Tetrasulfide Silane Coupling Agent Crosile® 69 for Rubber

Silane coupling agent Crosile®69 is bifunctional, sulfur-containing organosilane for rubber tyre in combination with white fillers containing silanol groups

Item NO.:
Crosile® 69
Chemical Name:
Bis [3-(triethoxysilyl) propyl] tetrasulfide
Chemical Formula:
C18H42O6S4Si2
CAS No.:
40372-72-3
EINECS No:
254-896-5
Properties:
1. Sulfur containing organosilane modified Silica 2. Greater tensile strength 3. Reduced compression set 4. Increased abrasion resistance 5. Low rolling resistance

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Tetrasulfide Silane Coupling Agent Crosile® 69 for Rubber

Bis-[γ-(triethoxysilyl)-propyl]-tetrasulfide Silane coupling agent for Rubber

Chemical Name

Bis [3-(triethoxysilyl)propyl] tetrasulfide,Silane 69,TESPT

CAS NO.

40372-72-3

Formula

(C2H5O)3SiCH2CH2CH2-S4-CH2CH2CH2Si(OC2H5)3

Formula Structure

Chemical Properties

Silane coupling agent Crosile® 69 Bis[3-(triethoxysilyl)propyl]tetrasulfide (TESPT) is commonly used as a silane coupling agent, crosslinking agent, and reinforcing additive in rubber manufacturing. It improves the interaction between inorganic fillers and rubber polymers, enhancing the mechanical properties and processing performance of rubber compounds.

TESPT is widely used in tire compounds and other technical rubber products. It can also form protective films on metal substrates and serves as an important intermediate in the synthesis of silicon-based materials.

Equivalent Type

Bis(3-triethoxysilylpropyl)tetrasulfane, Bis(3-(ethoxysilyl)propyl)tetrasulfide, Bis(triethoxysilylpropyl)tetrasulfane, Bis[3-(triethoxysilyl)propyl]tetrasulfide, Tetrasulfane, Bis(3-Triethoxysilylpropyl), Silane coupling agent

Specifications

Properties	Units	Target Values (Spec,Limits)
Alcohol content	%(wt)	≤0.5%
CLPTES Content	%(wt)	≤3.0%
Other impurity content	%(wt)	≤1.0%
Viscosity 25°C (cps)	Cps	≤14.0
Sulfur Content	%(wt)	22.5(21.7-23.3)
Average chain Length	3.70(3.55-3.85)
S2 content	% ( wt)	18.0(15.0-21.0)
S3 content	% (wt)	30.0(27.0-33.0)
S4 content	% (wt)	24.0(21.0-27.0)
S5 to S8 content	% ( wt)	27.0(24.0-30.0)
Volatility (100°C /10min.)	%	≤ 1.0%
Specific Gravity (25°C)		1.080 ± 0.020
Refractive Index (25°C)		1.480 ± 0.020

Crosile® 69 (TESPT) Application Guide

1. Designed for silica-filled rubber compounds and tire applications; improves filler-rubber interaction and reinforcement efficiency.

2. Key benefits

Improves tensile strength, tear strength, and abrasion resistance
Reduces compression set
Enhances filler dispersion
Lowers compound viscosity and improves processability
Contributes to improved overall mechanical properties of vulcanizates

3. Recommended systems

Fillers: Silica, talc, mica, kaolin and other hydroxyl-containing minerals
Polymers: NR, IR, SBR, BR, NBR, EPDM and other unsaturated rubbers or their blends

4. Typical dosage: 1.0–4.0 PHR (parts per hundred rubber)

Bis[γ-(triethoxysilyl)propyl]tetrasulfide,Bis-[γ-(triethoxysilyl)-propyl]-tetrasulfide,Silane Coupling Agent Si-69,Silane Coupling Agent A-1289,Silane Coupling Agent KH-858,Bis-[3-(triethoxysilylpropyl)]-tetrasulfide

Si69 Silane coupling Agent (Tespt)