WACKER® PRIMER AV A/B
Two-component primer to promote the adhesion between wood or aluminium
and room temperature curing rubber.
Properties
- low solvent content
- straightforward processing
- excellent adhesion
- short drying time
Data sheets
Application
Bonding agent used with RTV-2 silicone rubbers, preferably
addition-curing from, among others, the ELASTOSIL® M and
ELASTOSIL® RT ranges to achieve adhesion to metallic and
non-metallic substrates.
Even silicone rubber formulations modified with large amounts
of silicone fluid, of the kind commonly used for making printing pads,
will develp excellent adhesion to aluminium or plywood carrier plates
when WACKER Primer AV is used.
Processing
Preparing the surface
Surfaces to be primed should be dry and free from grease, oil or other
contaminants. The surface should first be cleaned with a non-polar
solvent such as mineral spirits (at a boiling range of 80°C up to 140°C),
followed by a polar solvent, preferably acetone. Loose particles must be
removed and very smooth surfaces should be roughened by ginding.
Mixing
To obtain a ready to use mixture, the components A and B have to be
mixed in the ratio 2:1.
Due to the low viscosity of the components this may be achieved by a
simple shaking the closed mixing vessel.
The mixture has a pot life of about 8 hours. After that time a proper
adhesion might not be guaranteed.
Therefore it is important only to mix that much amount which is possible
to be processed in that time frame.
Caution!
The mixture of A and B will release hydrogen gas. Therfore it is imperative
never to close the mixing vessel tightly.
Applying the primer
The primer is best applied wilth a brush, although dipping or spraying can
be used. On relatively smooth, non absorbent surfaces such as aluminum
the primer should be applied as thinly as possible and free of air bubbles.
On very rough or absorbent surfaces, such as plywood the coating should be
applied quite liberally.
The reaction time of the primer film is at least 15 minutes at ambient temperature
(relative atmospheric humidity must be at least 40% and should be monitored
using a hygrometer).
The catalyzed silicone rubber should be applied to the primer coat immediately
after the drying process, if possible, but at the latest after 24 hours since
otherwise a drop in adhesive strength may occur.
Processing
Preparing the surface
Surfaces to be primed should be dry and free from grease, oil or other
contaminants. The surface should first be cleaned with a non-polar
solvent such as mineral spirits (at a boiling range of 80°C up to 140°C),
followed by a polar solvent, preferably acetone. Loose particles must be
removed and very smooth surfaces should be roughened by ginding.
Mixing
To obtain a ready to use mixture, the components A and B have to be
mixed in the ratio 2:1.
Due to the low viscosity of the components this may be achieved by a
simple shaking the closed mixing vessel.
The mixture has a pot life of about 8 hours. After that time a proper
adhesion might not be guaranteed.
Therefore it is important only to mix that much amount which is possible
to be processed in that time frame.
Caution!
The mixture of A and B will release hydrogen gas. Therfore it is imperative
never to close the mixing vessel tightly.
Applying the primer
The primer is best applied wilth a brush, although dipping or spraying can
be used. On relatively smooth, non absorbent surfaces such as aluminum
the primer should be applied as thinly as possible and free of air bubbles.
On very rough or absorbent surfaces, such as plywood the coating should be
applied quite liberally.
The reaction time of the primer film is at least 15 minutes at ambient temperature
(relative atmospheric humidity must be at least 40% and should be monitored
using a hygrometer).
The catalyzed silicone rubber should be applied to the primer coat immediately
after the drying process, if possible, but at the latest after 24 hours since
otherwise a drop in adhesive strength may occur.
Storage
Components A and B of Primer AV are best stored between
5°C and 30°C in the tightly closed original container.
The "Best use before end" date of each batch appears 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.
Sales and support
Ann Arbor, MI 48108
United States
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