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 →Silicone gum is an ultra-high-molecular-weight polydimethylsiloxane (PDMS / dimethicone, CAS 9006-65-9) — so long in chain length that it behaves as a soft, non-flowing gum rather than a pourable fluid. It sits at the very top of the silicone-oil viscosity ladder, beyond the heaviest fluids, and is valued where maximum substantivity, film strength and rheology are needed: as the base polymer for high-consistency silicone rubber (HCR) and as a heavy conditioning and shine agent in personal care (where it is delivered in a carrier blend). See the full ladder on the bulk silicone supplier hub.
What is silicone gum?
Silicone gum is the same dimethicone chemistry as silicone fluid, taken to a very high molecular weight. As the PDMS chain gets longer the material stops pouring and becomes a clear, tacky, elastic gum. It is the top end of the continuum that runs from volatile fluids through the heavy 100,000–500,000 cSt grades up to the gum. Gums are made in methyl-terminated, vinyl-functional (for crosslinking into rubber) and silanol/hydroxy-functional versions; specify the functionality your process needs.
Applications by sector
Silicone rubber (HCR). High-molecular-weight gum is the base polymer for high-consistency (heat-cured) silicone rubber: compounded with reinforcing silica and a curing agent, it is milled, then extruded or molded and cured into tubing, profiles, gaskets, keypads and other elastomer parts. Vinyl-functional gum provides the crosslink sites. Personal care. As a heavy conditioning and shine agent, silicone gum gives strong, durable slip and a high-gloss film on hair; because a raw gum cannot be pumped, it is supplied to formulators as a gum-in-fluid blend (for example dimethicone or cyclopentasiloxane carrier). This describes formulation feel and film, not a skin-health claim. Additives. Gum is also used as a high-rheology additive and antifoam/defoamer base. Match the form and functionality to the application.
Forms and grades
Silicone gum is supplied as a raw gum (for rubber compounders) or as a ready-to-use blend in a low-viscosity or volatile silicone carrier (for personal care and additive use). Specify methyl, vinyl or silanol functionality, the carrier and the gum content on the RFQ. Related grades: the heavy fluids up to 500,000 cSt, dimethicone, dimethiconol, and vinyl-terminated PDMS for rubber.
Handling and documentation
Silicone gum is water-insoluble and is handled in the silicone/oil phase or as a compounded solid. Each lot ships with a Certificate of Analysis (CoA); request the Safety Data Sheet (SDS) for physical-property and handling data.
Bulk supply and RFQ
RawSource supplies silicone gum — as raw gum or as a carrier blend — from domestic US stock to silicone-rubber compounders and personal-care formulators, with CoA and SDS per lot. Submit an RFQ with the functionality (methyl/vinyl/silanol), form and target quantity for a current quote. The full viscosity ladder is in the silicone oil viscosity guide.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| INCI / type | Dimethicone (ultra-high-molecular-weight PDMS gum) |
| CAS Number | 9006-65-9 |
| Chemical type | High-molecular-weight polydimethylsiloxane (methyl / vinyl / silanol functional) |
| Appearance | Clear, tacky, non-flowing gum (or clear blend in a carrier) |
| Consistency | Non-pourable gum — top of the viscosity ladder, beyond the heaviest fluids |
| Solubility | Insoluble in water; soluble/dispersible in silicones and many organic solvents |
| Flammability / handling | Refer to the current SDS |
Frequently Asked Questions
What is silicone gum?
Silicone gum is an ultra-high-molecular-weight polydimethylsiloxane (dimethicone, CAS 9006-65-9) so long-chained that it behaves as a non-flowing gum rather than a fluid. It is the base polymer for high-consistency silicone rubber and a heavy conditioning/shine agent in personal care.
What is silicone gum used for?
It is used as the base polymer for high-consistency (heat-cured) silicone rubber, as a substantive conditioning and shine agent in hair care (supplied as a gum-in-fluid blend), and as a high-rheology additive and antifoam base.
How is silicone gum different from silicone oil?
It is the same dimethicone chemistry at much higher molecular weight. Silicone oil pours; silicone gum does not — it is a tacky, elastic solid-like gum at the very top of the viscosity ladder, used for film strength, substantivity and as a rubber base rather than for spreading.
Is silicone gum supplied as a gum or a blend?
Both. Rubber compounders take the raw gum; personal-care and additive users take a ready-to-use blend in a low-viscosity or volatile silicone carrier, because raw gum cannot be pumped. Specify the form and functionality (methyl/vinyl/silanol) on the RFQ.
How is bulk silicone gum supplied and quoted?
RawSource supplies silicone gum as raw gum or as a carrier blend from domestic US stock, with CoA and SDS per lot. Pricing is quote-based on functionality, form and volume; submit an RFQ with your target quantity.
Disclaimer. Information on this page — including chemical properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot you purchase governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim, or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information.
