Crosile® Sulfur and Mercapto Silane Coupling Agents for Rubber

Organosilanes containing sulfur in rubber are a type of organosilicon compound, which contain both sulfur and silicon elements in their molecules, typically with a structure similar to that of silanes. These compounds can be used as adhesives, lubricants, antioxidants, and anti-corrosion agents.

Item NO.:
Sulfur Silane
Chemical Name:
Sulfur Silane Coupling Agent Crosile
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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Crosile® Sulfur and Mercapto Silane Coupling Agents for Rubber

Sulfur- and mercapto-functional silane coupling agents for silica-reinforced rubber and tire compounds.

Product Description

Ecopower New Material (ECOPOWER) supplies Crosile® sulfur- and mercapto-functional silane coupling agents for silica-reinforced rubber compounds, tire formulations and other mineral-filled elastomer systems.

The product range includes tetrasulfide, disulfide, thiocyanate-type, monosulfide and mercapto-functional silanes, together with liquid, solid and carbon-black-predispersed grades. These products are designed for rubber and tire manufacturers seeking improved filler dispersion, rubber–filler interaction, reinforcement, processing efficiency and selected low-VOC solutions.

Crosile® sulfur and mercapto silane coupling agents are used in passenger-car tires, truck and bus tires, shoe soles, hoses, belts, cables and other industrial rubber products. Selected mercapto-functional grades are also used for mineral filler modification, sealants, adhesives, coatings and metal–resin adhesion applications.

The comparison table below helps rubber and tire manufacturers, compounders and procurement teams review the ECOPOWER portfolio by chemical type, sulfur structure, physical form, CAS number, common market reference grade, key features and typical applications.

ECOPOWER Sulfur and Mercapto Silane Coupling Agent Comparison

ECOPOWER Grade	Chemical Name / Type	CAS No.	Physical Form / Product Form	Common Market Reference Grade	Key Features and Main Applications
Crosile®-69	Bis-[3-(triethoxysilyl)propyl] tetrasulfide, TESPT	40372-72-3	Liquid	Si 69	Standard sulfur silane for silica-reinforced rubber compounds. Used in tire treads, shoe soles, hoses and belts. Helps improve tensile strength, tear strength and abrasion resistance while helping reduce heat build-up.
Crosile®-69C	TESPT with carbon black, predispersed granule	Product-specific	Solid granule	X 50-S	Convenient solid form with low dust, good flowability and easy weighing. Suitable for automated dosing and rubber-compounding operations.
Crosile®-75	Bis-[3-(triethoxysilyl)propyl] disulfide, TESPD	56706-10-6	Liquid	Si 75	Disulfide silane with a shorter sulfur chain than TESPT. Supports improved scorch safety and a wider mixing and processing window.
Crosile®-75C	TESPD with carbon black, predispersed granule	Product-specific	Solid granule	X 75-S	Solid predispersed form of the Crosile®-75 type. Supports clean handling, accurate dosing and efficient use in rubber and tire production.
Crosile®-264	3-Thiocyanatopropyltriethoxysilane	34708-08-2	Liquid	Si 264	Helps improve filler dispersion, abrasion resistance and resilience. Used in shoe soles, belts and other rubber goods.
Crosile®-965	Long-chain polyether mercaptosilane, oligomeric monosulfide silane	Product-specific	Liquid	Si 363	Low-volatility monosulfide silane for high-silica rubber compounds. Supports improved filler dispersion and may enable simplified mixing processes.
Crosile®-966	3-Octanoylthiopropyltriethoxysilane, thioester type	220727-26-4	Liquid	Si 291 / NXT	Designed for high-silica passenger-car tire tread compounds. Supports low rolling resistance, wet-grip balance and lower volatile emissions.
Crosile®-969	Low-VOC sulfur silane, improved tetrasulfide type	Product-specific	Liquid	Product-specific	Low-VOC option for selected rubber formulations. May be used as an alternative to conventional TESPT-type products, subject to formulation and process qualification.
Crosile®-996	Disulfide disilatrane	Product-specific	Liquid	Si 466	Silatrane structure designed to reduce ethanol release during mixing. May reduce or eliminate the need for DPG activator in suitable formulations.
Crosile®-189	3-Mercaptopropyltrimethoxysilane, MPTMS	4420-74-0	Liquid	MPTMS	Used for metal-surface treatment, corrosion protection, filler modification and metal–resin adhesion promotion.
Crosile®-1891	3-Mercaptopropyltriethoxysilane, MPTES	14814-09-6	Liquid	MPTES	Suitable for sulfur- and metal-oxide-cured rubber systems, mineral filler modification, sealants and adhesives.
Crosile®-970	3-Mercaptopropylmethyldimethoxysilane, MPMDMS	31001-77-1	Liquid	MPMDMS	Provides good compatibility with mineral-filled elastomer systems. Suitable for rubber, cable and other mineral-filled applications.

