Description

Octadecanoic Acid, 3-(Trimethylsiloxy)-, Methyl Ester is a specialized organosilicon-modified stearate derivative. This compound is valued for its unique ability to impart hydrophobic, lubricating, and release properties to various formulations. It is primarily sought after by manufacturers in the personal care, coatings, and polymer industries seeking advanced surface modification and processing aids.

Application

• As a key conditioning and emollient agent in high-performance hair care and skincare products.
• As an internal and external lubricant and release agent in plastic and rubber processing.
• As a water-repellent additive in coatings, paints, and textile finishes.
• As a surface modifier for pigments and fillers to improve dispersion in organic matrices.
• As a intermediate for the synthesis of more complex silicone-functional polymers and surfactants.
• In the formulation of mold release agents and anti-stick coatings for industrial applications.

Basic Information

Product Name	Octadecanoic Acid, 3-(Trimethylsiloxy)-, Methyl Ester
CAS No.	21987-13-3
Molecular Formula	C22H46O3Si
Molecular Weight	386.70 g/mol
Synonyms	Methyl 3-(trimethylsilyloxy)octadecanoate; Methyl 3-(trimethylsiloxy)stearate; 3-(Trimethylsiloxy)stearic acid methyl ester; Stearic acid, 3-(trimethylsiloxy)-, methyl ester; Silane, trimethyl[17-(methoxycarbonyl)heptadecyloxy]-; (3-Octadecanoyloxypropyl)trimethylsilane (related); Silicone stearate ester
EINECS	Contact for details

Quality Control

Our Octadecanoic Acid, 3-(Trimethylsiloxy)-, Methyl Ester is produced under a strict quality management system. Each batch undergoes rigorous analytical testing, including identity confirmation by IR and purity determination by GC or HPLC, to ensure consistent performance and reliability. Certificates of Analysis (COA) detailing all relevant specifications are available upon request.

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). Keep away from strong acids, bases, and oxidizing agents. This material is moisture-sensitive; keep container tightly sealed when not in use.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (GC)	≥ 95.0%
Refractive Index (20°C)	1.450 - 1.460
Density (20°C)	0.88 - 0.92 g/mL

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