At NINGBO INNO PHARMCHEM CO.,LTD., we pride ourselves on offering not just ingredients, but comprehensive knowledge that empowers our clients. Octyldodecyl Stearoyl Stearate (ODSS), identified by CAS 90052-75-8, is a complex ester whose performance in cosmetic and industrial applications is rooted in its unique chemical and physical properties. Understanding these characteristics is crucial for effective formulation and product development.

The molecular structure of ODSS is key to its functionality. It is formed through the esterification of stearic acid (a saturated C18 fatty acid) with octyldodecanol, a branched C20 Guerbet alcohol. This combination results in a large, relatively symmetrical ester molecule with long, branched alkyl chains. The branched nature of the octyldodecyl group prevents tight packing, contributing to its liquid state at room temperature and its smooth, non-crystallizing behavior in formulations, which is advantageous for stability.

Physicochemically, ODSS exhibits several important traits. Its appearance is typically a light yellow transparent oily liquid. With a molecular weight of approximately 847.47 g/mol, it is a substantial molecule. Its extremely low water solubility and high octanol-water partition coefficient (logP ~25) indicate a strong lipophilicity, meaning it is highly compatible with oils and other non-polar substances but immiscible with water. This hydrophobicity is central to its emollient and skin-barrier functions.

The performance of ODSS is further characterized by its rheological properties. It has a relatively high viscosity (around 83 cP) for an ester, contributing to its efficacy as a thickener and its ability to impart a cushioned, luxurious texture. Its low spreading value means it stays where it is applied, enhancing its performance as a binder and emollient without migrating excessively.

Analytical characterization is vital for quality control and formulation development. Techniques such as FTIR spectroscopy are used to confirm the presence of the ester functional group (carbonyl stretch around 1740 cm⁻¹) and the long alkyl chains (CH₂ stretches around 2850-2920 cm⁻¹). ¹H and ¹³C NMR spectroscopy provide detailed structural confirmation, identifying the specific environments of protons and carbons within the molecule. Mass spectrometry, particularly HRMS, is used to verify the exact molecular weight and elemental composition, ensuring the purity and correct identity of the compound. Gas Chromatography (GC) or High-Performance Liquid Chromatography (HPLC) coupled with detectors like ELSD or MS are employed to assess purity and quantify any residual starting materials or by-products.

For formulators aiming to buy cosmetic raw materials, understanding these properties allows for informed selection and application. The consistent quality of Octyldodecyl Stearoyl Stearate from reputable suppliers like NINGBO INNO PHARMCHEM CO.,LTD. ensures that these desired characteristics are reliably delivered. The ester's unique combination of emolliency, pigment dispersion, binding capabilities, and favorable rheological profile makes it a highly versatile ingredient, supporting innovation in both skincare and makeup products.