WACKER SilGel® 616 A/B

WACKER SilGel® 616 A/B is a pourable, addition-curing, two-component silicone rubber that vulcanizes at room temperature. WACKER SilGel® 616 A/B cures to a very soft, gel-like vulcanizate.


All surfaces must be clean and free of contaminants that will inhibit the cure of WACKER SilGel® 616 A/B. Examples of inhibiting contaminants are sulfur containing materials, plasticizers, urethanes, amine containing materials and organometallic compounds – especially organotin compounds. If a substrate’s ability to inhibit cure is unknown, a small scale test should be run to determine compatibility.

Caution: Only components A and B with the same lot number may be processed together!

Component B of WACKER SilGel® 616 contains the platinum catalyst, component A the crosslinker. Even traces of the platinum catalyst may cause gelling of the component containing the crosslinker. Therefore tools (spatula, stirrers, etc.) used for handling the platinum-containing component or the catalyzed compound must not come into contact with this component. The two components should be thoroughly mixed at a 1 : 1 ratio by weight or volume. To eliminate any air introduced during dispensing or trapped under components or devices a vacuum de-airing under a vacuum encapsulation is recommended.

The curing time is highly dependent on temperature, size and heat sink properties of the component being potted.

If the gel is too soft and tacky, reducing the amount of component B will result in a harder, less tacky vulcanizate. The hardest formulation is achieved with a mixing ratio for A : B of roughly 1.5 : 1. Tack-free surfaces can be achieved by coating with ELASTOSIL® RT 601.

We recommend running preliminary tests to optimize conditions for the particular application.

Comprehensive processing instructions are given in our leaflet "Wacker RTV-2 Silicone Rubber- Processing".

WACKER SilGel® 616 A/B can be pigmented by adding 1 - 4 % of an ELASTOSIL ® FL pigment paste.

The reactivity can be adjusted within wide limits by adding Catalyst EP or Inhibitor PT 88 to suit the processing requirements of the particular application. Catalyst EP increases the reactivity, i. e., pot life and curing time are reduced. Inhibitor PT 88 is a pot life extender and prolongs pot life and curing time. Further information is given in our leaflet “Catalyst EP/Inhibitor PT88”.

We recommend running preliminary tests to optimize conditions for the particular application.

Comprehensive processing instructions are given in our leaflet "Wacker RTV-2 Silicone Rubber-Processing".

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Wacker Chemie AG
Heilbronner Strasse 74
70191 Stuttgart
Deutschland
+49  711  61942-0 (Phone)
+49 711 61942-61  (Fax)
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