POWERSIL^® 402 A/B

After stirring up, A and B-component both have to be mixed in the ratio 1 : 1 by thorough stirring. At room temperature the pot life is at least 3 days.

Surfaces to be treated should be dry and free of grease, oil and other contaminants. For cleaning chemically pure solvents e. g. acetone can be used. The dispersion of POWERSIL^® 402 A/B can be applied by dipping, spraying and with a brush.

For electrically conductive coatings we recommend a curing - after air drying for approx. 5 min at room temperature - of at least 30 min at 150 °C.

POWERSIL^® 402 A/B can also be used as adhesion primer for overmoulding parts made from conductive silicone rubber with RTV-2/LSR silicone rubbers. For adhesion promoting (e.g. for deflectors) POWERSIL^® 402 A/B should be vulcanized - after air drying for approx. 5 min at room temperature - for 20 min at 140 - 150 °C in a circulating air oven. Casting with a RTV-2/LSR silicone rubber should take place at the latest after 24 h. It appeared that the adhesion after heat vulcanization (e.g. 100 °C) mostly is better than after room temperature curing.

If for the application of POWERSIL^® 402 A/B a higher mixing viscosity is desired a catalyzation of only the A component is possible. After stirring up 0.1 % Catalyst EP is added and stirred thoroughly. By dilution with chemical pure Xylene the desired mixing viscosity (> 500 mPa s) can be adjusted. As a general rule the individual processing conditions must be optimized for the specific application. Various substances can poison the platinum catalyst and delay vulcanization or, in extreme cases, prevent it entirely.

Particularly critical catalyst poisons are: Sulphur, polysulfides, polysulfones and compounds containing sulfphur, such as natural and synthetic rubber. Amines, urethanes and substrates containing amines, such as polyurethanes, epoxy resins etc. Organometallic compounds, especially organo-tin, and substances containing such compounds. Sticky areas are signs of inhibition.


For detailed information, refer to brochures on www.wacker.com.