Silane SI-619, chemically known as Bis[3-(triethoxysilyl)propyl]tetrasulfide (CAS No. 40372-72-3), is a bifunctional organosilane widely utilized in the rubber industry. It serves as a coupling agent, enhancing the bonding between inorganic fillers and organic polymers, thereby improving the mechanical properties of rubber compounds.
Silane SI69 (Evonik)
TESPT (Tetraethylorthosilicate)
SiSiB® PC2000 (SinoSi)
SCA-S69X (Nanjing Capatue)
A-1289 (Momentive)
Z-6940 (Dow)
KBE-846 (Shin-Etsu)
Crosile®69 (Ecopower)
**All tradenames owned by respective brands. No association claimed.
| Property | Value |
|---|---|
| Chemical Name | Bis[3-(triethoxysilyl)propyl]tetrasulfide |
| CAS Number | 40372-72-3 |
| Molecular Formula | C₁₈H₄₂O₆S₄Si₂ |
| Molecular Weight | 538.94 g/mol |
| Appearance | Light yellow to brown liquid |
| Density @ 25°C | ~1.095 g/cm³ |
| Refractive Index @ 20°C | ~1.49 |
| Viscosity @ 25°C | ~11 cSt |
| Flash Point | ~91°C |
| Solubility | Miscible with toluene, alcohols, ketones; immiscible with water |
| Hydrolytic Sensitivity | Reacts slowly with moisture (forms silanols and ethanol) |
| Storage Stability | Stable under dry, sealed storage at ambient temperature (<25°C) |
Enhances tensile strength and modulus of rubber
Improves abrasion resistance and reduces compression set
Lowers rolling resistance in tires, improving fuel efficiency
Acts as a coupling agent between inorganic fillers and organic polymers
Facilitates better dispersion of fillers in rubber compounds
Tire Manufacturing: Improves wet traction and reduces rolling resistance
Footwear Soles: Enhances durability and wear resistance
Mechanical Rubber Goods: Boosts dynamic properties and longevity
Adhesives & Sealants: Serves as an adhesion promoter to various substrates
Typically used at 1.0 to 4.0 parts per hundred rubber (phr), depending on the specific application and formulation requirements.
1 kg, 5 kg, and 25 kg containers
Transportation & Courier Facility: Available across India
Store in a cool, dry place away from moisture
Keep containers tightly closed when not in use
Recommended storage temperature: Below 25°C
Evonik Industries: Silane SI69 Product Information
SinoSi: SiSiB® PC2000 Technical Data
Gelest Inc.: BIS[3-(TRIETHOXYSILYL)PROPYL]TETRASULFIDE Technical Sheet
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