CG-Si69 (CAS No. 40372-72-3)

No. CG-Si69 silane coupling agent is bis[3-(triethoxysilyl)propyl]tetrasulfide. It is also named as bis - [γ-(triethoxysilyl) propyl] tetrasulfide. Its molecular formula is C18H42O6Si2S4, and structural formula is

Physical Properties of Bis[3-(triethoxysilyl)propyl]tetrasulfide

1. CAS No. : 40372-72-3
2. Molecular Weight: 539
3. Physical Form: Transparent liquid
4. Color: Yellow or light yellow
5. Total Sulfur: 21.7%-23.3%
6. Average Sulfur Chain Length: 3.55-3.82
7. CLPTES Content: ≤ 3.0%
8. EtOH Content: ≤ 0.5%
9. Impurities Before: ≤ 1.0 %
10. Specific Gravity at 20°C: 1.060-1.10
11. Refractive Index (nD, 25°C): 1.460-1.50
12. Chroma: < 6
13. Viscosity (cPa.s): ≤ 14


Bis[3-(triethoxysilyl)propyl]tetrasulfide has multiple functional groups. It is successfully applied in rubber industry. This product is used to improve modulus and tensile strength of rubber, to reduce compound viscosity and save process energy consumption. This silane coupling agent is especially applicable for polymers with double bond or rubber formulation with hydroxyl fillers. The suitable fillers are silica, silicate and clay, etc. Bis[3-(triethoxysilyl)propyl]tetrasulfide is suitable for many kinds of rubbers such as natural rubber (NR), butadiene styrene rubber (SBR), isoprene rubber (IR), butadiene rubber (BR), acrylonitrile butadiene rubber (NBR) and ethylene propylene diene rubber (EPDM), etc.

Packaging and Storage

Bis[3-(triethoxysilyl)propyl]tetrasulfide is packed in 25KG/200KG drum, IBC or ISO tank.
This product is sealed and stored in cool and well ventilated place away from fire and water.


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