What is 50 cSt silicone oil used for?
Textile softening and thread/yarn lubrication, mold release, laboratory-bath and heat-transfer duty, and light damping. At 50 cSt the fluid penetrates and coats fibers evenly — flow and wet-out win over film durability. Typical spec: 0.960 specific gravity, ≥ 285 °C open-cup flash point.
Dimethicone- ▸ Lab bath / heat-transfer fluid: wide service range and low viscosity change with temperature; better convection than heavier grades
- ▸ Textile softening and water repellency: soft, velvety hand-feel while keeping fabric breathable
- ▸ Sewing-thread / yarn / spin-finish lubrication: lowers dynamic friction and reduces fiber breakage
- ▸ Mold release for rubber and plastic, and general heat-resistant lubrication of polymer parts
- ▸ Dielectric fluid, light damping medium and antifoam
Don’t see your viscosity? We can custom-formulate silicone fluid to your target cSt — tell us your spec.
Not sure which grade? Silicone oil viscosity guide (5 to 500,000 cSt) · All silicone oils
- ▸ Safety Data Sheet (SDS) PDF · SDS
- ▸ Typical Certificate of Analysis (CoA) PDF · COA
Values shown are typical for the current commercial grade. A lot-specific Certificate of Analysis accompanies every shipment; the grade-specific SDS is available on request.
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.
Cross-reference: comparable to XIAMETER PMX-200 Silicone Fluid 50 cSt (a Dow product): the same linear polydimethylsiloxane chemistry at the same nominal viscosity. RawSource is independent of Dow; confirm grade-critical specs against the RawSource TDS and lot CoA.
Silicone Oil 50 cSt sits at the light end of the mid band, where flow, fiber penetration and bath circulation matter more than film durability. It is favored for textile softening and thread/yarn lubrication, mold release, lab bath and heat-transfer duty, and as a dielectric and light damping medium.
Frequently Asked Questions
What is silicone oil 50 cSt used for?
50 cSt silicone oil (dimethicone / PDMS) is a light mid-band grade for textile softening and thread/yarn lubrication, mold release, laboratory-bath and heat-transfer duty, and light damping. It penetrates and coats fibers evenly — flow and wet-out over film durability.
Is 50 cSt silicone oil the same as dimethicone or PDMS?
Yes. Silicone oil, silicone fluid, dimethicone and PDMS all name the same linear polydimethylsiloxane (CAS 9006-65-9) — 50 cSt is the viscosity grade, not a different chemistry. Because PDMS is a polymer, properties are reported per grade rather than as one fixed molecular weight.
Is 50 cSt silicone oil flammable?
No. With a flash point of ≥ 285 °C (open cup), the 50 cSt grade sits far above GHS flammable-liquid cut-offs, and mid- and high-viscosity PDMS is not otherwise GHS-classified. Only the volatile sub-5 cSt silicone fluids are flammable. The grade-specific SDS ships with every order.
What is the CAS number for silicone oil 50 cSt?
Silicone oil 50 cSt carries CAS 9006-65-9, with repeating-unit formula (C2H6OSi)n; some manufacturers list the equivalent trimethylsiloxy-terminated PDMS under CAS 63148-62-9. The cSt figure is the viscosity grade, not a separate substance — all dimethicone grades share the same CAS registry.
What packaging is 50 cSt silicone oil supplied in?
Bulk only: 55-gallon drums, 275-gallon IBC totes, and 5-gallon pails, with pallet and full-truck quantities quoted on request. A lot-specific Certificate of Analysis accompanies every shipment; the grade SDS is available on request. Submit an RFQ with your target volume and packaging.