Isobutyl Polysilsesquioxane

AKA “Pentacyclo(9.5.1.13, 9.15, 15.17, 13)octasiloxane, octakis(2-methylpropyl)-, 1, 3, 5, 7, 9, 11, 13, 15-octakis(2-methylpropyl)-, Pentacyclo[9.5.1.13, 13]octasiloxane, RefChem:859707, 221326-46-1, PSS-OCTAISOBUTYL SUBSTITUTED 97, MFCD31010095, 15-Octakis(2-methylpropyl)-2, 4, 6, 8, 10, 12, 14, 16, 17, 18, 19, 20-dodecaoxa-1, 15-octasilapentacyclo[9.5.1.13, 13]icosane, OctaIsobutyl-POSS”

Ingredient

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Ingredient Facts

Isobutyl polysilsesquioxane

AKA: Pentacyclo(9.5.1.13, 9.15, 15.17, 13)octasiloxane, Octakis(2-methylpropyl)-, 1, 3, 5, 7, 9, 11, 13, 15-octakis(2-methylpropyl)-, Pentacyclo[9.5.1.13, 13]octasiloxane, RefChem:859707, 221326-46-1, PSS-OCTAISOBUTYL SUBSTITUTED 97, MFCD31010095, 15-Octakis(2-methylpropyl)-2, 4, 6, 8, 10, 12, 14, 16, 17, 18, 19, 20-dodecaoxa-1, 15-octasilapentacyclo[9.5.1.13, 13]icosane, OctaIsobutyl-POSS

Ingredient · Nail Conditioning · EWG: 4

Synthetic

Skin Conditioner

Silicone

Not Clean

Pentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane, 1,3,5,7,9,11,13,15-octakis(2-methylpropyl)-

Formula

C32H72O12Si8

Mol. Weight

873.60

CAS #

221326-46-1

Form

Liquid

See origin →

Functions

Nail Conditioning

A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.

Locks In Moisture

Antioxidant Protection

Strengthens nails

Traditional Use

Modern silicone-based polymer developed for cosmetics in the late 20th century. Used to provide a lightweight, silky texture and improved spreadability in skincare and color cosmetic formulations.