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
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
Lab Line Enterprises, an ISO 9001:2015 certified company, is a trusted supplier, dealer, wholesaler, importer, and manufacturer of SI 619 (Silane Coupling Agent, also known as TESPT, Bis[3-(Triethoxysilyl)propyl] tetrasulfide). Our high-quality SI 619 silane coupling agent is widely used in rubber compounding, tire manufacturing, footwear, conveyor belts, and polymer modification. This coupling agent enhances filler dispersion, improves reinforcement, increases tensile strength, and reduces rolling resistance in green tire technology. Available in ready stock at the best price in India, SI 619 is supplied across all major industrial states including Delhi NCR, Maharashtra, Gujarat, Tamil Nadu, Karnataka, Telangana, Andhra Pradesh, Kerala, Rajasthan, West Bengal, Punjab, Madhya Pradesh, Odisha, and Bihar, with reliable delivery through courier and transport partners. As a leading TESPT SI 619 supplier in India, Lab Line Enterprises ensures consistent quality, technical support, and bulk or small-quantity availability to meet customer requirements.
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