EN CN
  • Contact us

    Qingdao Hengda New Material Technology Co., Ltd.

    ADD

    Qingdao International Innovation Park, Qingdao, Shandong Province, China

  • MARKETING AND SALES DEPARTMENT

    MANUFACTURING PLANTS

    Gaizhou Hengda Chemicals Co., Ltd.

    Shandong Hengda Silicon Material Technology Co., Ltd.

HENGDA-Si69 - Bis[3-(triethoxysilyl)propyl]tetrasulfide

HENGDA-Si69

Bis[3-(triethoxysilyl)propyl]tetrasulfide is a chemical compound with the molecular formula (C₂H₅O)₃Si(CH₂)₃SSS(CH₂)₃Si(OC₂H₅)₃. It is commonly referred to as "TESPT" or "TESPTES" in shorthand. This compound is used as a sulfur-containing silane coupling agent in the rubber industry, particularly in the production of tires and other rubber products. Its function is to improve the bonding between rubber and inorganic fillers or reinforcements, thereby enhancing the mechanical properties and durability of the rubber compounds.

  • Chemical Name:

    Bis[3-(triethoxysilyl)propyl]tetrasulfide

  • CAS No.

    40372-72-3

  • Equivalent Name:

    A-1289

Typical Properties

Appearance

Slightly yellow transparent liquid

Density(ρ20), g/cm³

1.060~1.100

Molecular Weight

538.95

Refractive Index(nD²⁰)

1.4600~1.5000

Applications

1.HENGDA-Si69 is a multifunctional additive that has been successfully applied in the silicone rubber and tire industry. It is to increase the elastic modulus and tensile strength of rubber, significantly improve the wear resistance and compression performance of rubber, reduce the viscosity of rubber, and save processing energy consumption. 

2.HENGDA-Si69 is suitable for rubber formulations that use hydroxyl fillers in double bond-containing polymers or their blends. 

3.Applicable fillers include silica, silicate, chalk, etc.; applicable rubbers include natural rubber (NR), styrene-butadiene rubber (SBR), isoprene rubber (IR), butadiene rubber (BR), nitrile Rubber (NBR) and ethylene propylene diene monomer (EPDM), etc.


Packing

20kg, 200kg plastic or iron drum, IBC drum

HENGDA-Si69