Description

Bis[3-(Triethoxysilyl)Propyl] Polysulfides is a key organosilane coupling agent and sulfur donor, widely recognized by its CAS number 211519-85-6. This compound is essential for creating durable chemical bridges between inorganic materials and organic polymers, significantly enhancing composite performance. It is a critical raw material for manufacturers in the rubber, adhesive, sealant, and specialty coatings industries seeking to improve mechanical properties, adhesion, and aging resistance.

Application

• Rubber Compounding: Primary use as a sulfur donor and coupling agent in silica-filled tire tread compounds (green tire technology) to reduce rolling resistance and improve wet grip.
• Adhesives & Sealants: Enhances adhesion to glass, metals, and mineral substrates in high-performance construction and industrial formulations.
• Composite Materials: Improves the interfacial bonding and mechanical strength in fiberglass-reinforced plastics (FRP) and mineral-filled polymer composites.
• Coatings: Used as an adhesion promoter in corrosion-resistant and primer coatings for improved durability on challenging surfaces.
• Mineral Treatment: Functions as a surface modifier for fillers like silica, clay, and talc to improve their compatibility and dispersion in polymer matrices.
• Crosslinking Agent: Serves as a crosslinker in silicone and other polymer systems to modify elasticity and thermal stability.

Basic Information

Product Name	Bis[3-(Triethoxysilyl)Propyl] Polysulfides
CAS No.	211519-85-6
Molecular Formula	C18H42O6SxSi2 (x typically 2-4)
Molecular Weight	Variable, based on sulfur chain length (x). Contact for details.
Synonyms	Bis(3-triethoxysilylpropyl) polysulfide; Si 266; TESPT; Bis[3-(triethoxysilyl)propyl] tetrasulfide; Bis(triethoxysilylpropyl) disulfide; Sulfur-bridged silane coupling agent; TESPD; 3,3'-(Tetrasulfanediyl)bis(1-propanetriyl) triethyl ether
EINECS	Contact for details.

Quality Control

Our production of Bis[3-(Triethoxysilyl)Propyl] Polysulfides adheres to stringent quality management protocols. Each batch undergoes rigorous analytical testing, including assay, sulfur content analysis, and impurity profiling, to ensure consistency and performance. Certificates of Analysis (COA) documenting key parameters are available for 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 product is hygroscopic (moisture-sensitive); containers must be kept tightly sealed to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	Clear, pale yellow to light brown liquid
Identification (IR)	Conforms
Assay (by GC or Titration)	≥ 95.0%
Sulfur Content	Variable by grade (e.g., ~22% for tetrasulfide)
Specific Gravity (20°C)	1.07 - 1.09
Refractive Index (n20D)	1.457 - 1.467

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