Tetrasulfide Silane Coupling Agent Crosile® 69 for Rubber
Chemical Name
Bis [3-(triethoxysilyl)propyl] tetrasulfide
CAS NO.
40372-72-3
Formula
(C2H5O)3SiCH2CH2CH2-S4-CH2CH2CH2Si(OC2H5)
Equivalent Name
Bis(3-triethoxysilylpropyl)tetrasulfane, Bis(3-(ethoxysilyl)propyl)tetrasulfide, Bis(triethoxysilylpropyl)tetrasulfane, Bis[3-(triethoxysilyl)propyl]tetrasulfide, Tetrasulfane, Bis(3-Triethoxysilylpropyl), Silane coupling agent, Tetrasulfide silane crosslinking agent 69,TESPT
Chemical Properties
Crosile® 69 (TESPT) is a sulfur-containing bifunctional silane coupling agent widely used in rubber compounds reinforced with silica and other mineral fillers.
It improves the interaction between inorganic fillers and rubber polymers, enhancing filler dispersion, reinforcement efficiency, and processing performance.
Specifications
| Properties | Units | Target Values (Spec,Limits) |
|---|---|---|
| Alcohol content | %(wt) | ≤0.5% |
| CLPTES Content | %(wt) | ≤3.0% |
| Other impurity content | %(wt) | ≤1.0% |
| Viscosity 25°C | Cps | ≤14.0 |
| Sulfur Content | %(wt) | 22.5(21.7-23.3) |
| Average chain Length | 3.70(3.55-3.85) | |
| S2 content | % (wt) | 18.0(15.0-21.0) |
| S3 content | % (wt) | 30.0(27.0-33.0) |
| S4 content | % (wt) | 24.0(21.0-27.0) |
| S5 to S8 content | % (wt) | 27.0(24.0-30.0) |
| Volatility (100°C /10min.) | % | ≤ 1.0% |
| Specific Gravity (25°C) | – | 1.080 ± 0.020 |
| Refractive Index (25°C) | – | 1.480 ± 0.020 |
Application
- Used as a silane coupling agent in silica-reinforced rubber compounds.
- Improves the bonding between fillers and rubber matrices, contributing to enhanced mechanical properties and wear resistance.
- Helps improve filler dispersion and processing performance in rubber formulations.
- Suitable for NR, IR, SBR, BR, NBR, and EPDM compounds.
- Commonly used in tire compounds, industrial rubber products, footwear, conveyor belts, and other rubber applications.
Bis[γ-(triethoxysilyl)propyl]tetrasulfide, Bis-[γ-(triethoxysilyl)-propyl]-tetrasulfide, Silane Coupling Agent Crosile-69, Bis-[3-(triethoxysilylpropyl)]-tetrasulfide
Packaging And Transportation
Packing:
- 25 kg /drum (16 MT/20 FCL with pallet)
- 200 kg /drum (16 MT/20 FCL with pallet)
- 1060 kg in IBC drum (21.2 MT/20 FCL with pallet)
Storage:
Kept in low temperature, dry and ventilated place avoiding direct sunlight.
Shelf life:
One year in ventilating, cool and dry area.
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