- ▸ Used as an antifoam and defoamer to knock down and suppress foam in process streams, coatings, adhesives, agrochemical formulations, and cleaning chemistries at low dose rates.
- ▸ Serves as a slip, release, and mold-release agent that lowers surface friction and prevents sticking in rubber, plastics, and composite molding operations.
- ▸ Functions as a dielectric and heat-transfer fluid in transformers, capacitors, and thermal-management systems thanks to its wide service-temperature range and electrical insulating behavior.
- ▸ Provides dry, non-greasy lubrication for plastics, elastomers, and light mechanical assemblies where mineral oils would swell or stain the substrate.
- ▸ Acts as a conditioning and slip additive in personal-care and HI&I cleaning formulations (cosmetic/dimethicone grades), imparting smooth feel, water repellency, and gloss.
- ▸ 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.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Cross-reference: comparable to the XIAMETER PMX-200 Silicone Fluid series (a Dow product): the same linear polydimethylsiloxane chemistry across the viscosity ladder. RawSource is independent of Dow; match your target viscosity grade against the RawSource TDS and lot CoA.
Polydimethylsiloxane (PDMS) fluid is the workhorse silicone oil — a clear, inert, thermally stable fluid used for lubrication, release, defoaming, water-repellency and as a formulation ingredient across many industries, available in a range of viscosities. Identity: CAS 63148-62-9.
What it is
Polydimethylsiloxane (CAS 63148-62-9, (C2H6OSi)n) is a linear silicone polymer supplied as a clear, odorless fluid across a wide viscosity range (commonly given in centistokes). It is chemically inert, thermally and oxidatively stable, and low in surface tension.
Industrial uses
PDMS fluid is used as a lubricant and release agent (mould release, anti-stick), a defoamer/antifoam base, a water-repellent and surface treatment, a dielectric and heat-transfer fluid, a polish and shine additive, a process aid and slip additive in plastics, and a formulation ingredient in personal-care products (conditioning and spreadability functions). Viscosity grade is chosen for the application.
See the bulk silicone supplier guide for the silicone range.
Forms, grades and handling
PDMS fluid is supplied in a range of viscosity grades (e.g. low to high cSt) in drums, IBCs and bulk; specify the viscosity. Properties are typical reference values; the Certificate of Analysis (CoA) for the lot you buy governs. Always consult the current Safety Data Sheet (SDS) before handling, and confirm regulatory status and suitability for your application and jurisdiction. Each lot ships with CoA, TDS and SDS.
Bulk supply and RFQ
RawSource sources Polydimethylsiloxane direct from producers in bulk, with CoA, TDS and SDS per lot. Tell us the grade, particle size or specification and quantity you need, and we will quote it. Products are sold for industrial and professional use.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| Chemical / class | Silicone fluid |
| CAS Number | 63148-62-9 |
| Molecular Formula | (C2H6OSi)n |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU): Not determined from public registry
- EC number: 687-578-3
TSCA Inventory flag XU: a substance exempt from reporting under the Chemical Data Reporting Rule (40 CFR 711) (EPA flag legend).
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is polydimethylsiloxane (PDMS) fluid used for?
PDMS fluid (CAS 63148-62-9) is a silicone oil used as a lubricant and release agent, a defoamer base, a water-repellent and surface treatment, a dielectric/heat-transfer fluid, a slip additive in plastics, and a personal-care formulation ingredient. RawSource supplies it in a range of viscosity grades for industrial use.
Which viscosity of PDMS should I use?
Viscosity (cSt) is selected for the application — lower viscosities for spreadability, penetration and personal care; higher viscosities for lubrication, damping and release. Tell us your application and we will quote the grade.
How is bulk polydimethylsiloxane (PDMS) fluid supplied and quoted?
RawSource supplies polydimethylsiloxane (PDMS) fluid in bulk with CoA, TDS and SDS per lot. Pricing is quote-based on grade, particle size/specification and volume; submit an RFQ with your application and quantity.
What is the REACH and TSCA regulatory status of Polydimethylsiloxane (PDMS) Fluid?
Polydimethylsiloxane (PDMS) Fluid (CAS 63148-62-9) is listed as Active on the U.S. EPA TSCA Inventory; its REACH registration status is not determined from the public ECHA registry.