Besides the application of GENIOSIL® GF 98 as an adhesion promoter in formulations and primers, it is also used as a coupling agent for modifying fillers and pigments to enhance dispersibility in organic binders and plastics, and thereby improve mechanical properties (flexural strength, tensile strength, modulus etc.).
GENIOSIL® GF 98 is an alkoxysilane with an amino-functional group. It´s a clear, colorless to light yellowish liquid with a characteristically aromatic odor. The compound reacts with moisture under hydrolysis of the alkoxy groups and forms silanols, which reacts further forming siloxanes. As a bifunctional amine, GENIOSIL® GF 98 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 98 is very readily soluble in alcohols, esters and ketones. It is only slightly soluble in n-hexane. It may react slowly with ketones and aldehydes to form imines. With other alcohols excepting methanol, an autocatalytic exchange reaction forms mixed alkoxysilane bonds. In neutral water GENIOSIL® GF 98 reacts under hydrolysis and condensation of the silanol groups. The water has an approximate pH of 9 - 10.

2. GENIOSIL® GF 98 as an Adhesion Promoter in Formulations

In silane crosslinking formulations GENIOSIL® GF 98 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.

3. GENIOSIL® GF 98 as a surface modifier

Fillers are treated either with pure GENIOSIL® GF 98 or a solution thereof. It may be necessary to pretreat the substrate with water.
In an alternative procedure referred to as "blending", GENIOSIL® GF 98 is added directly to the polymer - either before the organic materials is compounded with the filler or at the same time.
However, this is only possible if the polymer is compatible with GENIOSIL® GF 98.

Important applications of GENIOSIL® GF 98 is the use as an adhesion promoter in sealants, adhesives and coatings, and as a coupling agent for inorganic particles, pigments or fillers.


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.

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

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