WACKER SilGel® 612 A/B

WACKER SilGel® 612 A/B is a pourable, addition-curing, RTV-2 silicone rubber that vulcanizes at room temperature to a very soft silicone gel.


  • two-part, 1 : 1 mixing ratio
  • low viscosity
  • rapid heat cure
  • very low hardness (silicone gel)
  • crystal clear
  • pronounced inherent tack
  • flame retardant, UL listed 94HB

All surfaces must be clean and free of contaminants
that will inhibit the cure of WACKER SilGel® 612 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

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

Component B of WACKER SilGel® 612 A/B contains
the platinum catalyst, component A the crosslinker.
Even traces of the platinum catalyst may cause gelling
of the component containing the crosslinker.

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 encapsulation
is recommended.

Curing time of addition curing silicone rubber 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 approximately 1.5 : 1.

For logistical reasons we can only accept orders in a mixing ratio of A : B = 1 : 1.

Tack-free surfaces can be achieved by coating with ELASTOSIL® RT 601.

WACKER SilGel® 612 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 ELASTOSIL® Catalyst EP or Inhibitor PT 88 to suit the processing requirements of the particular application. ELASTOSIL® 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 “ELASTOSIL®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".


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.

Vertrieb & Support

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

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