Reference-Grade Disclaimer: Third-party product and grade names are provided only for general chemical-type and market identification purposes. They do not indicate affiliation, licensing, endorsement or guaranteed one-to-one equivalence. Final product suitability should be confirmed through the customer's own formulation, processing and performance evaluation.

How to Select a Crosile® Grade

The appropriate sulfur or mercapto silane depends on the compound design, filler system, processing conditions and required performance.

For standard silica-reinforced tire and rubber compounds: consider a TESPT-type grade such as Crosile®-69.
For improved scorch safety and a wider mixing window: consider a TESPD-type grade such as Crosile®-75.
For solid handling, low dust and automated dosing: consider Crosile®-69C or Crosile®-75C.
For high-silica tire tread compounds and low rolling resistance: consider selected low-volatility or thioester-type grades such as Crosile®-965 or Crosile®-966.
For low-VOC processing requirements: consider Crosile®-969 or Crosile®-996, subject to formulation qualification.
For mineral-filled elastomers, cables, sealants and adhesion promotion: consider mercapto-functional grades such as Crosile®-189, Crosile®-1891 or Crosile®-970.

For product-specific technical data, packaging, samples or commercial supply information, please contact ECOPOWER.

Sulfur Silane Coupling Agent Application Advantages

Chemical Bridging and Molecular Mechanism

The alkoxysilane groups react with hydroxyl groups on silica and other inorganic filler surfaces, while the sulfur- or mercapto-functional groups interact with the elastomer or curing system. This helps build a stronger interface between mineral fillers and rubber polymers.

Improved Filler Dispersion and Reinforcement

Crosile® sulfur silanes can improve filler dispersion and reinforcing efficiency, supporting higher tensile strength, tear resistance, abrasion resistance and overall compound performance.

Processing and Mixing Efficiency

Depending on the selected grade and formulation, sulfur silanes can help reduce compound viscosity, improve filler incorporation, support more efficient mixing and provide a suitable processing window for rubber manufacturing.

Selection Flexibility

The Crosile® range includes:

Liquid sulfur silanes;
Solid predispersed grades;
Tetrasulfide and disulfide silanes;
Thiocyanate-type and monosulfide silanes;
Thioester-type products;
Low-VOC sulfur silanes;
Mercapto-functional silanes.

This range allows rubber and tire manufacturers to select a product according to their compound design, equipment, dosing method, VOC requirements and target performance.

Broad Rubber and Filler Compatibility

Selected grades are suitable for compounds based on NR, SBR, BR, NBR, EPDM and related elastomer systems. Depending on the product and formulation, they can be used with silica, carbon black and other mineral fillers such as clay, talc and mica.

Main Applications

Passenger-car tire tread compounds;
Truck and bus tire compounds;
Silica-reinforced rubber;
Shoe soles;
Hoses and belts;
Industrial rubber goods;
Cables;
Mineral-filled elastomers;
Sealants and adhesives;
Metal-surface treatment;
Metal–resin adhesion promotion;
Rubber and composite materials.

Availability and B2B Supply Support

Packaging: Crosile® sulfur and mercapto silane coupling agents are available in commercial packaging, including 200 kg steel drums and 1,000 kg IBCs, subject to the specific product grade and supply arrangement.

ECOPOWER supports B2B customers with:

Product selection assistance;
Technical data sheets;
Samples for formulation and process qualification;
Packaging and logistics coordination;
Product documentation;
Customized technical communication;
Long-term commercial supply discussions.

Product-specific purity, packaging and regulatory information should be confirmed in the applicable technical documentation.

Summary

Ecopower New Material (ECOPOWER) offers a broad range of Crosile® sulfur- and mercapto-functional silane coupling agents for rubber, tire and mineral-filled elastomer applications. The portfolio includes conventional TESPT and TESPD grades, solid predispersed products, specialty low-VOC silanes and mercapto-functional silanes.

By comparing chemical type, sulfur structure, physical form, application and processing characteristics, rubber and tire manufacturers can identify suitable grades for production qualification and commercial sourcing.

Contact ECOPOWER to request technical data, samples, product recommendations or a quotation for sulfur and mercapto silane coupling agents.

Product information should be confirmed against the latest applicable technical data sheet, specification sheet and commercial documentation before publication or customer use.

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