▸ High-end vibration / pulsation / torque damping — rotary dampers, control valves, dashpots, aviation gyroscopes
- ▸ Rotary / soft-close and precision motion-control dampers (hinges, lids, knobs) — viscosity sets damping torque
- ▸ Plastics slip and mold-release additive at the gum boundary (melt-blend masterbatch uses UHMW gum, not this fluid)
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 500,000 cSt is the apex damping and torque-transfer grade, sitting at the fluid-to-gum boundary. Its very high viscosity (and, in stabilized grades, heat and shear stability) makes it the regime for torsional vibration dampers and viscous torque coupling, plus high-end rotary and precision motion-control damping; it is also used as a direct plastics slip / mold-release additive.
Frequently Asked Questions
What does cSt mean for 500,000 cSt silicone oil?
cSt is centistokes, the kinematic-viscosity unit. At 500,000 cSt this dimethicone (PDMS, CAS 9006-65-9) is an extremely high-viscosity, slow-flowing fluid, far thicker than common 50-1,000 cSt grades. The number specifies flow resistance only, not chemical identity.
What is 500,000 cSt silicone oil used for?
High-viscosity PDMS at this grade is used as a damping fluid in mechanical systems such as tonearm cueing-lever and rotary dampers, and as a high-cling lubricant and additive where slow, controlled flow is required. Its low compressibility and stable viscosity over temperature suit precision damping applications.
Is silicone oil 500,000 cSt water soluble?
No. Dimethicone fluids are not water soluble; they are hydrophobic and immiscible with water. They are soluble in many organic and silicone solvents and form a separate phase in aqueous systems.
What is the CAS number and chemical identity of this silicone oil?
It is polydimethylsiloxane (PDMS / dimethicone), CAS 9006-65-9, repeat-unit formula (C2H6OSi)n. The 500,000 cSt designation reflects a high average chain length; the backbone chemistry is identical to lower-viscosity dimethicone grades.
What is the cost of bulk 500,000 cSt silicone oil and how is it packaged?
Pricing depends on volume, grade, and current market; RawSource quotes per requirement rather than a list price. Request a bulk quote and specify packaging (drum, tote/IBC) and target quantity. A CoA and SDS are provided with shipment.
