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 is 500,000 cSt silicone fluid used for?
500,000 cSt silicone fluid (dimethicone / PDMS) is the apex damping and torque-transfer grade at the fluid-to-gum boundary: torsional vibration dampers, viscous torque coupling, high-end and precision motion-control dampers, and a direct plastics slip / mold-release additive. Viscosity directly sets the damping torque.
Is 500,000 cSt silicone fluid the same as dimethicone or silicone oil?
Yes — silicone fluid, silicone oil, dimethicone and PDMS all refer to the same linear polydimethylsiloxane (CAS 9006-65-9); 500,000 cSt is the viscosity grade. Because it is a polymer rather than a single molecule, properties are reported per grade rather than as one fixed molecular weight.
Is 500,000 cSt silicone oil flammable?
No. At a flash point of ≥ 315 °C (open cup) the 500,000 cSt grade is not classified as flammable, and mid- to high-viscosity PDMS is not otherwise GHS-classified. Only the volatile sub-5 cSt grades (and discrete volatiles like MM) are flammable. A grade-specific SDS ships with every order.
Identity and hazard data sourced from PubChem and authoritative regulatory references. Confirm against the grade-specific CoA and SDS supplied with every shipment.