Bis(triethoxysilylpropyl)tetrasulfide

Bis(triethoxysilylpropyl)tetrasulfide, also known by the CAS 40372-72-3, is a bifunctional organosilane coupling agent used across rubber compounding and polymer processing. It bridges inorganic fillers with organic polymer matrices. This chemical improves the mechanical integration of silica and other mineral fillers into elastomer systems. In tire manufacturing, it is the industry-standard coupling agent for silica-reinforced tread compounds.

The product reduces rolling resistance and improves wet grip performance, which are two critical metrics in fuel-efficient tire formulations. Rubber goods producers use it to enhance tensile strength and abrasion resistance. It is frequently utilized in technical rubber articles such as belts, hoses, and seals. In plastics and polymer compounding, it functions as a surface modifier for mineral fillers, improving dispersion and adhesion.

The agent enhances the filler-matrix interface significantly. Coatings and adhesive formulators also apply this silane where silica or glass substrates require durable chemical bonding to sulfur-crosslinkable polymer systems. The material is supplied as an amber to yellow liquid. It is available in technical grade, which is the standard commercial form for most industrial rubber and polymer applications.

Bulk supply is offered in drums and intermediate bulk containers. Purity specifications are typically confirmed by silane content and sulfur rank distribution to ensure consistent performance in manufacturing.