Si-69 Bis[3-(triethoxysilyl)propyl]tetrasulfide CAS 40372-72-3

Products Description

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Product Description

Si-69 (Bis[3-(triethoxysilyl)propyl] tetrasulfide CAS 40372-72-3) is a sulfur silane supplied worldwide by Guangzhou Epoxysca Material Technology Co., Ltd. It couples silica and other inorganic fillers to rubber during vulcanization, lowering rolling resistance while keeping wet grip and abrasion resistance. It is available in export-grade packaging: a batch COA is provided with every shipment, and English TDS/MSDS can be requested from our sales team. Sea or air shipment is arranged according to the goods class and destination requirements. Typical applications include tire & tread compounds and rubber goods.

Si-69 Sulfur Silane skeletal structure diagram (PubChem) — Si-69 化学结构式:(C₂H₅O)₃Si—(CH₂)₃—S—S—S—S—(CH₂)₃—Si(OC₂H₅)₃(四硫化物桥)

Si-69 Technical Data
Chemical Name	Bis[3-(triethoxysilyl)propyl] tetrasulfide
CAS No.	40372-72-3
Molecular Formula / MW	C₁₈H₄₂O₆S₄Si₂ / 538.94
Appearance	Pale yellow transparent viscous liquid
Total sulfur	≥22.5%
Density(ρ20)	1.090 ± 0.005 g/cm³
Refractive Index(n²⁵D)	1.4800 ± 0.0050
Viscosity(25 ℃)	approx. 12 cSt
Flash Point	>100 ℃
Equivalent grades	Si 69(Evonik/Momentive,Union Carbide

Applications

Tire & tread compounds:Couples silica fillers to rubber, lowering rolling resistance while keeping wet grip and abrasion resistance Contact us for the English TDS and sample support.
Rubber goods:Improves reinforcement and processability of filled rubber compounds Export packing and documents are available for this application.
Silica & filler treatment:Improves dispersion and processing flow of silica and silicate fillers Contact us for the English TDS and sample support.

Usage & Recommended Dosage

Common process routes and dosage references for Si-69 are summarized below. Detailed English process instructions are available on request.

Dosage basis: dosage reference 6%-10%. Process details are provided in the English TDS — contact our technical team.

Two-stage mixing: process details are provided in the English TDS — contact our technical team.

Packaging & Storage

Store sealed in a cool, dry and ventilated place, away from light and moisture. Standard packing: 20 kg carton, 25 kg plastic drum, 200 kg steel drum or IBC. Other packings available on request. Shelf life: 12 months in unopened original packaging.

Frequently Asked Questions

Can you supply Si-69 for export?

Yes. Si-69 (sulfur silane) is supplied worldwide from Guangzhou Epoxysca. Sea freight (FCL/LCL) and air freight are both available; packing and documents follow the hazardous-goods class and destination port requirements.

How can I get the English TDS, MSDS and COA of Si-69?

A batch COA is provided with every shipment. English TDS and MSDS can be requested from our sales team when inquiring; the technical data on this page follows the same specification as the COA.

What is the MOQ and lead time for Si-69?

Both sample-size and full-packing orders are acceptable. Regular lead time is confirmed per order; sea and air schedules can be arranged according to your destination port or airport.

What are the main applications of Si-69?

Tire & tread compounds and Rubber goods are the primary applications. For formulation advice and dosage recommendations, please refer to the usage section or contact our technical team.