Description

Trimethylsilyl Stearate is a high-purity organosilicon derivative of stearic acid, functioning as an effective silylating agent and hydrophobic modifier. This compound is valued for its ability to impart water repellency, improve lubricity, and enhance compatibility in complex formulations. It serves as a critical intermediate and additive for manufacturers in the personal care, polymer, and specialty chemical industries seeking advanced surface modification and process stability.

Application

• Surface Modification Agent: Imparts durable water repellency and release properties to textiles, paper, and mineral fillers.
• Internal/External Lubricant for Polymers: Enhances processability and mold release in engineering plastics and thermoplastic elastomers.
• Silylating Reagent: Protects hydroxyl groups in organic synthesis and pharmaceutical intermediate production.
• Personal Care Ingredient: Used in cosmetics and skincare formulations as a water-resistant agent and emollient.
• Coating Additive: Improves slip, abrasion resistance, and hydrophobic character in paints and industrial coatings.
• Adhesive & Sealant Modifier: Enhances moisture resistance and adhesion properties in silicone-based systems.

Basic Information

Product Name	Trimethylsilyl Stearate
CAS No.	18748-91-9
Molecular Formula	C₂₁H₄₄O₂Si
Molecular Weight	356.66 g/mol
Synonyms	Stearic Acid Trimethylsilyl Ester; Octadecanoic Acid Trimethylsilyl Ester; TMS-Stearate; Trimethylsilyl Octadecanoate; N-Trimethylsilylstearamide (common misnomer); TMSA (abbreviation); Silylating Agent S-18
EINECS	242-549-8

Quality Control

Our Trimethylsilyl Stearate is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including assay (GC/HPLC), identity confirmation (IR, NMR), and impurity profiling, to ensure it meets precise customer specifications. A Certificate of Analysis (COA) documenting purity, physical properties, and test results is provided with each shipment to guarantee traceability and compliance.

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). The product is moisture-sensitive; keep the container tightly sealed when not in use to prevent degradation.

Specification

Item	Specification
Appearance	White to off-white waxy solid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Melting Point	20 - 25 °C
Heavy Metals	< 10 ppm

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