Isopropyl Isostearate is the propan-2-yl (isopropyl) ester of isostearic acid—chemically a branched, saturated C18 fatty-acid ester.

For formulators, the key feature is the branched isostearate moiety: reduced tight packing versus straight-chain analogs, which typically correlates with a liquid, light-feel ester that improves slip and spread without building a waxy/structural oil feel.

In cosmetic function terms, Isopropyl Isostearate is commonly positioned as a sensorial emollient and binding/wetting-distributing oil. It is frequently selected to optimize application glide, rub-out, and pigment wetting/dispersion—especially in color cosmetics and anhydrous systems.

Product description: Isopropyl Isostearate is a nonpolar ester oil that can help lower perceived greasiness while maintaining lubricity and cushion. In pigment-rich systems (e.g., lipsticks, balms, sticks, foundations, and other decorative cosmetics), it can support smoother payout and more elegant afterfeel by improving pigment wetting and reducing application drag. In emulsions, it is typically used as a sensorial “feel editor” within an emollient blend to soften heavy or waxy oil phases and improve spreadability.

From a stability/processing standpoint, branched saturated esters are often chosen for good oxidative stability and practical low-temperature handling (lower crystallization tendency). This makes Isopropyl Isostearate suitable for many heat-sensitive or odor/color-critical systems where a cleaner-feel ester is desired.

Usage: Color cosmetics (lip products, complexion products), anhydrous balms/sticks, creams/lotions as part of an emollient blend, and hair/toiletry systems where slip and non-greasy lubricity are needed.

Mixing method:

- Add to the oil phase or ester/oil blend; compatible with typical cosmetic oils and wax systems.

- Can be incorporated with heating if needed for wax dissolution; also suitable for post-add/cool-down incorporation when the system allows.

- For pigment dispersions, pre-wet pigments into Isopropyl Isostearate (alone or in an ester blend) under shear to improve dispersion and reduce drag.

Usage rate: 1–15%

Product characteristics: Clear to pale yellow oily liquid; low to mild characteristic odor.

Solubility: Soluble in oils and ester phases; not water-soluble. Use emulsification/solubilization approaches for aqueous systems.