A crosslinked silicone resin in spherical-powder form that rolls between surfaces for slip and a soft-focus, matte finish. It is used as a bulking agent and slip modifier that imparts a smooth, dry, soft-focus feel in color cosmetics and skin-care formulations.
▸Soft-focus/mattifying: Diffuses light and reduces shine.
▸Bulking agent: Adds powder volume and texture.
Physical Properties
appearance
White fine powder (spherical particles), typical
physical_form
Solid powder
empirical_repeat_unit
(CH3SiO1.5)n
median_particle_size
0.7-12 um (grade-dependent), typical
true_density
~1.3 g/cm3, typical
refractive_index
~1.42, typical
water_solubility
Insoluble
organic_solvent_solubility
Insoluble in common organic solvents
thermal_stability
Stable to ~250 C, typical
Safety & Handling
Full SDS 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.
🌐Harmonized System (HS) Code — 6-digit international heading
3910.00
Chapter 39
Plastics and articles thereof
Heading 39.10
Internationally harmonized (WCO HS)
Subheading 3910.00
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
68554-70-1
INCI Name
POLYMETHYLSILSESQUIOXANE
Synonyms & Trade Names
Poly(methylsilsesquioxane)Methylsilsesquioxane resinMethyl silsesquioxaneSilsesquioxanes, MeMethylsilicone resinPMSQComparable to Tospearl (Momentive)
Full Description
Polymethylsilsesquioxane (CAS 68554-70-1) is a crosslinked methylsilsesquioxane silicone resin, typically supplied as fine spherical powder. It is used as a bulking agent and slip modifier that imparts a smooth, dry, soft-focus feel in color cosmetics and skin-care formulations.
Frequently Asked Questions
What is polymethylsilsesquioxane used for?
Polymethylsilsesquioxane (CAS 68554-70-1) is a crosslinked silicone resin, typically fine spherical powder, used as a slip modifier, soft-focus/mattifying agent, and bulking agent in color cosmetics and skin-care formulations.
Is polymethylsilsesquioxane a silicone?
Yes. It is a crosslinked methylsilsesquioxane silicone resin (CAS 68554-70-1) supplied as spherical powder, distinct from fluid silicones like polydimethylsiloxane.
How does polymethylsilsesquioxane differ from polydimethylsiloxane?
Polydimethylsiloxane is a linear silicone fluid, while polymethylsilsesquioxane is a crosslinked resin in spherical powder form. The spherical particles deliver dry slip and light-diffusing soft-focus that a fluid cannot.
What is the HS code for polymethylsilsesquioxane?
It classifies under HS 3910.00 (silicones in primary forms). Confirm the final classification with your customs broker for the specific powder grade.
What is the cost of bulk polymethylsilsesquioxane?
Pricing depends on particle-size grade and order volume. Request a current quote from RawSource specifying grade and volume; a CoA and SDS accompany each shipment.
Disclaimer. Information on this page — including 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/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased 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. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.
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