$GENIOSIL<sup>®</sup> APTE



GENIOSIL® APTE is a clear, colorless liquid with a characteristic amine odor.

  • CAS No. 919-30-2
  • Empirical formula C9H23NO3Si
  • Molecular weight 221,37


GENIOSIL® APTE is an alkoxysilane with an amino-functional group. It´s a clear, colorless liquid with a characteristic amine odor. Due to the nature of the amino group, this substance reacts as a strong base. The silane hydrolyzes autocatalytically in the presence of moisture (ethanol is released) to form silanols, which can subsequently react with themselves to produce siloxanes or can bind to inorganic substrates. As a typical amine, GENIOSIL® APTE can also interact with numerous organic polymers and thus function as a molecular bridge between organic and inorganic substrates.

In addition to its application as an adhesion promoter in formulations and primers, GENIOSIL® APTE functions as a surface modifier for fillers and pigments, where it improves the dispersibility of the filler and the mechanical properties - such as flexural strength, tensile strength and modulus - of the composites. The silane also reduces the filler's sedimentation tendency in the uncured polymer. GENIOSIL® APTE also greatly increases water (vapor) and corrosion resistance.

1. General processing information:

GENIOSIL® APTE is highly miscible with standard organic solvents such as ethers and hydrocarbons.

Mixing with ketones results in imine formation, while mixing with alcohols other than ethanol leads to an autocatalytic exchange of alkoxy groups until the system reaches thermodynamic equilibrium.

GENIOSIL® APTE shows typical amine behavior when exposed to acids, epoxides or isocyanates.

GENIOSIL® APTE is highly soluble in neutral water and undergoes hydrolysis.

Caution: due to the enthalpy of solution, mixing GENIOSIL® APTE with water is exothermic. A solution of GENIOSIL® APTE in water has a pH of 10 - 11 and remains stable for several weeks. Due to the highly reactive nature of GENIOSIL® APTE, contact with moisture must be avoided during processing to prevent undesired hydrolysis.


2. GENIOSIL® APTE as a surface modifier:

Fillers are treated either with pure GENIOSIL® APTE or a solution thereof. It may be necessary to pretreat the substrate with water. The modified filler is preferably bonded to the organic material, e.g. an epoxy resin, by mixing it with a standard curing agent.

In an alternative procedure referred to as "blending", GENIOSIL® APTE is added directly to the polymer - either before the organic materials is compounded with the filler or at the same time.

A prerequisite for the blending process is that GENIOSIL® APTE and the polymer are compatible and that the resin and GENIOSIL® APTE do not react prematurely.


3. GENIOSIL® APTE as an adhesion promoter in formulations:

In silane crosslinking formulations (e.g. silane-terminated polyethers or polyurethanes and polysiloxanes), GENIOSIL® APTE may be added to the formulation as an adhesion promoter. Processing is effected by means of standard mixing methods. Usually, about 1 - 2 wt % silane is added to the formulation.


Information on available container sizes is obtainable from WACKER subsidiaries.


The 'Best use before end' date of each batch is shown on the product label. Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.

Sales and support

Wacker Chemical Corporation
3301 Sutton Road
Adrian, MI 49221-9397
United States
+1  888  922-5374 (Phone)

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Brenntag North America
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812021 South Plainfield
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