CG-Si75 (CAS No. 56706-10-6)

Chemical name of our CG-Si75 silane coupling agent is bis(triethoxysilylpropyl) disulfide. Its synonym is bis[γ-(triethoxysilyl) propyl] disulfide. Molecular formula of this product is C18H42O6S2Si2 and its structural formula is as below.

Physical Properties of Bis(triethoxysilylpropyl) disulfide

1. CAS No. : 56706-10-6(Si-75)
2. Physical Form: Transparent liquid
3. Color: Light yellow
4. Molecular Weight: 474.82
5. Total Sulfur Content: 13.5%-15.5%
6. Average Sulfur Chain Length: 2.2-2.5
7. Impurities Content (%): ≤ 3.0
8. Specific Gravity at 20°C: 1.020-1.060
9. Refractive Index (nD 25°C): 1.440-1.480
10. Chlorides, ppm : ≤ 0.4
11. Chroma: <5
12. Viscosity (cPa.s): ≤ 14


1. Bis(triethoxysilylpropyl) disulfide has multiple functional groups. It is successfully used in the rubber industry. This product is used for improving modulus and tensile strength of rubber, reducing compound viscosity and saving process energy consumption.
2. Compared with Si69, the low-active disulfide group of Si75 is more reliable and provides more scorch safety.
3. Bis(triethoxysilylpropyl) disulfide is especially suitable for polymers with double bond or rubber formulation with hydroxyl fillers. The suitable fillers include silica, silicate and clay, etc. The suitable rubber include 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(triethoxysilylpropyl) disulfide is usually packed in 25KG/200KG drum, IBC or ISO tank.
It is sealed and stored in cool and well ventilated place away from fire and water.


The information provided herein was believed by Jiangxi Chenguang New Materials Co., Ltd. to be accurate at the time of preparation or prepared from sources believed to be reliable, but it is the responsibility of the user to investigate and understand other pertinent sources of information, to comply with all laws and procedures applicable to the safe handling and use of the product, and to determine the suitability of the product for user's intended application or use. All products supplied by Chenguang are subject to Chenguang's standard terms and conditions of sale. CHENGUANG MAKES NO WARRANTY, EXPRESS OR IMPLIED, CONCERNING THE PRODUCT OR THE MERCHANTABILITY OR FITNESS THEREOF FOR ANY PURPOSE OR CONCERNING THE ACCURACY OF ANY INFORMATION PROVIDED BY CHENGUANG, except that the product shall conform to Chenguang’s specifications. Nothing contained herein constitutes an offer for the sale of any product.

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