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Chemical name: Gamma-Mercaptopropyltrimethoxysilane 3-trimethoxysilylpropane-1-thiol

CAS Number: 4420-74-0

EINECS Number: 224-588-5

Product Summary

IsoQure® Mercaptomox is a water-white to light straw liquid. It is a mercapto-functional silane that finds use as a coupling agent in polysulfide and polyurethane caulks and sealants. It is especially useful in sulfur-cured and metal oxide-cured elastomers. Chemically bonding reinforcing minerals like silica, clay, mica and talc to the polymer matrix, properties including modulus, tensile and tear strength, heat buildup, abrasion resistance, resilience, compression set and cure time are improved in mineral-filled elastomers.

It can be used as a pretreatment on minerals or added at the time of compounding. Being a rather efficient and fast sulfur containing silane, typically lower silane loading levels are used.

Material Definition

Appearance: Colourless transparent liquid

Molecular Weight: 196.4

Density (25/25°C): 1.051

Boiling Point: 93°C (40 mmHg)

Refractive Index: 1.440 (25°C)

Flash Point: 48°C

Purity: ≤ 95.0%

Solubility: Soluble in methanol, ethanol, isopropanol, mineral spirits, acetone, benzene, toluene, xylene, and in water when suitable hydrolysis procedures are followed.


IsoQure® Mercaptomox shows improved or equal performance in low-rolling resistance silica-reinforced tread compounds that can be achieved at lower silane loading levels when Mercaptomox silane is substituted for commonly used polysulfied-type silanes.

Mineral-reinforced articles such as shoe soles, rubber rollers and wheels, white sidewalls, and wire and cure accelerator systems and increased sulfur-donor concentrations may be necessary when IsoQure® Mercaptomox is substituted for slower cure-rate polysulfide-type silanes.

Handling, Storage and Packaging

The processing and use of IsoQure® Mercaptomox requires adequate technical and professional knowledge. Please consult safety data sheet and observe local safety regulations. The legal requirements prevailing in your country, especially in the avoidance of accidents, working hygiene and patent rights must be observed.

IsoQure® Mercaptomox has to be stored in tightly sealed original containers in a cool and dry place. Properly stored it is stable for minimum one year.

Standard pack size are drums of 200 kg.

Regulatory Information

EU REACH registered: Not applicable


  • Americas (United States, Canada, South America)
  • APAC (Asia-Pacific)
  • ANZ (Australia, New Zealand)
  • EU (European Union)
  • PRC (People's Republic of China)
  • UK (United Kingdom)
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    IsoQure® Mercaptomox
    Product Summary / Data Sheet

    Disclaimer / Conditions

    We strive to be accurate in all of our documentation. However, any information or advice is provided by us in good faith, without warranty or unlimited claim of fitness for a specific application. We sell to qualified industrial users only. The onus is on the product's user to research carefully and then to continually test the product and its application procedures within the context of its specific use. Use of our products and data requires diligance and care, and is within the sole responsibility of the user. Kautschuk-Group does not accept any liability for damages incurred. Our general Terms and Conditions apply.

    Stated storage and shelf life times are minimum guaranteed values for a period starting on the day of shipment. After this period has expired, the product requires additional quality control testing but may very well still be within specification.

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