Description

S-(Octanoyl)Mercaptopropyltriethoxysilane is a specialized bifunctional organosilane coupling agent designed to create durable bonds between inorganic substrates and organic polymers. This compound is critical for enhancing the mechanical properties, adhesion, and long-term stability of composite materials in demanding environments. It is primarily utilized by manufacturers in the rubber, plastics, coatings, and sealants industries seeking to improve product performance and reliability.

Application

• As a coupling agent and crosslinker in sulfur-cured rubber compounds (e.g., tires, hoses, belts) to improve filler-matrix interaction and reduce heat buildup.
• To enhance the adhesion of coatings, inks, and adhesives to glass, metal, and mineral surfaces.
• As a surface modifier for silica and other mineral fillers in reinforced plastics and epoxy composites to increase strength and moisture resistance.
• In the formulation of high-performance sealants and caulks to ensure long-term elasticity and weather resistance.
• For the pretreatment of glass fibers and other reinforcements to optimize bonding in fiberglass composites.
• As a key intermediate in the synthesis of advanced silicone-modified polymers and resins.

Basic Information

Product Name	S-(Octanoyl)Mercaptopropyltriethoxysilane
CAS No.	220727-26-4
Molecular Formula	C17H36O4SSi
Molecular Weight	364.61 g/mol
Synonyms	3-[(Octanoylthio)propyl]triethoxysilane; Octanoylthiopropyltriethoxysilane; S-Octanoyl-3-mercaptopropyltriethoxysilane; Mercaptopropyltriethoxysilane S-octanoate; Silane coupling agent Si-266; KH-590 derivative; Octanoyl mercaptan silane; (Triethoxysilylpropyl) octanoyl sulfide
EINECS	Contact for details

Quality Control

Our production of S-(Octanoyl)Mercaptopropyltriethoxysilane adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Each lot is analyzed against comprehensive specifications, including purity, functional group content, and absence of critical impurities. A Certificate of Analysis (COA) documenting these results is provided with every shipment to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); containers must be kept tightly sealed to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	Clear to pale yellow liquid
Identification (IR)	Conforms
Assay (GC)	≥ 97.0%
Refractive Index (n20D)	1.440 - 1.450
Density (g/mL, 20°C)	0.98 - 1.02
Moisture (KF)	≤ 0.5%

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