Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Momentive Silquest A-189 Gamma-Mercaptopropyltrimethoxysilane

Momentive Silquest A-189 is a gamma-mercaptopropyltrimethoxysilane coupling agent from the Silquest series. It enhances adhesion between organic polymers and inorganic substrates like glass, metals, or minerals. Widely used in rubber compounding, sealants, and adhesives, it provides superior sulfur-vulcanizable bonding and moisture-cure functionality via hydrolyzable methoxy groups.
  • momentive silquest a 189 gamma mercaptopropyltrimethoxysilane_e73809b7
  • momentive silquest a 189 gamma mercaptopropyltrimethoxysilane_e73809b7

Features Of Momentive Silquest A-189 Gamma-Mercaptopropyltrimethoxysilane

  1. Reactive thiol (–SH) group enables covalent bonding with metals, sulfur-cured elastomers, and radiation-curable systems.

  2. Three hydrolysable methoxy groups provide strong siloxane network formation and durable adhesion to glass, silica, and metal oxides.

  3. Gamma-positioned mercapto functionality ensures optimal balance between reactivity and hydrolytic stability.

  4. Low volatility and high purity support consistent performance in precision applications such as adhesives and sealants.

  5. Functionally bridges organic polymers and inorganic substrates—enhancing interfacial strength and moisture resistance.

Typical Applications Of Momentive Silquest A-189 Gamma-Mercaptopropyltrimethoxysilane

  1. Tire and rubber compounds—improves silica-reinforced tread adhesion and reduces rolling resistance.

  2. Adhesives and sealants—boosts bond durability on metals, glass, and coated substrates.

  3. Radiation-curable coatings and inks—acts as a thiol-ene crosslinker for rapid, low-shrinkage curing.

  4. Composite materials—enhances fiber-matrix interfacial adhesion in glass- and carbon-fiber reinforced thermosets.

  5. Surface modification of fillers and pigments—improves dispersion and compatibility in polymer matrices.

Specifications Of Momentive Silquest A-189 Gamma-Mercaptopropyltrimethoxysilane

Chemical TypeOrganofunctional silane
Product FormLiquid
AppearanceClear, colorless to pale yellow liquid
Molecular Weight236.4 g/mol
Specific Gravity (25°C)1.05–1.07
Refractive Index (25°C)1.430–1.440
pH (1% aqueous solution)4.0–6.0
Shelf Life (unopened, 25°C)12 months


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