Material description
Silicon E is a pourable, condensation-curing two- component
silicone rubber vulcanising at room temperature. It has a
excelent flowability with good self-deaeration and a medium
Shore A hardness after curing. The cured rubber Silicon E
has good dielectric properties.
Application
Encapsulation of electrical and electronic components.
Also suitable for making flexible moulds or as flexible
mould release agent.
Processing
Before the rubber base is taken from the drum or mixed
with the catalyst, it must be stirred thoroughly, preferably
using a mechanical stirrer, in order to redisperse any filler
which may have settled.
For processing Silicon E the hardener must be filled in the
rubber base and both components must be mixed with
constant stirring.
The mixture should be poured in a thin stream from close
as possible. The point of contact should not be varied once
selected. The silicone rubber will thus fill all voids and
expel air. The resultant vulcanisates are bubble-free.
Condensation-curing silicone rubbers requires catalytical
amounts of humidity for proper cure. If the containers are
not stored tightly closed, or are even left open, the water
added during the production may evaporate, resulting in
markedly prolonged pot lifes as well as curing problems,
such as adherence of rubber to the surface.
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In this case, the water content of the air must be increased
by appropriate measures, e.g. evaporators or atomisers, to
at least 40% relative humidity. Water should not be added
to the rubber base.
As encapsulating material Silicon E is a condensationcuring
silicone rubber, it will achieve its full operability
only after the volatile reaction products (low-molecolar
alcohols) formed during vulcanisation have been
removed.
The potted components must not be exposed to
temperatures exceeding 90°C until the alcohol formed
during cure has fully escaped from the vulcanisate.
Vulcanisates that are absolutely free from alcohol are
obtained by storing them exposed to the air for a period
of, depending on layer thickness, 48 - 72 hours at ambient
temperature or by heating them in awell ventilated oven
at 70°C maximum for approx. 6 hours/cm layer thickness.
Storage
The original closed tins have to be stored in a dry and
frost-free place. Open units must be used at once.
The processing-guarantee is 12 months after production
date (see labels on the containers).
Hazardous / Safety advice
Follow the advice printed on the containers and the
relevant safety data sheets for resin and hardener. |
