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
- encapsulation of electronic components for the automotive and power electronics industries
- encapsulation of solar cells
- production of damping elements
- sealing of clean room filters
Only components A and B with the same lot number may be processed together!
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 compatibility.
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.
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 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.
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”.
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.
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.