Description

Stearic Acid 2,3-Bis(Trimethylsilyloxy)Propyl Ester CAS NO 1188-75-6 is a specialized organosilicon derivative of stearic acid, designed for applications requiring enhanced hydrophobicity and thermal stability. This compound is valued for its ability to modify surface properties and act as a reactive intermediate in advanced material synthesis. It is primarily utilized by manufacturers in the silicone polymer, personal care, and specialty coatings industries seeking to impart specific functional characteristics to their products.

Application

• Silicone Polymer Modification: Acts as a functional additive or chain extender to tailor the hydrophobicity, lubricity, and release properties of silicone oils, rubbers, and resins.
• Personal Care & Cosmetics: Serves as an emollient, skin-conditioning agent, and water-repellent ingredient in formulations like sunscreens, antiperspirants, and long-wear makeup.
• Specialty Coatings & Surface Treatments: Used to create hydrophobic and oleophobic surface coatings on textiles, paper, and various substrates.
• Release Agents & Lubricants: Functions as a high-performance internal or external mold release agent and lubricant in plastics and rubber processing.
• Chemical Synthesis Intermediate: Employed in organic synthesis for introducing silyl-protected diol and long alkyl chain functionalities into target molecules.
• Adhesive & Sealant Formulations: Imparts improved water resistance and adhesion properties in silicone-based adhesive and sealant products.

Basic Information

Product Name	Stearic Acid 2,3-Bis(Trimethylsilyloxy)Propyl Ester
CAS No.	1188-75-6
Molecular Formula	C27H58O4Si2
Molecular Weight	502.9 g/mol
Synonyms	2,3-Bis(trimethylsiloxy)propyl stearate; Octadecanoic acid, 2,3-bis[(trimethylsilyl)oxy]propyl ester; Propylene glycol monostearate bis(trimethylsilyl) ether; Stearic acid 2,3-bis-O-(trimethylsilyl)glyceryl ester; Glyceryl 1-stearate 2,3-bis(trimethylsilyl) ether; TMS-protected glyceryl monostearate; 1-Stearoyl-2,3-bis-O-trimethylsilylglycerol
EINECS	Contact for details

Quality Control

Our Stearic Acid 2,3-Bis(Trimethylsilyloxy)Propyl Ester is produced under a strict quality management system. Each batch undergoes rigorous analytical testing, including chromatography and spectroscopy, to ensure high purity and consistent performance. Comprehensive Certificates of Analysis (COA) detailing identity, assay, and impurity profiles are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); ensure containers are sealed immediately after use to minimize exposure to atmospheric humidity.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC/HPLC)	≥ 95.0%
Water Content (KF)	≤ 0.5%
Refractive Index (20°C)	1.4400 - 1.4450
Density (20°C)	0.90 - 0.95 g/mL

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.