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CAS 14814-09-6

3-Mercaptopropyltriethoxysilane

Chemical Name: 3-Mercaptopropyltriethoxysilane
Product Category: Mercapto silanes | Silane Coupling Agent
Structural Formula: 14814-09-6
CAS No.: 14814-09-6
EINECS: 238-883-1
Molecular Formula: C₉H₂₂O₃SSi
Molecular Weight: 238.42 g/mol
Appearance: Colorless to Almost colorless

3-Mercaptopropyltriethoxysilane Description

3-Mercaptopropyltriethoxysilane (CAS 14814-09-6) is a highly efficient silane coupling agent with extensive applications in rubber manufacturing, polymer modification, and surface treatments. It enhances mechanical properties, improves adhesion, and increases chemical resistance in various formulations. 

Chemical Name3-Mercaptopropyltriethoxysilane
Synonymsγ-Mercaptopropyltrimethoxysilane, 3-Mercaptopropyltrimethoxysilane
Boiling Point210°C
Density0.987 g/mL at 20°C
Flash Point88°C
Refractive Index1.4331 at 25°C
SolubilityHydrolyzes slowly in water; soluble in alcohols, ketones, aliphatic and aromatic hydrocarbons
Applications
  • Silane Coupling Agent: Enhances adhesion between inorganic fillers (e.g., silica, clay, glass, mica, talc) and sulfur-cured elastomers like polysulfide and polyurethane sealants, improving mechanical properties such as modulus, tensile strength, and abrasion resistance.

  • Rubber Industry: Improves properties of mineral-filled elastomers, including tensile and tear strength, heat buildup, abrasion resistance, resilience, and compression set. Commonly used in products like shoe soles, rollers, wheels, and wire and cable insulation.

  • Surface Treatment: Acts as a pretreatment on minerals or is added during compounding to enhance low-rolling resistance in silica-reinforced tire tread compounds.

  • Polymer Modification: Serves as an intermediate in polymer and tire manufacturing, and as a laboratory reagent.

Safety Information
  • Hazard Classification: Irritant (Xi)

  • Risk Phrases: R36/37/38 – Irritating to eyes, respiratory system, and skin.

  • Safety Phrases: S26 – In case of contact with eyes, rinse immediately with plenty of water and seek medical advice; S36 – Wear suitable protective clothing.

  • Storage: Store in a cool, dry place between 2-8°C, in tightly sealed containers to prevent moisture exposure.

  • Handling: Use appropriate personal protective equipment (PPE), including gloves and goggles, to prevent skin and eye contact.

Packaging
  • Our standard packing is net 25kg / 200 kg drums / 1000kg/IBC,or according to your requirements.
Sample
  • Provided for free
Inventory items
  • 2 tons
Price

Packaging Specifications

Packaging Specifications

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3-Mercaptopropyltriethoxysilane: Guide

3-Mercaptopropyltriethoxysilane (CAS 14814-09-6) is a bifunctional organosilane with a mercapto (-SH) and a triethoxysilyl (-Si(OCH₂CH₃)₃) group. It enhances adhesion between organic and inorganic materials, making it a valuable coupling agent.

Applications:

  • Rubber & Tires: Improves silica dispersion, adhesion, and durability.

  • Adhesives & Sealants: Enhances bonding strength and flexibility.

  • Surface Treatment: Modifies inorganic surfaces for better compatibility.

Widely used in rubber, coatings, and adhesives, it enhances durability, adhesion, and processing efficiency.

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