Description

Octadecyl Terminated Polydimethylsiloxane (20-30 cSt) is a specialized organomodified silicone fluid, distinguished by its long-chain alkyl termination on a polydimethylsiloxane backbone. This unique structure provides exceptional compatibility with organic systems and imparts superior lubricity, water repellency, and release properties. It is a critical performance additive for formulators in the personal care, coatings, plastics, and textile industries seeking to enhance surface characteristics and processing efficiency.

Application

• Internal & External Lubricant for Plastics: Enhances flow and mold release in engineering plastics and thermoplastic elastomers (TPEs), reducing processing torque and improving surface finish.
• Water-Repellent Additive for Coatings & Textiles: Imparts durable hydrophobicity and a soft, dry feel to fabrics, leather, and surface coatings.
• Conditioning Agent in Personal Care: Used in hair care and skincare formulations to provide exceptional shine, softness, and combability without greasiness.
• Defoamer/Process Aid: Acts as an efficient defoaming component in aqueous and non-aqueous systems, including paints, adhesives, and industrial process fluids.
• Rubber & Silicone Release Agent: Provides excellent non-stick properties for molding and extrusion of rubber and silicone products.
• Fiber & Yarn Lubricant: Reduces friction and static in synthetic fiber spinning and textile manufacturing processes.

Basic Information

Product Name	Octadecyl Terminated Polydimethylsiloxane (20-30 cSt)
CAS No.	128446-57-1
Molecular Formula	CnH2n+2OmSim (Polymeric)
Molecular Weight	Varies by chain length
Synonyms	Stearyl Terminated PDMS; Octadecyl Dimethylsiloxy Terminated Dimethyl Siloxane; Alkyl-modified Silicone Oil; C18-Alkyl Silicone Fluid; Poly(dimethylsiloxane), mono-C18-alkyl-terminated; Stearyl Silicone; Alkyl Functional Silicone
EINECS	Contact for details

Quality Control

Our Octadecyl Terminated Polydimethylsiloxane is manufactured under a strict quality management system. Each batch is tested to ensure consistent viscosity, purity, and functional performance. A comprehensive Certificate of Analysis (COA) documenting key physical and chemical parameters is provided with every shipment to guarantee compliance with your specifications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents. Under these conditions, the product has excellent shelf stability.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Viscosity (25°C)	20 - 30 cSt
Specific Gravity (25°C)	0.85 - 0.92
Refractive Index (25°C)	1.400 - 1.410
Flash Point	> 150 °C
Octadecyl Content	Confirmed by NMR

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