Thanks to the specific reactivity of the 2-aminoethylaminopropyl structure, using GENIOSIL® GF 9 as an adhesion promoter in glass-fiber reinforced or filler-modified plastics reduces the filler's sedimentation tendency and improves dispersibility and numerous mechanical properties (e.g. flexural strength, tensile strength, modulus of elasticity) of the composites. The use of GENIOSIL® GF 9 in these materials also results in a markedly improved resistance to water (vapor) and corrosion. Electrical properties, such as volume resistivity and the dielectric constant, are also positively influenced
Due to the nature of the amino group, this substance reacts as a strong base. The silane hydrolyzes autocatalytically in the presence of moisture (methanol is released) to form silanols, which can subsequently react with themselves to produce siloxanes or can bind to inorganic substrates. t´s a clear, colorless to light yello liquid with a characteristic amine odor. As a typical amine, GENIOSIL® GF 9 can also interact with numerous organic polymers and thus function as a molecular bridge between organic and inorganic substrates.

1. General processing information

GENIOSIL® GF 9 is highly miscible with organic sol-vents, such as ethers and hydrocarbons.
Mixing with ketones results in imine formation, while mixing with alcohols other than methanol leads to an autocatalytic exchange of alkoxy groups until the system reaches thermodynamic equilibrium.
GENIOSIL® GF 9 demonstrates typical amine behavior when exposed to acids, epoxides or isocyanates. GENIOSIL® GF 9 is highly soluble in neutral water.
Caution: due to the enthalpy of solution, mixing GENIOSIL® GF 9 with water is exothermic. It is recommended that GENIOSIL® GF 9 is added to water, not vice versa, while stirring.
A 2 wt % solution of GENIOSIL® GF 9 in water has a pH of 10 -11 and remains stable for several weeks. Due to the reactive nature of GENIOSIL® GF 9, contact with moisture must be avoided during prevent undesired hydrolysis.

2. GENIOSIL® GF 9 in glass-fiber reinforced or mineral-filled polymers

Fillers are treated either with pure GENIOSIL® GF 9 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 amine curing agent.
In an alternative procedure referred to as "blending", GENIOSIL® GF 9 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® GF 9 and the polymer are compatible and that the resin and GENIOSIL® GF 9 do not react prematurely.

3. GENIOSIL® GF 9 as a surface modifier

Used as a primer, GENIOSIL® GF 9 is applied as an aqueous or organic solution to an inorganic substrate (e.g. metal or glass surfaces). Once GENIOSIL® GF 9 has dried and bonded to the surface, an organic coating may be applied using a standard technique (e.g. spraying or knife coating).

GENIOSIL® GF 9 is mainly used as a surface modifier for glass fibers, glass-fiber fabrics, fillers (e.g. glass or mineral wool, mica, talc, wollastonite, kaolin, christobalite, metal oxides) and pigments used in various plastics, including epoxy resins, polyamides, polyacrylates, polyurethanes, ethylene/vinyl acetate copolymers and many others.
Other important applications include its uses as an adhesion promoter in polysulfides and phenolic resins for abrasives and insulating materials and as a primer for sealants, adhesives and coatings.


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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